Heatwave Prep Checklist

Extreme heat kills more people each year than any other weather event. Power grids fail, AC units give up, indoor temperatures climb, and dehydration sneaks up fast. This checklist focuses on what actually keeps you alive and comfortable when temperatures spike.

For related seasonal prep, see Summer Fire Risk Checklist, Power Outage Readiness Checklist, and Basic Disaster Readiness Checklist.

1. Cooling System Readiness

• [ ] Clean or replace AC filters before heat season starts.
• [ ] Check for blocked vents and ensure full airflow.
• [ ] Shade outdoor AC condensers to improve efficiency (but do not block airflow).
• [ ] Test the AC early—don’t wait for a 110°F day.

2. Home Cooling Efficiency

• [ ] Close blinds, curtains, and blackout shades during peak sun.
• [ ] Use fans to push hot air out and pull cooler air in during mornings and nights.
• [ ] Seal drafty windows to keep cold air in.
• [ ] Set ceiling fans to spin counterclockwise for maximum cooling.

3. Hydration and Personal Safety

• [ ] Stock plenty of water—at least several gallons per person.
• [ ] Avoid alcohol and sugary drinks during extreme heat.
• [ ] Wear light, breathable clothing indoors.
• [ ] Watch for early signs of heat exhaustion: dizziness, headache, nausea, rapid heartbeat.

4. Power Outage Preparation

• [ ] Charge all power banks before heatwaves begin.
• [ ] Stage battery-powered fans or cooling packs.
• [ ] Keep freezer and fridge closed as much as possible.
• [ ] Know how to open the garage door manually.

5. Appliances and Electrical Load

• [ ] Avoid running ovens, dryers, and dishwashers during peak heat.
• [ ] Unplug non-essential devices to reduce load on the electrical system.
• [ ] Run heavy appliances only at night.
• [ ] Check cords for heat damage or fraying.

6. Pets and Vulnerable Individuals

• [ ] Bring pets inside—pavement burns paws quickly.
• [ ] Ensure older adults, infants, and medically fragile people have cooling access.
• [ ] Keep multiple water bowls available.
• [ ] Never leave pets or kids in vehicles, even for a minute.

7. Outdoor Safety and Yard Prep

• [ ] Water plants early morning only.
• [ ] Check irrigation timers to avoid wasting water.
• [ ] Clear dry brush—heatwaves increase fire risk.
• [ ] Avoid using power tools during red-flag or extreme heat days.

8. Medical and Emergency Prep

• [ ] Store electrolyte packets for heat illness recovery.
• [ ] Check medications for heat sensitivity or refrigeration needs.
• [ ] Know the addresses of cooling centers in your area.
• [ ] Keep a backup thermometer for monitoring indoor temperatures.

9. Vehicle and Travel Prep

• [ ] Keep coolant and engine oil topped off.
• [ ] Check AC performance before long drives.
• [ ] Store water and sunshade in the vehicle.
• [ ] Avoid long trips during peak heat unless necessary.

10. After the Heatwave

• [ ] Inspect AC filters for heavy dust buildup.
• [ ] Check plants and outdoor systems for heat damage.
• [ ] Restock water and cooling supplies used during the heatwave.
• [ ] Review what worked and update your plan for next time.

Heatwaves hit harder every year. Prepping your cooling, water, and electrical systems before the temperature spikes is the difference between discomfort and a medical emergency. This checklist keeps your home ready for extreme heat.