Heat-Wave AC Checklist for Homeowners: Stay Cool When It Hits 110°F
A simple, do-it-now checklist to keep your air conditioner alive and your home livable through a multi-day extreme-heat event.
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With heat indices reaching 105–115°F across much of the country in July 2026 and power grids strained by non-stop air-conditioning, a little preparation goes a long way. This is a plain checklist you can run through in under an hour — no tools, no expertise required — to give your system the best chance of holding up.
Think of it in three parts: get the system ready before the peak, protect it during the hottest hours, and know the warning signs that mean it is time to call for help.
Before the peak (do this the morning of a hot stretch)
- Install a fresh air filter. Write the date on the frame so you know when it went in.
- Walk out to the condenser and clear leaves, grass clippings, and seed fluff from the fins. Hose the fins gently from the inside out if they look packed.
- Confirm two feet of clearance around the outdoor unit — move planters, trash cans, and anything leaning on it.
- Test the thermostat: new batteries, set to COOL, fan on AUTO.
- Locate your electrical panel and identify the AC breaker now, so you are not hunting for it in a hot house later.
During the hottest hours
- Set a steady, realistic temperature (78–80°F) and leave it there — do not chase it down and back up.
- Close blinds on any window getting direct sun.
- Run ceiling and box fans in occupied rooms so you feel cooler at a higher thermostat setting.
- Skip the oven, dryer, and dishwasher until after dark.
- If your utility offers a "reduce use" alert, honor it — grid strain during extreme heat can cause outages that take your AC down anyway.
Warning signs to watch for
Catching a struggling system early often means a small repair instead of a dead compressor. Stop and reassess if you notice any of these:
- Air from the vents is noticeably weaker or warmer than yesterday.
- The indoor coil, the copper lines, or the air handler show frost or ice.
- The outdoor unit hums but the fan is not turning.
- The system short-cycles — turning on and off every couple of minutes.
- Water is pooling around the indoor unit (a clogged condensate drain).
A safety word on the people in your home
Extreme heat is a health hazard, not just a comfort issue. Older adults, infants, people who are pregnant, and anyone with heart or respiratory conditions are most at risk. Keep water nearby, check on neighbors and relatives, and never leave children or pets in a parked car even for a minute. If your home becomes dangerously hot and cannot cool down, go to a public cooling center, library, or mall while you arrange service.
When to Call a Licensed Local Pro
- You have run the whole checklist and the house still will not drop below the mid-80s during the day.
- The outdoor fan will not spin, or the unit trips the breaker as soon as you reset it.
- You see ice on the lines that keeps coming back after you thaw it — a sign of low refrigerant or an airflow problem a tech should diagnose.
- Anyone in the home is showing signs of heat illness (dizziness, nausea, confusion, a headache that will not quit) — get them cool and hydrated first, and treat the AC as urgent.
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Call (307) 323-4488Frequently Asked Questions
How often should I change the filter during a heat wave?
Check it every two weeks while the system is running around the clock. A filter that would last a month in mild weather clogs faster when the fan never stops. If it looks gray, replace it.
Should I turn my AC off when I leave to save it?
Do not turn it fully off in extreme heat — the house heats up fast and the system then has to claw back a huge gap when you return, which is harder on it. Instead, set it a few degrees warmer while you are out (around 82–84°F) and let it hold.
My power keeps flickering — could that hurt my AC?
Yes. Repeated flickers and brownouts during grid strain are tough on the compressor. If the power drops, wait five full minutes before restarting the system so internal pressures can equalize. A hard-start kit or surge protection, installed by a pro, adds a margin of safety.
Is it worth a tune-up in the middle of summer?
If your system is limping, a mid-season tune-up can catch a weak capacitor or low charge before it strands you on the hottest day. It is far easier to get service scheduled before a failure than during the rush after one.
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