Your A/C Died and It Is 112 Outside: A Practical Plan
First the safety part, then the things to check yourself, then how to make the house survivable while you wait.
If your air conditioner fails in extreme Phoenix heat, first check the filter and the breaker, then set the thermostat fan to ON, close all blinds, and move to the coolest room. If indoor temperatures approach the mid-90s and anyone in the home is elderly, an infant, or medically vulnerable, relocate to a cooled space while repairs are arranged. Heat illness develops faster than most people expect.
Safety first, honestly
Arizona records heat-related deaths every summer, and indoor heat exposure is a real part of that. When indoor temperatures pass the mid-90s, this stops being a comfort problem.
The people at highest risk are adults over 65, infants and small children, anyone with cardiovascular or respiratory conditions, anyone on medications that affect thermoregulation — which includes many common blood pressure and psychiatric prescriptions — and pets.
If that describes anyone in your household and the house is climbing, make a plan to be somewhere else. A relative, a hotel, a library, a mall, or a designated cooling center. That is not an overreaction; it is the correct response, and the repair will still happen while you are somewhere safe.
The two checks worth doing before you call
- The filter. Pull it. If it is grey and matted, the system may have frozen solid. Replace it, turn cooling OFF and the fan ON, and give it a few hours to thaw. A meaningful share of no-cool calls are exactly this.
- The breaker. Check the panel for a tripped A/C breaker, and check the outdoor disconnect box beside the condenser. Reset a tripped breaker once. If it trips again, leave it off and call — a repeatedly tripping breaker means an electrical fault, and repeated resets are a fire risk, not a fix.
Also worth thirty seconds: confirm the thermostat is set to COOL, the setpoint is below room temperature, and the batteries are not dead. It happens more often than anyone admits.
Making the house survivable while you wait
- Set the thermostat fan to ON. Moving air does not cool the house but it makes a real difference in how the heat feels.
- Close every blind, curtain, and shade on every sun-facing window. Cardboard or foam board in a west window is not pretty and works well.
- Close off unused rooms and concentrate in the coolest part of the house — usually a north-facing interior room on the ground floor.
- Run bathroom and kitchen exhaust fans to pull hot air out of the house.
- Do not use the oven, the stove, or the clothes dryer.
- Drink water continuously, more than you feel like you need.
- Cool showers, damp towels on the neck and wrists, and a box fan pointed at you.
- Once outdoor temperature drops below indoor temperature after dark, open windows and run fans to flush the house.
What to tell us when you call
A few specifics let us triage accurately and often bring the right part on the first visit.
- Is the outdoor unit running at all? Is the fan spinning?
- Is air coming from the vents, and is it cool, room temperature, or warm?
- What is the thermostat set to and what is the house actually reading?
- Any unusual sounds, smells, or visible ice?
- When was the filter last changed?
- Does anyone in the home have heat-related medical vulnerability?
That last question is not filler. It changes where you land in the queue.
What to expect on timing
During a Valley heat wave, every HVAC company in the metro is running at capacity and honest ones will tell you that. We triage by severity — vulnerable households and the hottest indoor temperatures first — and we will give you a real arrival window rather than a comfortable-sounding one we cannot keep.
If we cannot get to you today, we say so, so you can make an informed decision about where to spend the night. That is more useful than optimism.
Frequently asked
What should I do if my A/C stops working in extreme heat?
Check the filter and the breaker first. Then set the fan to ON, close all blinds, move to the coolest room, and drink water steadily. If indoor temperatures approach the mid-90s and anyone in the home is elderly, an infant, or medically vulnerable, relocate to a cooled space while the repair is arranged.
How hot is too hot inside a house?
Risk rises meaningfully above the mid-80s for vulnerable people and above the low 90s for healthy adults, especially with sustained exposure and higher humidity. Heat illness develops faster than most people expect, and confusion or stopping sweating are emergency signs — call 911.
Can I reset my A/C breaker if it trips?
Once. If it trips again, leave it off and call a technician. A repeatedly tripping breaker indicates an electrical fault — a shorted compressor, a failing motor, or damaged wiring — and repeatedly resetting it is a genuine fire risk.