How to Prepare for Extreme Heat Events

NOAA ranked 2023 as the warmest year in its global temperature record at that time, before 2024 surpassed it. Extreme heat is also identified by the National Weather Service as the leading weather-related cause of death in the United States.

Unlike hurricanes or tornadoes, an extreme heat wave may cause widespread illness without visible structural damage. Prolonged exposure can overwhelm the body's ability to stay cool, particularly when high daytime temperatures are combined with warm nights, humidity or limited access to air conditioning.

Anyone can develop heat-related illness. Older adults, infants, pregnant people, outdoor workers and people with certain chronic health conditions may face greater risk or may have more difficulty staying cool.

Extreme heat can also increase electricity demand and stress local infrastructure. If an outage occurs, households may lose air conditioning, refrigeration, communications equipment and access to electricity-dependent medical devices.

This guide explains how to prepare for an extreme heat wave, recognize heat exhaustion and heat stroke, develop a cooling plan and calculate backup-power runtime for selected household essentials.

Key Takeaways

• Extreme heat is a major weather-related health hazard. Preparation should prioritize access to air conditioning, regular hydration, early recognition of heat illness, and a plan for vulnerable household members.

• Heat illness can worsen rapidly. Confusion, slurred speech, seizures, loss of consciousness, or a very high body temperature may indicate heat stroke and require immediate emergency assistance.

• Fans may improve comfort when indoor temperatures remain below 90°F. CDC advises against relying on fans at higher indoor temperatures because moving very hot air may increase body temperature.

• Extreme heat may contribute to outages through high electricity demand, equipment stress, wildfire risk, or utility emergency actions. Outage duration varies by location and cause.

• Portable power stations support selected fans, refrigerators, communications equipment and compatible medical devices when loads are calculated carefully.

• The Apex 300 can be expanded with B300K or B500K batteries for higher-capacity backup. Daily runtime depends on the connected equipment, operating conditions and access to recharging.

Building Your Heat Emergency Checklist

Heat Safety Tips for Staying Cool Indoors

The main goal during extreme heat is to keep household members in a safely cooled environment. Air conditioning or relocation to an air-conditioned location is more protective than relying on fans alone.

Reduce solar heat before temperatures peak: Close blinds, curtains, or exterior shades on sun-facing windows. South- and west-facing windows may receive substantial afternoon sun, but the most affected windows depend on the building's orientation.

Choose the coolest safe room: Use an indoor thermometer to compare rooms. Consider sun exposure, ventilation, humidity, air quality, accessibility, and whether the space can be cooled safely. Do not assume that the lowest floor is always the best location.

Use fans carefully: Fans can circulate air and improve comfort when indoor temperatures are below 90°F. Above that level, move to an air-conditioned space or cooling center rather than relying on a fan.

Ventilate only when conditions are suitable: When outdoor air becomes cooler than indoor air and local air quality is acceptable, opening windows may help release stored heat. Keep windows closed during wildfire smoke, high pollution or when outside air remains dangerously hot.

Stay hydrated: Drink water regularly rather than waiting until you feel very thirsty. Individual needs vary with activity, age, health conditions, medication and medical advice. Limit alcohol, and do not rely on highly caffeinated or sugary drinks as the primary source of hydration.

Know where to find cooling: Locate nearby cooling centers, libraries, community centers or other air-conditioned public spaces before the heat wave arrives. Cooling-center information may be available through local emergency management, public-health departments, municipal websites or 2-1-1.

Recognizing Heat-Related Illness

Heat-related illness can range from muscle cramps and exhaustion to life-threatening heat stroke. Symptoms do not always follow one fixed sequence, so monitor the person's condition closely.

Heat stroke is a medical emergency. CDC notes that body temperature can rise to 106°F or higher within 10–15 minutes in some cases. Do not wait for every symptom to appear before calling emergency services.

Some medications may affect sweating, circulation, alertness, or fluid balance. Ask a healthcare professional whether prescription or over-the-counter medication changes the household heat plan. Never stop or alter medication without medical advice.

How Extreme Heat Causes Power Outages

Understanding how extreme heat can affect electricity supply helps households plan for the possibility of an outage.

Why Power Outages May Occur During Extreme Heat

Extreme heat can increase electricity demand, reduce the efficiency of some electrical equipment and place additional stress on local distribution infrastructure. However, the cause and likelihood of an outage vary by region, grid conditions and utility operations.

Outages during hot weather may result from equipment failures, wildfires, storms, damaged infrastructure or unusually high demand. In rare grid emergencies, system operators may use controlled outages to protect the wider network.

Outage duration depends on the cause and extent of damage. Follow alerts from the local utility.

What Portable Power Can Realistically Do

Central air-conditioning systems often require substantial running and startup power. A compatible small room air conditioner may provide temporary cooling, but it can deplete a battery rapidly. Backup power should therefore support a broader heat-safety plan that includes access to an air-conditioned location if indoor temperatures become unsafe.

More practical priority loads may include:

BLUETTI Solutions for Extreme Heat Preparedness

Targeted Backup for Selected Essential Loads

The appropriate model depends on the household's measured daily energy demand rather than a promised number of outage days.

BLUETTI Elite 100 V2 — 1,024 Wh, 1,800 W

At approximately 25 lb, the Elite 100 V2 may suit selected low-to-moderate loads such as communications equipment, lighting, a compatible fan or a refrigerator used according to a load-priority plan.

The product supports 1,024 Wh of capacity and 1,800 W of rated output. Using the Elite 100 V2 formula, a steady 50 W load has an estimated runtime of approximately 13.8 hours, while a steady 100 W load has an estimated runtime of approximately 7.5 hours.

BLUETTI Elite 200 V2 — 2,073.6 Wh, 2,600 W

With 2,073.6 Wh of capacity and 2,600 W of output, the Elite 200 V2 provides additional capacity for households that need to support several selected devices, such as refrigeration, communications, and compatible medical equipment.

Using its runtime formula, a steady 50 W load has an estimated runtime of approximately 26.4 hours, a 100 W load approximately 14.4 hours, and a 500 W load approximately 3.1 hours.

BLUETTI Elite 300 — 3,014.4 Wh, 2,400 W

The Elite 300 offers higher capacity for households with larger daily energy requirements. It includes approximately 3,014.4 Wh of capacity and 2,400 W of rated output.

Using the Elite 300 runtime formula, a steady 50 W load has an estimated runtime of approximately 41.6 hours, a 100 W load approximately 22.7 hours, and a 500 W load approximately 4.9 hours.

BLUETTI Elite 400 — 3,840 Wh, 2,600 W

The Elite 400 provides higher-capacity movable backup for selected household loads.

Expandable Backup for Higher Energy Requirements

For households with higher energy requirements, the BLUETTI Apex 300 can be combined with compatible expansion batteries. The base unit provides 2,764.8 Wh of capacity and 3,840 W of rated output.

The system scales through two expansion batteries:

• Apex 300 base unit: 2,764.8 Wh

• Apex 300 + one B300K: 5,529.6 Wh

• Apex 300 + one B500K: 7,884.8 Wh

• Apex 300 + two B300K batteries: 8,294.4 Wh

• Apex 300 + two B500K batteries: 13,004.8 Wh, or approximately 13 kWh

Using the Apex 300 base-unit formula, a steady 50 W load has an estimated runtime of approximately 33.8 hours, a 100 W load approximately 19.7 hours, and a 500 W load approximately 4.5 hours.

Finalizing Your Extreme Heat Preparedness Plan

A heat emergency plan should be prepared before a warning is issued.

Conclusion

Extreme heat can become dangerous without producing obvious physical damage. A strong preparedness plan combines access to air conditioning, hydration, symptom awareness, safe food and medication storage, regular check-ins, and a plan for electricity-dependent needs.

Backup power may support selected refrigeration, communications and compatible medical equipment, but it cannot make a dangerously hot home safe. If indoor temperatures cannot be controlled, relocate to an air-conditioned location.

Review the plan before heat arrives, test compatible equipment, and follow local public-health and utility instructions throughout the event.

Frequently Asked Questions

What Are the Most Important Items on a Heat Emergency Checklist?

Prioritize access to an air-conditioned location, drinking water, an indoor thermometer, sun-blocking window coverings, required medication, communication equipment and a plan for vulnerable household members.

How Do You Prepare for Extreme Heat if the Power Goes Out?

Cool the home to a safe and comfortable level before peak heat, where possible, while following utility conservation requests. Close blinds and curtains, reduce heat-producing activities, and monitor indoor temperature.

Use fans only when indoor temperatures remain below 90°F. If the home cannot be kept safely cool, relocate to an air-conditioned location rather than waiting for severe symptoms.

What Are Effective Heat Safety Tips for Vulnerable Individuals?

Older adults and people living alone may need regular check-ins based on their health, living conditions, and local public-health guidance. Watch for unusual weakness, dizziness, headache, nausea, confusion or changes in behavior.

Infants and young children regulate body temperature less effectively than adults and require close supervision, regular fluids where age-appropriate, and access to safe cooling. Never leave a child or pet in a parked vehicle.

How Long Will Food Stay Safe in the Refrigerator During a Summer Blackout?

FDA guidance states that an unopened refrigerator generally keeps food cold for about four hours. A full freezer may maintain temperature for approximately 48 hours, while a half-full freezer may do so for approximately 24 hours if the door remains closed.

Use appliance thermometers. Keep the refrigerator at 40°F or below and the freezer at 0°F or below. Do not rely on food appearance or smell to determine safety.

Can a Portable Power Station Run an Air Conditioner During an Extreme Heat Wave?

It may operate a compatible small room air conditioner if both running and startup requirements are within the station's limits. However, air conditioning is a high-demand load and can deplete the battery quickly.

Use the product-specific runtime formula with the appliance's measured average wattage. Maintain another plan for reaching an air-conditioned location if battery capacity becomes insufficient.