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Heat kills more Americans than hurricanes, tornadoes, and floods combined. Over 1,200 people die from extreme heat every year in the United States, and that number keeps climbing. The brutal part? Most of those deaths happen indoors, often to people who simply did not have air conditioning or did not realize how dangerous the situation had become.

Heat domes are no longer freak events. They are becoming a regular feature of summer, parking over entire regions for days or weeks at a time, pushing temperatures past 100 degrees and overwhelming power grids right when you need them most. And here is the thing that catches people off guard: it is not just the temperature that kills. It is the combination of heat and humidity that makes it physically impossible for your body to cool itself.

This heat wave emergency preparedness guide for 2026 covers everything you need to protect your family before, during, and after extreme heat. You will learn exactly how to recognize heat illness before it becomes life-threatening, how to cool your home room by room even without AC, what to stockpile for a 72-hour heat emergency, and which cooling gear actually works when the power grid fails. The information here could genuinely save a life this summer. Possibly yours.

1,200+
Heat deaths per year in the US
90°F
FEMA extreme heat threshold
95°F
Unsurvivable wet bulb temp
80%
Heat deaths occur indoors

Key Takeaways

  • Heat is the deadliest weather event in America, killing over 1,200 people annually, most of them indoors
  • Heat exhaustion is a warning you can treat at home. Heat stroke is a 911 emergency with a narrow window to act
  • Humidity matters as much as temperature. A 90-degree day at high humidity can feel like 105+ on the heat index
  • A room-by-room cooling strategy using blackout curtains, window film, and battery fans can drop indoor temps 10-15 degrees
  • Your 72-hour heat wave kit should focus on hydration and cooling, not warmth. One gallon of water per person per day minimum
  • Power grid failures during heat waves compound the danger. Battery-powered cooling gear is not optional, it is survival equipment
  • Elderly adults, children under 4, outdoor workers, and people on certain medications face the highest risk

Why Heat Waves Are More Dangerous Than You Think

Most people underestimate heat. A tornado gives you a visual warning. A hurricane gets named and tracked on live TV for days. But heat? Heat just slowly cooks you while you sit on your couch thinking it is just a hot day. That gap between perception and reality is exactly where heat deaths happen.

The science behind deadly heat

Your body cools itself primarily through sweating. When sweat evaporates off your skin, it carries heat with it. This system works beautifully in dry heat. It fails catastrophically in humid heat. When the air is already saturated with moisture, your sweat cannot evaporate. It just sits on your skin, doing nothing. Your core temperature rises. Your organs start to struggle. And if the wet bulb temperature (a measurement that combines heat and humidity) crosses 95 degrees Fahrenheit, the human body physically cannot cool itself. Period. Not in shade. Not with unlimited water. Not if you are a 25-year-old athlete in peak condition. That is a hard biological limit.

The National Weather Service uses a Heat Index to communicate this danger. At low humidity, 90 degrees feels like 90 degrees. But at high humidity, that same 90 degrees can feel like 105 or more. And that perceived temperature is what your body is actually dealing with.

Heat domes are the new normal

A heat dome is a high-pressure system that parks over a region and traps hot air underneath it like a lid on a pot. Temperatures spike. Wind dies. The air stagnates. And because the dome blocks weather systems from moving through, it can last days or even weeks. The Pacific Northwest heat dome of 2021 killed hundreds of people in a region where most homes did not even have air conditioning. These events used to be rare. They are now becoming a regular feature of summer across the US, Canada, and Europe.

Power grid failures make everything worse

Here is the cruel irony of heat waves: everyone turns on their AC at the same time, and the power grid buckles under the load. Rolling blackouts hit. And suddenly, the people who were counting on air conditioning to survive are sitting in dark, sealed homes that are rapidly heating up. During the 2023 heat wave in Texas, ERCOT came within minutes of complete grid failure. When the grid goes down during a heat wave, you need a backup plan that does not require electricity from the wall. That is not paranoia. That is basic preparedness. If you have a home battery or EV with vehicle-to-home capability, you have a significant advantage when the grid drops.

Critical to understand: Heat does not announce itself the way other emergencies do. There is no siren. There is no visible damage. People die from heat because they do not take it seriously until their body is already in crisis. If the heat index is above 105, treat it like the emergency it is.

Heat Exhaustion vs. Heat Stroke: Know the Difference

The single most important thing you can learn from this article is how to tell the difference between heat exhaustion and heat stroke. One is a warning. The other is an emergency. Getting this wrong costs lives every year.

Symptom Heat Exhaustion Heat Stroke
Sweating Heavy sweating Sweating STOPS
Skin Cool, clammy, pale Hot, red, dry
Body temperature Below 104°F 104°F or higher
Pulse Fast and weak Fast and strong
Mental state Dizzy, nauseous Confused, may lose consciousness
Other symptoms Muscle cramps, headache, fatigue Vomiting, seizures, slurred speech
Severity Warning stage Life-threatening emergency
Action required Cool down, hydrate, rest Call 911 immediately

How to treat heat exhaustion

Heat exhaustion is your body waving a red flag. The cooling system is overwhelmed but still working. You have a window to fix this before it escalates.

1

Move to a cool environment immediately

Get the person indoors with AC, or at minimum into shade with airflow. Every minute in the heat makes the situation worse. A car with AC running works in a pinch.

2

Cool the body actively

Remove excess clothing. Apply cold wet towels to the neck, armpits, and groin, where major blood vessels run close to the surface. Fan the person to increase evaporation. If available, a cool (not ice cold) shower or bath is highly effective.

3

Hydrate slowly

Sip cool water or an electrolyte drink mix. Small, frequent sips. Do not chug a liter at once because that can cause nausea and vomiting, which makes dehydration worse. Avoid caffeine and alcohol, both of which accelerate fluid loss.

4

Monitor closely for 30 minutes

If symptoms improve within 30 minutes, the person is recovering. Continue resting in a cool place and hydrating. If symptoms do not improve, or if they get worse at any point, call 911. Heat exhaustion can escalate to heat stroke faster than you expect.

How to respond to heat stroke

Heat stroke means the body's cooling system has completely failed. Core temperature is at or above 104 degrees Fahrenheit. Organs are taking damage. The brain is being affected. This is not a "wait and see" situation.

Call 911 first. Then cool the person by any means available. Immerse them in cold water if possible. Pack ice around the neck, armpits, and groin. Spray with cool water and fan aggressively. Do NOT give fluids by mouth because an altered mental state creates choking risk. Every minute without cooling increases the chance of permanent brain damage or death. Do not wait for the ambulance to start cooling.
Worth knowing: The transition from heat exhaustion to heat stroke can happen in minutes. The most dangerous sign is when someone who has been sweating heavily suddenly stops sweating. That is the moment the body's cooling system has failed. Act immediately.

Who Is Most Vulnerable During Extreme Heat

Heat does not affect everyone equally. Some people are at dramatically higher risk, and knowing who is most vulnerable in your household or neighborhood could save a life.

Adults over 65

Aging reduces the body's ability to regulate temperature. Sweat glands become less efficient. The sense of thirst weakens, so older adults often do not drink enough water even when dehydrated. Many also take medications that interfere with the body's cooling response. If you have elderly parents, grandparents, or neighbors, check on them multiple times per day during a heat wave. A phone call is good. A physical visit is better. Do not assume they will ask for help.

Children under 4

Young children generate more metabolic heat relative to their body size and cannot regulate temperature as effectively as adults. They also depend entirely on caregivers to keep them cool and hydrated. They will not tell you they are overheating until symptoms are advanced. Never leave a child in a parked car, even for a minute. Interior car temperatures can reach 130 degrees in less than 30 minutes, even with windows cracked.

People on certain medications

Several common medication categories affect heat tolerance. Diuretics (water pills) accelerate fluid loss. Beta blockers reduce blood flow to the skin. Some psychiatric medications, including antipsychotics and certain antidepressants, impair sweating. Stimulants like ADHD medications increase metabolic heat. If you or a family member takes any of these, talk to your doctor about heat precautions before summer hits. Do not stop medications without medical guidance, but do plan extra cooling and hydration.

Outdoor workers

Construction workers, landscapers, agricultural workers, delivery drivers, and anyone whose job keeps them outside during peak heat hours face enormous risk. OSHA recommends the "water, rest, shade" protocol: drink water every 15 minutes, take breaks in shade, and gradually acclimatize to hot conditions over 7-14 days. If your job keeps you outdoors, a portable neck fan and cooling towels are not luxury items. They are safety equipment.

People without air conditioning

This is the biggest single risk factor. Most heat deaths happen indoors, in homes without AC or where the AC has failed. If you do not have air conditioning, this guide is especially for you. The room-by-room cooling strategy below can drop indoor temperatures by 10-15 degrees using relatively inexpensive tools. And knowing where your nearest cooling center is located could save your life.

People who live alone

The dangerous thing about heat illness is that it affects your judgment before it affects your body. Confusion and disorientation are early symptoms of heat stroke. A person living alone may not recognize they are in trouble and may not be able to call for help. If you live alone, set up a buddy system with a neighbor or friend to check in on each other during heat waves. Have a plan documented in your family emergency communication plan.

Room-by-Room Cooling Strategy (Even Without AC)

If your air conditioning fails, is not powerful enough, or you simply do not have it, you need a plan B. The goal is not to make your entire house comfortable. It is to make one or two rooms survivable. Focus your efforts where they matter most.

The "cool room" concept

Pick one room in your home and turn it into a dedicated cooling zone. Ideally, this is a room on the lowest floor (heat rises), with the fewest windows (less solar heat gain), and the smallest square footage (easier to cool). A basement is ideal. An interior bedroom on the ground floor works well. Avoid upper floors and rooms with large west-facing windows.

Living room and common areas

1

Block solar heat at the windows

Thermal blackout curtains are the single most effective thing you can install. They block up to 99% of sunlight and can reduce room temperature by 5-10 degrees on their own. Close them on all sun-facing windows by mid-morning before the heat builds. For extra protection, apply heat-blocking window film to south and west-facing windows. The film works 24/7, even when curtains are open.

2

Create cross-ventilation at night

During the day, keep all windows and doors closed to lock cool air in. After sunset, when outdoor temperatures drop below indoor temperatures, open windows on opposite sides of the house to create a cross-breeze. Place a fan in the window on the cooler side of the house (usually north or east) blowing inward, and open a window on the opposite side for hot air to escape.

3

Reduce internal heat sources

Every appliance generates heat. During a heat wave, stop using the oven and stove. Eat cold meals, sandwiches, salads, and no-cook foods. Avoid running the dishwasher and dryer during the day. Switch incandescent light bulbs to LEDs (incandescents convert 90% of energy to heat). Unplug electronics you are not using. These small changes add up fast in a closed environment.

Bedroom cooling for sleep

Sleeping in extreme heat is genuinely difficult and dangerous. Your body temperature naturally dips at night, and when the environment prevents that dip, sleep quality collapses and heat stress accumulates overnight.

4

Set up your sleep zone strategically

Move your mattress to the coolest room in the house, even if that means sleeping in the living room or basement. Sleep on the lowest floor possible. Use lightweight cotton or bamboo sheets only. A rechargeable battery fan positioned to blow directly across your body is essential. Point it at your upper body and head for maximum comfort.

5

Use the damp sheet method

Soak a bedsheet or towel in cool water, wring it out so it is damp but not dripping, and use it as your top sheet. As air moves over the damp fabric, evaporation pulls heat away from your body. Combine this with a fan and the cooling effect is significant. You can also freeze a water bottle and place it near your feet or between your knees. The evaporative cooling towels designed for athletes work the same way and stay cool for hours.

Kitchen strategy

6

Go no-cook during peak heat

Running an oven at 400 degrees raises the temperature of your kitchen by 5-10 degrees and that heat spreads through your home. During a heat wave, switch entirely to cold meals: salads, sandwiches, wraps, fruit, nuts, yogurt, canned tuna, hummus. If you must cook, use a microwave (generates minimal heat) or cook outside on a grill. Keep the kitchen door closed if you have one. Pre-make meals during cooler nighttime hours if needed.

Bathroom cooling hack

7

Use cool water strategically

Run cold water over your wrists, the back of your neck, and your feet. These areas have blood vessels close to the surface and cool the blood circulating through your body. A cool bath or shower every few hours is one of the most effective cooling methods available. Even filling a basin with cool water and soaking your feet while you sit reduces core temperature noticeably. For kids, fill the bathtub with a few inches of cool water for supervised play during the hottest afternoon hours.

Pro tip: Hang a damp towel or wet sheet in a doorway with a fan blowing through it. The air passes through the wet fabric and comes out several degrees cooler. This is essentially how a swamp cooler works, and it costs nothing. It is most effective in drier climates. In high humidity, stick to direct body cooling methods.

72-Hour Heat Wave Emergency Supply Checklist

A heat wave emergency kit is different from a standard disaster kit. The focus shifts from warmth and shelter to hydration and cooling. If the power goes out during a 100+ degree day, you need these items ready to go, not sitting in an Amazon cart.

Hydration supplies

Water and Fluids

  • 1 gallon of water per person per day, minimum 3-day supply (a family of 4 needs 12 gallons)
  • Electrolyte drink mix (at least 12 packets per person for 3 days)
  • Insulated water bottles for each family member to keep water cool longer
  • Backup water purification method (filter or purification tablets) in case tap water is disrupted
  • Freeze several water bottles in advance to serve as both ice packs and drinking water as they melt

Dehydration is the number one killer during heat waves. You need to drink before you feel thirsty because by the time thirst kicks in, you are already dehydrated. Plain water works, but your body also loses sodium, potassium, and magnesium through sweat. An electrolyte mix replaces what water alone cannot. Skip sugary sports drinks and go with a proper electrolyte formula with minimal sugar.

Cooling equipment

Cooling Gear

Information and communication

Information and Safety

  • NOAA weather radio (battery or hand crank, does not depend on cell towers or internet)
  • Portable phone charger or power bank (fully charged before the heat wave hits)
  • List of local cooling center locations and hours
  • Printed list of emergency contacts (phone batteries die when you need them most)
  • First aid kit with a thermometer that reads up to at least 108 degrees Fahrenheit
  • 7-day supply of all prescription medications
  • Updated family emergency communication plan

Food for a heat emergency

No-Cook Food Supply

  • Canned fruits and vegetables (high water content helps hydration)
  • Canned tuna, chicken, and beans (protein without cooking)
  • Crackers, granola bars, trail mix, and nuts
  • Peanut butter (calorie-dense, no refrigeration needed)
  • Dried fruit (compact, shelf-stable, energy-dense)
  • Manual can opener (electric ones are useless in a power outage)
  • Paper plates and plastic utensils (no dishwasher, no hot water for washing)
Worth knowing: Assemble your heat wave kit before summer. Stores sell out of fans and cooling gear within hours of a heat wave announcement. Prices spike on Amazon when demand surges. Buy this stuff in April or May when it is cheap and available. The $50 you spend now on a battery fan could be worth your life in July.

Best Cooling Gear for Heat Wave Emergencies

Not all cooling products are created equal. Here is what actually works, what to look for, and honest assessments including the downsides. Every product here was chosen because it works without grid power, which is the scenario where you need it most.

Portable Air Conditioner

8,000-14,000 BTU | Single room cooling | Requires window exhaust venting

A portable AC unit is the gold standard for room-level cooling. Unlike a window unit, you can move it between rooms and store it when not in use. For heat wave prep, a single portable AC in your designated cool room can keep temperatures livable even when it is 110 outside. Look for units rated at 10,000+ BTU for rooms up to 450 square feet.

Pros

  • True air conditioning, not just air movement
  • Can cool a room by 15-25 degrees
  • Portable between rooms
  • Many models include dehumidifier function
  • No permanent installation required

Cons

  • Requires electricity (useless in a blackout without a generator or battery)
  • Needs a window for the exhaust hose
  • Louder than central AC
  • Higher energy consumption than fans

We recommend a portable AC as your primary cooling solution if you have power. Pair it with a home battery backup for blackout resilience. If you rely solely on battery or solar power, the fan options below are more practical for sustained use.

Rechargeable Battery Fan

Multiple speed settings | 8-48 hour runtime | USB rechargeable

This is arguably the most important single item in your heat wave kit. When the power goes out, a rechargeable battery fan keeps air moving across your skin, which is the most basic form of cooling available. The best models run for 24-48 hours on a single charge at low speed, giving you multiple nights of sleep support during a blackout. Look for models with a clip mount so you can attach it to a headboard, desk, or tent pole.

Pros

  • Works without grid power for 24-48 hours
  • Lightweight and portable
  • USB rechargeable from car, solar panel, or power bank
  • Quiet enough for sleeping
  • Affordable (most under $30)

Cons

  • Does not actually lower air temperature
  • Effectiveness drops in very high humidity
  • Smaller airflow than full-size fans

We recommend owning at least two rechargeable battery fans: one for the main living area and one for your sleeping zone. At under $30 each, this is the highest-impact, lowest-cost investment you can make for heat wave preparedness.

Portable Neck Fan

Hands-free design | 6-12 hour runtime | Bladeless safety

A wearable neck fan keeps cool air flowing across your neck and face, where your body is most sensitive to heat. It is perfect for outdoor workers, parents chasing kids around, or anyone who needs to stay mobile during a heat wave. The bladeless design means it is safe around children and will not catch hair.

Pros

  • Hands-free cooling while moving
  • Lightweight (most under 10 ounces)
  • Quiet operation
  • USB rechargeable
  • Safe bladeless design

Cons

  • Shorter battery life than tabletop fans (6-12 hours)
  • Limited airflow compared to larger fans
  • Can feel warm on the neck if worn for hours

We recommend a portable neck fan as a supplement to your tabletop battery fan, not a replacement. It is best for outdoor errands, walking to a cooling center, or managing kids during the day when you need both hands free.

Evaporative Cooling Towels

Instant cooling | 2-3 hour duration per soak | Reusable hundreds of times

These specialized towels are made from hyper-evaporative material. Soak one in water, wring it out, and snap it a few times. It drops to 15-30 degrees below ambient temperature through rapid evaporation. Drape it around your neck, over your head, or across your forehead. When it dries out, re-soak and repeat. Zero electricity required. Zero batteries. Just water.

Pros

  • No electricity or batteries needed
  • Instant cooling effect
  • Reusable hundreds of times
  • Extremely packable and lightweight
  • Very affordable (under $15 for multi-packs)

Cons

  • Needs re-soaking every 2-3 hours
  • Less effective in very high humidity
  • Requires access to water

We recommend cooling towels for every member of your household. They are the cheapest, simplest, most reliable cooling tool available. No batteries to die. No moving parts to break. Just physics doing its job. Buy a multi-pack and keep them in your emergency kit.

Thermal Blackout Curtains

Blocks 99% of light | Reduces heat transfer 25-35% | Multiple colors and sizes

Thermal blackout curtains have a specialized backing that blocks sunlight and insulates against heat transfer through windows. Windows are the biggest source of heat gain in most homes. A south or west-facing window in direct sun can raise room temperature by 10-20 degrees. Blocking that solar heat at the window is far more effective than trying to cool the room after the heat is already inside.

Pros

  • Reduces room temperature 5-10 degrees passively
  • Zero energy use
  • Also reduces energy bills when AC is running
  • Blocks light for better sleep
  • One-time purchase that lasts years

Cons

  • Darkens the room significantly (that is the point)
  • Must be installed before the heat wave
  • Does not help with heat already inside the home

We recommend thermal blackout curtains on every south and west-facing window. This is the highest-ROI passive cooling investment you can make. Install them now, before summer. They reduce heat gain whether the power is on or off, which makes them the foundation of any no-AC cooling strategy.

Heat-Blocking Window Film

UV rejection 99% | Heat reduction up to 78% | Transparent or tinted options

Window film is a thin, adhesive layer you apply directly to the glass. It rejects UV rays and infrared heat while still allowing visible light through. Unlike curtains, it works even when you want natural light in the room. The best films reject up to 78% of solar heat. Once applied, it is invisible and maintenance-free.

Pros

  • Blocks heat while allowing natural light
  • Works 24/7 without adjustment
  • Reduces UV damage to furniture and floors
  • Nearly invisible once installed
  • Affordable (under $30 for most windows)

Cons

  • Requires careful installation to avoid bubbles
  • May void window warranties in rare cases
  • Slightly reduces visible light

We recommend combining window film with blackout curtains for maximum protection. Film provides baseline heat rejection all day, and closing the curtains during peak sun hours adds an extra layer. Together, they can reduce solar heat gain by over 80%.

NOAA Weather Radio

AM/FM/NOAA bands | Hand crank + solar + battery | Built-in flashlight and phone charger

When the power is out and cell towers are overloaded, a NOAA weather radio is your lifeline to critical information. It broadcasts official National Weather Service alerts including excessive heat warnings, cooling center locations, and emergency instructions. The best models have hand crank and solar charging so they never run out of power. Many also include a USB port to emergency-charge your phone.

Pros

  • Works without grid power or cell service
  • Receives official government weather alerts
  • Hand crank charging means it never dies
  • Built-in flashlight and phone charger
  • Under $30 for quality models

Cons

  • Audio-only information (no visual maps)
  • Some areas have weak NOAA signal
  • Hand crank charging is slow

We recommend an emergency radio for every household, not just for heat waves but for any emergency. It is one of those items that costs almost nothing, takes up no space, and becomes invaluable the moment you actually need it.

Cooling gear comparison at a glance

Product Price Range Power Source Best For
Portable AC $250-500 Wall outlet Max cooling with power
Battery Fan $15-35 USB rechargeable Blackout-proof sleeping
Neck Fan $15-30 USB rechargeable Outdoor mobility
Cooling Towels $8-15 Water only Zero-tech reliability
Blackout Curtains $20-50/panel Passive Preventive heat blocking
Window Film $15-30/window Passive Always-on UV and heat rejection
Electrolyte Mix $15-25 N/A Preventing dehydration
Emergency Radio $20-35 Hand crank/solar Grid-down information

Before, During, and After: Your Heat Wave Action Plan

Preparation is what separates people who survive heat waves comfortably from people who end up in emergency rooms. Here is a timeline for exactly what to do at each stage.

Before the heat wave (48-72 hours out)

1

Check your cooling equipment now

Test your AC. Change the filter if it has not been changed in 3+ months. A dirty filter reduces airflow by 15-25%, which means your AC works harder, uses more electricity, and cools less effectively. If you rely on fans, make sure batteries are fully charged. If you use a portable AC, confirm the exhaust hose is properly sealed in the window. Do not wait until it is 105 degrees to discover your AC is broken.

2

Stock up on water and electrolytes

One gallon per person per day, minimum three days. If you have a family of four, that is 12 gallons. Also stock electrolyte mix, frozen water bottles, and no-cook food. Freeze as many water bottles as your freezer can hold. They serve double duty as ice packs now and drinking water later as they melt.

3

Identify your cool room and cooling centers

Decide which room in your home will be your designated cooling zone. Pre-install blackout curtains and window film if you have not already. Look up your city's cooling center locations and hours. Libraries, community centers, and malls often serve as unofficial cooling centers. Know how to get there if you need to evacuate your home.

4

Set up a check-in system

Identify every vulnerable person in your network: elderly neighbors, people who live alone, anyone without AC. Assign someone to check on each person at least twice daily during the heat wave. A quick phone call takes two minutes and can save a life. Document this in your emergency communication plan.

During the heat wave

5

Hydrate on a schedule, not by thirst

Drink at least one glass of water every 20-30 minutes during active hours. Do not wait until you are thirsty. Thirst is a late indicator of dehydration. Add electrolytes to at least two of your daily water portions to replace what you lose through sweat. Avoid alcohol and caffeine, both of which accelerate dehydration. Monitor urine color: pale yellow means you are hydrated, dark yellow means drink immediately.

6

Stay indoors during peak hours

The hottest part of the day is typically between 10 AM and 6 PM, with peak temperatures around 3-5 PM. Schedule any outdoor activity for early morning (before 9 AM) or evening (after 7 PM). If you must go outside during peak hours, wear lightweight, light-colored, loose-fitting clothing. Apply sunscreen. Bring water and a cooling towel. Take breaks in shade every 15 minutes.

7

Monitor yourself and others constantly

Check on vulnerable family members and neighbors at least twice daily. Watch for early signs of heat exhaustion: heavy sweating, cool clammy skin, muscle cramps, dizziness, headache. If you see these symptoms in anyone, act immediately using the heat exhaustion treatment steps earlier in this guide. Do not wait to see if it gets worse. It will.

8

If the power goes out

Switch to battery-powered cooling immediately. Move everyone to the coolest room. Use battery fans, cooling towels, and the damp sheet method. Open windows only if outdoor air is cooler than indoor air. Turn on your NOAA weather radio for updates on power restoration and cooling center locations. If indoor temperature becomes unbearable and there is no sign of power returning, go to a cooling center. Do not stay in a dangerously hot home out of stubbornness.

After the heat wave

9

Do not drop your guard immediately

Heat-related illness can develop or worsen for 24-48 hours after exposure. Continue hydrating aggressively for at least two days after the heat breaks. Watch for delayed symptoms in elderly family members. Recharge all battery-powered devices and replenish your water supply for the next event, because there will be a next event.

10

Debrief and improve your plan

What worked? What did you wish you had? Did the cool room stay cool enough? Did the battery fans last through the night? Write it down while it is fresh. Upgrade your gear and plan before the next heat wave. Preparedness is an iterative process. Each event teaches you something if you pay attention.

How to Check on Vulnerable People

The people most at risk during heat waves are often the least likely to ask for help. Elderly adults may not want to be a burden. People living alone may not realize they are in danger. Outdoor workers may feel pressure to keep working. Your awareness could be the thing that saves them.

What to look for during a check-in

Warning Signs

  • Confusion or disorientation
  • Slurred or slow speech
  • Skin that is hot, red, and dry
  • Person says they feel fine but looks flushed
  • Not drinking water or eating
  • AC is off or set too high to save on electricity
  • Windows closed with no ventilation
  • Wearing heavy or dark clothing indoors

Good Signs

  • Coherent and alert conversation
  • Drinking water regularly
  • Home feels cool or at least ventilated
  • Person knows where cooling centers are
  • Has a working fan or AC
  • Wearing lightweight clothing
  • Has food that does not require cooking
  • Has a phone and knows emergency numbers

If you check on someone and they show warning signs, do not just tell them to drink water and leave. Stay with them until they cool down. Help them to a cooler area. If you cannot get them cool or they show signs of heat stroke (confusion, no sweating, body temperature above 104), call 911. Trust your gut. If something feels wrong, it probably is.

Protecting Your Pets During Extreme Heat

Your pets are counting on you to keep them alive during a heat wave. Dogs and cats cannot sweat effectively. Dogs cool primarily by panting, which becomes less effective as humidity rises. Cats seek cool surfaces but have limited cooling ability beyond that.

Essential pet heat safety rules

Cooling Centers: Your Lifeline When Home Is Not Enough

If your home becomes dangerously hot and you cannot cool it down, a cooling center might be the most important destination you know about. Most cities open designated cooling centers when the National Weather Service issues an excessive heat warning.

What are cooling centers?

Cooling centers are air-conditioned public spaces designated by local government for people to escape dangerous heat. They are typically set up in community centers, libraries, recreation centers, and senior centers. Most are free to enter and do not require registration. Some provide water and snacks. They are specifically designed for people without adequate cooling at home.

How to find cooling centers near you

Know the locations before you need them. Map the route from your home. Identify transportation options. If you rely on public transit, confirm that buses and trains are running, as service can be disrupted during extreme heat events. Have a backup plan for getting there if your car does not start or if you do not have one.

Pro tip: If you are uncomfortable going to a designated cooling center, remember that any air-conditioned public space works. Movie theaters, grocery stores, big box retailers, coffee shops, and hotel lobbies are all legitimate options. Even spending 2-3 hours in AC during the peak afternoon heat can be enough to prevent heat-related illness.

Long-Term Home Upgrades That Pay for Themselves

The gear and strategies above handle the emergency. But if you live in a region where extreme heat is becoming the norm, there are home improvements that reduce your vulnerability year after year.

Window upgrades

After blackout curtains and window film, consider low-E (low emissivity) replacement windows if yours are old single-pane. Low-E glass has a microscopic metallic coating that reflects infrared heat while allowing visible light through. The upfront cost is significant, but they reduce cooling costs by 25-50% and pay for themselves within 5-10 years in most climates.

Attic insulation and ventilation

Your attic can reach 150 degrees on a hot day, and that heat radiates down into your living space. Adding or upgrading attic insulation is one of the most cost-effective home improvements for heat management. Adequate insulation combined with proper attic ventilation (ridge vents, soffit vents, or an attic fan) can reduce your second-floor temperature by 10+ degrees.

Strategic landscaping

Shade trees on the south and west sides of your home can reduce cooling costs by 25-40%. A mature tree blocks solar radiation before it ever hits your roof or walls. Deciduous trees are ideal because they provide shade in summer and drop their leaves in winter to let sunlight through when you want the warmth. This is a long-term investment (trees take years to mature), but it is also free once established and increases your property value.

Whole-house fan

A whole-house fan mounts in your attic and pulls cool evening air through your home while exhausting hot attic air outside. It uses a fraction of the energy of air conditioning and can cool your home rapidly in the evening hours. It is most effective in climates where nighttime temperatures drop below 75-80 degrees. In areas with consistently hot nights, it is less useful.

Solar and battery backup

If grid failure during heat waves is a real risk in your area, a solar panel system with battery storage gives you cooling independence. Even a modest system can keep a portable AC and fans running through a multi-day outage. The federal tax credits available for home energy upgrades make the economics more favorable than ever. A home battery does not just protect against heat wave blackouts. It protects against any power outage, any time of year.

Build Your Family Emergency Plan

Heat waves are just one scenario. A complete family emergency communication plan covers heat, storms, power outages, and more. Make sure everyone in your household knows the plan before they need it.

Read the Emergency Communication Guide
Read: Summer Power Outage Survival

Frequently Asked Questions

FEMA defines extreme heat as temperatures above 90 degrees Fahrenheit with high humidity sustained for two to three days. However, danger depends on humidity as much as temperature. A dry 100 degrees can feel manageable, while 90 degrees at high humidity can push the heat index above 105, which is genuinely dangerous. The real threshold is the wet bulb temperature. Above 95 degrees Fahrenheit wet bulb, the human body cannot cool itself through sweating, even in shade with unlimited water. Pay attention to the heat index, not just the thermometer.

Heat exhaustion is the warning stage: heavy sweating, cool clammy skin, fast weak pulse, nausea, and dizziness. The body is still trying to cool itself. Move to a cool place, hydrate, and apply cool cloths. Heat stroke is the emergency: sweating stops, skin becomes hot and red, pulse is fast and strong, body temperature hits 103+ degrees. The cooling system has failed. Call 911 immediately. Every minute without treatment increases the risk of organ damage or death.

Focus on one or two rooms and make them your cooling zones. Hang thermal blackout curtains or apply heat-blocking window film on south and west-facing windows. Close all windows during the day and open them at night when temperatures drop. Use a rechargeable battery fan pointed at a bowl of ice for a DIY cold air effect. Hang damp towels in doorways for evaporative cooling. Stay on the lowest floor. Avoid using the oven, stove, or dryer. If nothing works, go to a cooling center during peak afternoon hours.

Adults over 65 are at highest risk because the body becomes less efficient at temperature regulation with age. Children under 4 cannot regulate body heat well. People taking diuretics, beta blockers, or certain psychiatric medications face increased risk because these drugs affect sweating and blood flow. Outdoor workers, people without air conditioning, and those with chronic conditions like heart disease face elevated danger. People who live alone are especially at risk because there is nobody to recognize warning signs.

At minimum: one gallon of water per person per day for three days, electrolyte drink mix, a rechargeable battery fan, cooling towels, a battery or hand-crank NOAA weather radio, a first aid kit with a thermometer, non-perishable no-cook foods, seven days of prescription medications, a portable phone charger, and thermal blackout curtains already installed. The key difference from other emergency kits is the focus on hydration and cooling rather than warmth.