You are watching the house and the AC stopped.

House sitting in a Phoenix summer carries one real risk, and it is this one. Here is how to handle it without making it worse.

First ten minutes

Check the obvious, in this order.

1. Thermostat: screen on, set to COOL, setpoint below room temperature, fan on AUTO. If the screen is blank and it takes batteries, change them.
2. Breaker panel: look for a tripped AC breaker. Reset it once. If it trips again, leave it off and say so.
3. Outside: is the fan on top of the unit spinning, is the compressor humming, are the fins caked with dust.
4. The drain pan at the indoor unit: standing water means a float switch has shut the system off on purpose. That is the most commonly missed cause of a dead AC.

Photograph what you find as you go. It takes seconds and it makes the next conversation much shorter.

Then message the owner

Give them something they can act on, not just the problem:

AC stopped at about 2pm. Thermostat is on and set to 76, house is at 84. Breaker had not tripped. Outdoor fan is not spinning but the unit is humming. No water in the drain pan. Photos attached. Do you want me to call somebody?

That message contains everything a technician needs to narrow it down over the phone. A humming unit with a still fan, for instance, is usually a capacitor, which is a flat price.

While you wait

Close blinds on the sun side. Radiant gain through west glass is the single biggest thing you can cut.

Stop making heat. Oven, dryer, unnecessary lights off.

Move pets to the coolest, most interior room with plenty of water. They cannot tell you they are struggling and they cope worse than you do.

Use fans with water on your skin. Above roughly body temperature a fan alone stops helping.

Open at night, close at dawn, if the overnight low makes it worth it.

What not to touch

• Do not keep resetting a breaker that keeps tripping.
• Do not bypass a float switch. It is protecting a ceiling.
• Do not pull the disconnect and push it back in repeatedly to force restarts. That skips the compressor protections.
• Do not add refrigerant or let anyone talk you into authorising it. Not your call, and a sealed system that is low has a leak.

When it stops being about comfort

If the house passes the mid nineties, or if anybody vulnerable or any animal is in it, that stops being a maintenance question. Get them somewhere cool. Maricopa County runs cooling centres all summer, and a library or a mall works.

Tell the owner you did it and why. No reasonable person would rather have a comfortable pet story end differently to save a call-out fee.

What a call costs them

Worth knowing so you can tell them. Finding the fault on a running-badly system is a diagnostic; the common repairs like capacitors and contactors are flat prices published in advance. Nothing gets done without the owner agreeing to the number first, which is exactly the reassurance they will want from two thousand miles away.