How to Stay Safe in Extreme Heat: Home Emergency Guide

Heat kills more Americans than any other weather event. More than hurricanes. More than tornadoes. More than floods. In 2023 alone, over 2,300 people in the United States died from heat-related causes — and summer 2026 is projected to break records again. The most unsettling part? Most heat deaths do not happen outdoors. They happen at home. In bedrooms without AC. In apartments where windows do not open properly. In houses where someone did not realize they were overheating until it was too late.

This is not a guide to scare you. This is a guide to prepare you. Because extreme heat is predictable, and the steps that keep you safe are straightforward. Whether you have central air conditioning or no AC at all, whether you live alone or have a household full of kids and pets, this guide covers exactly what to do before, during, and after a heat wave. Knowledge is the difference between a rough week and a dangerous one. You are about to have the knowledge.

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Why Extreme Heat Is the Deadliest Weather Event

People prepare for hurricanes. They evacuate before floods. They take shelter during tornadoes. But heat? Most people underestimate it. They think opening a window is enough. They think they would notice if they were overheating. They think heat only kills people who work outside in the sun. All of these assumptions are wrong, and they are part of why heat is so deadly.

Extreme heat kills more people in the United States each year than every other weather event combined. The CDC estimates that heat-related illness sends over 67,000 Americans to the emergency room annually. The true death toll is likely higher than official numbers suggest, because heat is often listed as a contributing factor rather than the primary cause on death certificates. When someone with heart disease dies during a heat wave, it is the heat that pushed their body past its limit — but the death certificate might list cardiac arrest.

The danger is increasing. Global temperatures are rising, heat waves are lasting longer, and nights are not cooling down the way they used to. Urban areas are particularly affected by the heat island effect — concrete, asphalt, and buildings absorb and radiate heat, making cities 5 to 10 degrees hotter than surrounding rural areas. If you live in a city apartment without AC, you are in one of the highest-risk environments during a heat wave.

The good news is that heat-related death is almost entirely preventable. Every person who dies from heat exposure could have survived with the right preparation, the right response, and the right knowledge. That is what this guide gives you.

Know the Signs: Heat Exhaustion vs. Heat Stroke

This is the most important section of this entire guide. The difference between heat exhaustion and heat stroke is the difference between a recoverable situation and a life-threatening emergency. Learn these signs. Print this table and put it on your fridge during heat season.

Who Is Most at Risk

Extreme heat is dangerous for everyone, but certain groups face significantly higher risk. If you or someone in your household falls into any of these categories, you need to be extra vigilant during heat waves.

• Adults over 65: Aging reduces the body's ability to regulate temperature. Older adults are less likely to feel thirsty, more likely to have chronic conditions that worsen in heat, and more likely to take medications that affect heat tolerance. They account for the largest share of heat-related deaths.
• Children under 4: Young children cannot regulate body temperature as effectively as adults. They depend entirely on caregivers to keep them hydrated and cool. Their smaller bodies heat up 3 to 5 times faster than an adult's.
• People with chronic illness: Heart disease, diabetes, kidney disease, respiratory conditions, and obesity all increase vulnerability to heat. Many medications — including diuretics, beta-blockers, and antihistamines — impair the body's heat response.
• People without AC: This is the single biggest risk factor for heat death at home. If your home cannot maintain a safe temperature, you need an exit plan — a cooling center, a friend's house, a library, a mall. Anywhere with air conditioning.
• People who live alone: When someone lives alone and begins experiencing heat exhaustion, there is no one to notice the warning signs or call for help. If you live alone, arrange daily check-in calls with a friend or neighbor during heat waves.
• Outdoor workers: Anyone working outside during extreme heat faces direct exposure. Frequent breaks, shade, and aggressive hydration are non-negotiable.

Before the Heat Wave: How to Prepare Your Home

The time to prepare for extreme heat is before it arrives. A few hours of preparation can make the difference between a manageable week and a dangerous one. Here is your pre-heat-wave checklist.

Stock water — more than you think you need

The general rule during extreme heat is one gallon of water per person per day, minimum. A family of four needs at least 4 gallons per day. For a 5-day heat wave, that is 20 gallons. Stock more if you have pets, if anyone in your household exercises, or if you might lose water pressure during a power outage. Fill extra containers, freeze water bottles (they double as ice packs and cold drinking water as they melt), and make sure you have enough before the heat hits.

Seal your home against heat

Heat enters your home through windows, doors, and poor insulation. Before a heat wave, close and seal all windows and doors on the sun-facing side of your home during the day. Apply reflective window film or hang light-colored curtains to block solar heat gain. Use draft stoppers or rolled towels under doors. If you have an attic, make sure it is ventilated — a hot attic radiates heat down into your living space. The goal is to keep the hot air outside and the cooler air inside for as long as possible.

Service your AC — or plan for life without it

If you have AC, test it before the heat wave arrives. Clean or replace filters. Make sure the outdoor unit is clear of debris. A failing AC unit during peak heat is not just uncomfortable — it is dangerous. If you do not have AC, identify your backup plan now. Locate the nearest cooling center (call 211 or check your local government website), ask friends or family if you can visit during peak hours, and know where your nearest library or mall is. Having a plan before you need it eliminates dangerous decision-making under stress.

Prepare your food situation

Cooking heats up your home. Stock up on foods that require no cooking or minimal preparation — fruits, vegetables, sandwiches, salads, canned goods. If you do cook, use an outdoor grill or microwave instead of the stove or oven. Know how to keep food cold if you lose power — this is a real possibility during heat waves when the electrical grid is under maximum stress.

Charge your devices and prepare for power outages

Heat waves push electrical grids to their limits. Rolling blackouts and power outages are common during extreme heat events. Charge all phones, tablets, and battery packs fully. If you have a portable power station, charge it to 100%. Fill your bathtub with water (for flushing toilets if water pressure drops). Have a battery-powered or hand-crank radio available for emergency updates.

During Extreme Heat: The Survival Rules

When the heat wave hits, these rules keep you safe. They are simple, but following them consistently is what separates a rough week from a trip to the emergency room.

Hydrate before you feel thirsty

Thirst is a lagging indicator. By the time you feel thirsty, you are already mildly dehydrated. During extreme heat, drink water on a schedule — at least one cup every 15 to 20 minutes if you are active, or one glass every hour if you are resting indoors. Set a timer on your phone if you need to. Do not rely on your body to tell you when it needs water. It will tell you too late.

Stay indoors during peak hours

The hottest and most dangerous period is typically 10 AM to 6 PM. If you must go outside during these hours, limit your exposure to 15-minute intervals and return to shade or AC immediately after. Schedule any outdoor activities for early morning (before 9 AM) or evening (after 7 PM). This is not the week to mow the lawn, run errands on foot, or exercise outdoors.

Use water to cool your body

Your body cools itself through evaporation. Help it out. Take cool (not ice-cold) showers multiple times per day. Apply wet towels or cooling towels to your neck, wrists, and forehead — these are pulse points where blood vessels are close to the skin surface. Fill a spray bottle with cold water and mist yourself regularly. Soak your feet in a basin of cool water. Every degree you can lower your skin temperature helps your core temperature stay safe.

Dress for survival, not style

Wear loose-fitting, lightweight, light-colored clothing. Cotton and linen breathe better than synthetic fabrics. Avoid dark colors, which absorb heat. If you go outside, wear a wide-brimmed hat and sunglasses. Sunburn impairs your body's ability to cool itself, so apply sunscreen generously to any exposed skin.

Never leave children or pets in a parked car

This deserves its own line because it kills people every single year. A car's interior can reach 120 degrees F within minutes, even with windows cracked, even on a day that does not feel dangerously hot outside. On a 90-degree day, a car's interior hits 109 degrees in 10 minutes and 119 degrees in 20 minutes. Children's bodies heat up 3 to 5 times faster than adults. There is no safe amount of time to leave a child or pet in a parked car during warm weather. Not two minutes. Not with the windows down. Not ever.

Cooling Your Home Without AC

Roughly 10% of US households do not have air conditioning. Many more have window units that cannot keep up with extreme heat. If you are cooling your home without AC, these methods can bring indoor temperatures down by 10 to 20 degrees.

Cross-ventilation

Open windows on opposite sides of your home to create a natural draft. This works best at night and early morning when outdoor air is cooler than indoor air. During the day, if outdoor temperatures exceed indoor temperatures, close everything up — you are trying to keep the cooler air inside. Use fans to amplify the cross-draft. Position one fan blowing inward on the shaded side and another blowing outward on the sunny side.

The ice fan trick

Place a large bowl of ice or frozen water bottles directly in front of a fan. As the fan blows air over the ice, it creates a cool breeze that can drop the temperature in a small room by several degrees. This is a simple, effective DIY air conditioner that works with supplies you already have. A portable misting fan works on the same principle and is easier to position where you need it.

The wet sheet method

Hang a wet sheet over an open window or doorway. As air passes through the damp fabric, evaporation cools it. This is an ancient cooling technique that still works. For maximum effect, use a cotton sheet and keep it damp with a spray bottle. You can also sleep under a damp sheet — the evaporative cooling will help you stay comfortable enough to sleep.

Strategic shade and heat blocking

Close all blinds, curtains, and shutters on windows that face the sun. Up to 30% of unwanted heat enters your home through windows. Reflective window film, aluminum foil taped to windows (reflective side out), or even light-colored cardboard can block significant solar heat gain. If you have outdoor space, hang a tarp or shade cloth over windows that get direct sun.

Go where the AC is

There is no shame in spending the hottest hours of the day somewhere with air conditioning. Libraries, shopping malls, community centers, movie theaters, and many public buildings serve as de facto cooling centers during heat waves. Many cities open official cooling centers during extreme heat events — call 211 to find yours. Spending just a few hours in AC during the hottest part of the day gives your body critical recovery time.

What to Drink and Eat During Extreme Heat

What you put in your body during a heat wave matters more than you might think. The right choices keep you hydrated and help your body regulate temperature. The wrong choices accelerate dehydration and increase your risk.

Drink this

• Water: The foundation. Drink it constantly, even when you are not thirsty. Room temperature water is absorbed faster than ice-cold water, though cold water feels better.
• Electrolyte drinks: When you sweat heavily, you lose sodium, potassium, and other minerals that water alone does not replace. Electrolyte powder packets added to water help maintain the mineral balance your body needs to function. This is especially important if you are sweating for extended periods.
• Coconut water: A natural source of electrolytes with no added sugar. Good alternative if you prefer whole-food options.

Avoid this

• Alcohol: Alcohol is a diuretic — it makes you urinate more, which accelerates dehydration. Even one beer during extreme heat can measurably impair your body's ability to regulate temperature. Save it for after the heat wave passes.
• Caffeine in excess: A morning coffee is fine. But pounding energy drinks or multiple cups of coffee dehydrates you. If you normally drink coffee, match every cup with an equal amount of water.
• Sugary drinks: Sodas and fruit juices with high sugar content can slow water absorption and provide empty calories that generate metabolic heat.

Eat light, eat cold, eat wet

Heavy meals generate metabolic heat as your body digests them. During extreme heat, eat smaller, lighter meals more frequently. Focus on foods with high water content: watermelon (92% water), cucumbers (96% water), strawberries (91% water), oranges (87% water), and lettuce (95% water). Salads, cold soups like gazpacho, smoothies, and fruit bowls are ideal heat wave meals. Avoid heavy proteins, fried foods, and anything that requires running your oven for an hour.

First Aid for Heat Emergencies

If someone near you shows signs of a heat emergency, your response in the first few minutes determines the outcome. Here is exactly what to do.

For heat exhaustion

1. Move them to a cool place immediately. Indoors with AC is ideal. If that is not available, find shade.
2. Lay them down and elevate their legs slightly. This helps blood flow return to the core.
3. Remove excess clothing. Loosen anything tight around the neck, chest, or waist.
4. Apply cool, wet cloths to the skin. Focus on the neck, armpits, and groin — areas where blood vessels are close to the surface. A cooling towel works perfectly here.
5. Have them sip cool water slowly. Small sips, not gulps. If they are nauseous, do not force fluids.
6. Monitor for 30 minutes. If symptoms do not improve or worsen — especially if they become confused or stop sweating — this has progressed to heat stroke. Call 911.

For heat stroke

1. Call 911 immediately. Heat stroke is a medical emergency. Do not try to treat it entirely at home.
2. Move them to the coolest environment available. Every second in the heat makes it worse.
3. Cool them aggressively. Submerge them in a cold bath or shower if possible. If not, cover them with cold, wet sheets. Pack ice around the neck, armpits, and groin. Use a fan to increase evaporative cooling. The goal is to bring their body temperature down as fast as possible.
4. Do NOT give them anything to drink. A person with heat stroke may be confused or semi-conscious — they could choke. Let the paramedics handle fluid replacement.
5. Do NOT leave them alone. Stay with them until emergency services arrive. Monitor their breathing. If they stop breathing, begin CPR.

Protecting Pets and Children

Pets and young children are the most vulnerable members of your household during extreme heat. They cannot tell you when they are overheating, and they depend entirely on you to keep them safe.

Protecting children

• Keep them hydrated proactively. Offer water every 20 minutes, even if they say they are not thirsty. Children get absorbed in play and forget to drink.
• Limit outdoor play during peak heat. Move play indoors between 10 AM and 6 PM. If they must be outside, enforce shade breaks every 15 minutes.
• Watch for signs. A child who becomes unusually tired, cranky, stops sweating, or complains of a headache may be overheating. Bring them inside and begin cooling immediately.
• Test surfaces before bare skin contact. Playground equipment, metal slides, asphalt, and car seats can cause burns in seconds during extreme heat. Place your palm on the surface for 7 seconds — if you cannot hold it, it is too hot for a child's skin.
• Never leave a child in a car. Ever. Not for one minute. Not with the windows cracked. Not while you run into the store. The car interior reaches deadly temperatures in minutes.

Protecting pets

• Ensure constant access to fresh, cool water. Place multiple water bowls around your home and yard. Add ice cubes to keep the water cool longer.
• Walk dogs early morning or late evening only. Asphalt can reach 150 degrees F when air temperature is 95 degrees F. Place your palm on the pavement — if it is too hot for your hand, it is too hot for their paws.
• Know the signs of heat stroke in pets. Excessive panting, drooling, lethargy, vomiting, bright red tongue, and unsteadiness are warning signs. Move them to AC immediately and apply cool (not cold) water to their body. Contact your vet.
• Never leave pets in a parked car. Same rule as children — there is no safe duration.
• Provide shade and cooling options. A kiddie pool with a few inches of cool water, a damp towel to lie on, or a fan pointed at their resting area can help pets stay comfortable.

After the Heat Wave: Recovery

The heat wave has passed. Temperatures are dropping. You made it. But your body needs time to recover, and the risk is not completely over yet.

Continue hydrating aggressively for 24-48 hours

Your body may be mildly dehydrated even if you followed all the guidelines. Continue drinking extra water for at least two days after extreme heat ends. Your kidneys, heart, and other organs need time to recover from the stress of temperature regulation.

Watch for delayed symptoms

Heat-related illness can have a delayed onset. Fatigue, headaches, muscle cramps, and difficulty concentrating can appear 12 to 24 hours after heat exposure. If symptoms persist beyond 48 hours, see a doctor. People with chronic conditions should be especially watchful — heat stress can trigger cardiac events, kidney problems, and other complications in the days following a heat wave.

Debrief and improve your plan

After every heat wave, ask yourself: what worked and what did not? Did you have enough water? Did your cooling methods keep indoor temperatures safe? Did you check on vulnerable neighbors? Use the answers to improve your preparation for the next heat event. Because there will be a next one.

Essential Gear for Heat Wave Survival

These three products address the biggest heat wave risks — overheating, dehydration, and lack of cooling. They are affordable, practical, and could genuinely save your life or the life of someone in your household.

You Are Prepared, Not Panicked

Extreme heat is predictable. It comes every summer, and it is getting more intense. But the steps to stay safe are not complicated. Stock water. Know the signs of heat stroke. Have a plan for cooling your home. Check on the people around you who are most vulnerable. Hydrate before you are thirsty. And when the thermometer hits dangerous territory, take it seriously — the same way you would take a hurricane warning seriously.

The difference between someone who gets through a heat wave safely and someone who does not is almost never about physical toughness. It is about preparation and knowledge. You now have both. Share this guide with your family, your neighbors, and anyone you know who lives alone or without AC. The more people who are prepared, the fewer people we lose to something entirely preventable.

For more on keeping your household ready for summer emergencies, read our guides on cooling your home without AC, preparing for summer power outages, and keeping food cold when the power goes out.