What should you do first when your AC stops working?
Run through these checks in order. They take a few minutes and sometimes solve the problem.
- Thermostat: set to Cool, below room temperature, fan on Auto. Replace dead batteries.
- Filter: if it's clogged, replace it.
- Breaker: reset a tripped AC or furnace breaker once. If it trips again, leave it off.
- Ice: if the indoor coil or refrigerant line is frozen, turn the system off and don't chip the ice.
- Water: if the drain pan is full or water is on the floor, turn the system off and mop up.
- Outdoor unit: if it hums but the fan doesn't spin, turn the system off and call for service.
How do you stay safe in the heat while you wait for AC repair?
Heat illness is the real emergency. The National Weather Service lists heat stroke signs as a body temperature above 103°F, a throbbing headache, confusion, slurred speech, a rapid and strong pulse, and possible loss of consciousness. If you see these, call 911 right away, move the person somewhere cooler, and don't give them fluids, as the NWS advises.
Heat exhaustion comes first for many people: heavy sweating, weakness, cool and clammy skin, a fast and weak pulse, cramps, dizziness, or nausea. The NWS says to move the person somewhere cooler, loosen clothing, apply cool, wet cloths, and offer sips of water.
- Close blinds and curtains on sunny windows.
- Run fans, and stay in the coolest room of the house.
- Check on older adults, babies, people with health conditions, and pets.
- If the house gets too hot, go to a friend's home, a library, or a public cooling center.
When should you call 911 or PG&E instead of an HVAC company?
Some problems aren't AC repairs. If you smell natural gas near the furnace or water heater, PG&E says to leave the area right away, avoid anything that could make a spark, and call 911, then PG&E at 1-800-743-5000. If you see smoke or flames from equipment, get everyone out and call 911. For a downed power line, stay far away and call 911 and your electric utility.
What does emergency AC repair cost?
After-hours service costs more. Fixr's 2026 HVAC guide says after-hours calls often run 50% to 100% above standard rates or add $100 to $300, and its AC repair guide puts weekend and holiday surcharges at $50 to $200 or more. Diagnostic fees run about $75 to $200 on top of the repair.
These are national figures, and each independent provider sets its own rates and availability. When you call, ask about the after-hours fee and the diagnostic fee before the technician heads out.
How can you avoid an AC emergency next summer?
Schedule a spring tune-up, change filters on schedule, and keep about 2 feet of clear space around the outdoor unit. If your system is more than 10 years old, needs frequent repairs, or uses R-22, get replacement quotes in the off-season instead of during a heat wave, when choices are rushed.
| Situation | What to do |
|---|---|
| Smell of gas near the furnace | Leave now; call 911, then PG&E at 1-800-743-5000 |
| Smoke, flames, or burning smell from equipment | Turn the system off if safe, get out, and call 911 |
| Someone confused, very hot, or fainting | Call 911; move them somewhere cooler |
| AC blowing warm air, no ice | Check thermostat, filter, and breaker; then call for repair |
| Ice on coil or refrigerant line | Turn the system off; call for repair |
| Water leaking from indoor unit | Turn the system off and mop up; call for repair |
Need an AC repair technician in the Sacramento area?
One call connects you with an independent local AC repair technician. Calling is free; you agree on the price and the work directly with the provider.
Frequently asked questions
What should you do when your AC unit freezes up inside?
Can someone come out the same day?
Will my AC work during a PG&E power shutoff?
Sources
- AC Not Blowing Cold Air? Learn What to Do — Trane
- What To Do If the AC Evaporator Coil Is Frozen — Trane
- Air Handler Dripping Water: Causes and Solutions — Trane
- Heat Safety: Heat-Related Illnesses — National Weather Service
- Gas safety — Pacific Gas and Electric Company (PG&E)
- Public Safety Power Shutoffs — Pacific Gas and Electric Company (PG&E)
- HVAC Service Repair Costs (2026 Guide), updated October 22, 2026 — Fixr
- AC Repair Cost: Common Issues & When to Replace (2026), updated August 4, 2026 — Fixr
- Air Conditioner Repair Cost (2026 Pricing), updated March 16, 2026 — This Old House
- Maintenance Checklist (heating and cooling) — ENERGY STAR (EPA/DOE)
- Heating & Cooling — ENERGY STAR (EPA/DOE)
- Central AC Maintenance: Routine Tasks and Tips — Trane
- Purchasing and Repairing Home Air-Conditioners or Heat Pumps (HCFC-22 phaseout) — U.S. Environmental Protection Agency (EPA)