Extreme Heat Survival Guide: Protect Your Family in a Heat Emergency
Extreme heat kills more Americans annually than any other weather-related disaster: more than floods, tornadoes, and hurricanes combined. During the 2021 Pacific Northwest heat dome, temperatures exceeded 116°F in Portland and killed nearly 800 people in a region with limited air conditioning infrastructure. Extreme heat emergency supplies and cooling strategies are as critical as any other disaster preparedness measure: especially for households with elderly members, infants, outdoor workers, or people with cardiovascular or respiratory conditions. This guide covers who is most at risk, effective cooling strategies, and the supplies that matter most during a heat emergency.
Who Is Most at Risk in Extreme Heat
- Elderly adults (65+): Decreased ability to regulate body temperature; reduced thirst sensation (dehydration is a major risk); medications that impair heat response
- Infants and young children: Immature thermoregulation; depend on adults to monitor and respond to heat stress
- People with cardiovascular disease: Heat stress increases cardiac demand; extreme heat is a major trigger of cardiac events
- People with obesity: Fat tissue is an insulator; obese individuals generate more heat and cool less efficiently
- Outdoor workers and athletes: High exertion + heat exposure; construction workers, farm workers, and military personnel
- People on certain medications: Diuretics, antihistamines, antidepressants, antipsychotics, beta blockers: many common medications impair heat regulation
- People without air conditioning: The most significant risk factor; homes without AC can reach dangerous temperatures within hours of an extreme heat event
Recognising Heat Illness
| Condition | Symptoms | Action |
|---|---|---|
| Heat Cramps | Muscle cramps (calves, abdomen), heavy sweating | Rest in cool place; drink water/sports drink; stretch cramping muscles |
| Heat Exhaustion | Heavy sweating, cool/pale/clammy skin, weak pulse, nausea, headache, dizziness, fainting | Move to cool place; loosen clothing; apply cool wet cloths; sip water; call 911 if vomiting or condition worsens |
| Heat Stroke (Emergency) | High body temp (103°F+), hot/red/dry skin, rapid strong pulse, confusion, unconsciousness | CALL 911 IMMEDIATELY; cool person rapidly by any means (cold water immersion, ice packs to neck/armpits/groin); do NOT give water to an unconscious person |
Effective Cooling Strategies
Body Cooling
- Cold water immersion: The most effective cooling method for heat stroke: immerse in a bathtub of cold water; reduces core temperature faster than any other method
- Ice packs to high blood-flow areas: Neck, armpits, and groin have blood vessels close to the surface; ice packs here cool blood returning to the core
- Wet towel + fan: Evaporative cooling: wet a towel or sheet, apply to skin, direct fan airflow over it; effective in low-humidity environments
- Misting + fan: A spray bottle of water + fan creates significant evaporative cooling; the most practical non-electrical method
- Hydration: Drink 8 oz of water every 15–20 minutes during heat exposure; avoid alcohol and caffeine
Ambient Cooling
- Window air conditioner: The most effective cooling for a single room; a 5,000–8,000 BTU window AC cools a 150–350 sq ft room; run on a generator if grid power fails
- Evaporative cooler (swamp cooler): Effective in low-humidity climates (Southwest US); less effective in humid climates
- Portable (ventless) AC: Less effective than window units but requires no window installation; produces some heat as a byproduct
- Fans + cross-ventilation: Fans move air but do not cool it: only effective below approximately 95°F; above that, a fan in a hot room makes conditions worse by warming rather than cooling
- Cooling centres: Public libraries, shopping centres, and government-designated cooling centres provide free refuge; find locations at your local emergency management website during heat emergencies
Passive Cooling
- Close blinds and curtains on sun-facing windows during daylight: solar heat gain through glass is substantial
- Open windows at night when outdoor temperatures drop below indoor temperature
- Move to the lowest floor: heat rises; ground-floor and basement areas are cooler
- Minimise heat-generating activities: use outdoor grills instead of ovens, avoid hot showers, delay energy-intensive appliances until cooler hours
Power Outage + Extreme Heat: The Dangerous Combination
Power outages frequently occur during heat emergencies: high demand from air conditioning overloads the grid. A power outage during extreme heat is a life-threatening scenario, particularly for vulnerable individuals:
- Portable solar generator: An EcoFlow Delta 2 or similar running a 5,000 BTU window AC can cool one room for several hours: providing a heat refuge even without grid power
- Prioritise those most at risk: If power goes out during extreme heat, immediately check on and assist elderly family members, neighbours, or others without cooling options
- Go to a cooling centre: During a multi-day heat emergency with no power restoration, a public cooling centre is the right answer for vulnerable individuals
- Cool the room, not the house: Concentrate cooling resources (generator, AC, ice) on one room and have everyone in the household use that single cooled space
Heat Emergency Supplies Checklist
- Window air conditioner (5,000–8,000 BTU for single room) × 1
- Portable generator or solar power station (to run AC during outages)
- Box fans or tower fans × 3
- Spray bottles × 4: fill with cool water for misting cooling
- Cooling towels (evaporative) × 4 per person
- Cold packs (reusable gel) × 6: for ice pack cooling of neck/armpits
- Frozen water bottles × 12: for body cooling and drinking
- Electrolyte powder or sports drinks × 30-day supply
- Water: 1 gallon per person per day × 7 days (hydration needs increase dramatically in heat)
- Light-coloured, loose, breathable clothing (cotton and linen)
- Wide-brim hats × 1 per person
- Sunscreen (SPF 50+)
- Digital thermometer: for monitoring body and ambient temperatures
- NOAA weather radio: for heat advisory alerts
Recommended Products
Frigidaire FFRE053WAE 5,000 BTU Window Air Conditioner
A window air conditioner is the only practical cooling solution during extreme heat for homes without central AC. The Frigidaire FFRE053WAE cools up to 150 sq ft at 5,000 BTU: a bedroom, a small apartment, or the single “cool room” in a larger home during a power-conserved emergency. It draws approximately 500W: within the capability of a 1,000Wh solar generator for several hours: making it the right pairing for power-outage heat events. At under $200, it is the most cost-effective and impactful extreme heat preparedness purchase for households without central air.
- 5,000 BTU; cools up to 150 sq ft
- 500W draw: runnable on a solar generator for several hours
- Best emergency heat mitigation for homes without central AC
Ergodyne Chill-Its 6700 Evaporative Cooling Towel
Evaporative cooling towels are one of the most effective and least expensive heat mitigation tools available. Wet the towel, wring it out, and place it on the back of the neck or wrap it around the wrist: evaporation removes heat from the blood flowing through the major vessels near the surface. The Ergodyne Chill-Its towel is the most reviewed and most consistent evaporative cooling towel in its price range, staying cool for up to 4 hours per wetting and machine-washable for long-term use. At under $15 each, stock one per household member: they’re particularly effective for outdoor workers, athletes, and as immediate relief during a cooling emergency.
- Up to 4 hours cooling per wetting; machine washable
- Effective cooling applied to neck, wrists, and forehead
- Under $15 each: most cost-effective immediate heat relief
Extreme Heat FAQ
At what indoor temperature does heat become dangerous?
The danger threshold varies by individual. For healthy adults: sustained indoor temperatures above 95°F (35°C) become dangerous without cooling and hydration. For vulnerable individuals (elderly, infants, cardiovascular conditions): indoor temperatures above 80°F (27°C) with high humidity can cause heat stress. The combination of temperature and humidity matters: the Heat Index (apparent temperature) accounts for humidity: 90°F at 90% humidity feels like 122°F to the body. Check the National Weather Service heat index chart for your conditions. Any indoor temperature that feels uncomfortable for an extended period requires active cooling measures.
Is it safe to sleep in a hot house?
Sleeping in a hot environment (above 80°F/27°C) is dangerous, particularly for vulnerable individuals. During sleep, your awareness of discomfort and your body’s ability to respond to warning signs is reduced. Heat illness can develop during sleep without waking the affected person. Recommended precautions for sleeping in a hot house: maximise airflow with fans, wet sheets or cooling towels, cool the bedroom with a window AC unit if available, and check frequently on vulnerable household members (elderly, infants) during extremely hot nights. If temperatures remain dangerously high overnight and cooling resources are exhausted, go to a 24-hour cooling centre or a hotel with air conditioning.