Why run a fall check in Tucson?

The monsoon season runs June 15 through September 30, and it leaves dust and debris behind. Your AC has also just finished a long season. Fall is the gap between cooling and heating, so it’s the easiest time to catch a problem before the first cold night. Climate Pros Tucson can match you with a licensed pro for anything on this list you can’t do yourself.

Tucson’s normal low reaches 47.9F in November and 40.5F in December at the airport (1991-2020 normals). Heating isn’t heavy, but a furnace or heat pump that hasn’t run in months should be tested before you need it.

1. Clear the outdoor unit

Dust storms occur during the monsoon, and the NWS lists them among its hazards. Remove leaves, dust and debris from around the outdoor unit. Turn the power off first, and don’t spray the fins with a hard stream. Let a pro handle a coil cleaning. See how to clean AC coils.

2. Change the filter

Dust loads the filter fast after a monsoon. Replace it, and write down the date. See HVAC filter guide for Tucson dust.

3. Test heat mode before you need it

Run your furnace or heat pump for a short test while the weather is still mild. Listen for odd noises and check that warm air comes out. If it blows cold or won’t start, you have time to call a pro. See furnace blowing cold air and heat pump not heating.

4. Check the carbon monoxide and smoke alarms

If you heat with gas, test every alarm and replace dead batteries. If an alarm sounds, get everyone outside and call 911. See carbon monoxide in a Tucson home.

5. Check the condensate drain

A summer of use can leave algae or debris in the drain line. A clogged line can shut the system off or leak. See AC drain line clogged in Tucson.

6. Shut down an evaporative cooler

If you have a swamp cooler, drain it and cover or close it per the manufacturer’s directions. Tucson Water says hard water builds calcium deposits in these coolers, and it advises regularly changing the pads and adding an in-line filter. Do the pad change at season’s end. See swamp cooler vs AC in Tucson.

7. Ask about a tune-up

TEP’s Efficient Home Program lists an AC tune-up rebate of up to $160 total as listed by TEP in October 2026, through participating contractors. It splits into $80 for a refrigerant charge repair and $40 each for indoor and outdoor coil cleaning. Confirm current terms with TEP. See pre-summer AC tune-up checklist for the other end of the year.

8. Look at what the season showed you

If a room never cooled, a bill jumped or the unit short cycled, write it down and tell the pro. See AC short cycling.

What needs a pro?

Refrigerant, electrical parts, gas connections and coil cleaning all need a licensed pro. Filters, clearing debris and checking alarms are yours. See HVAC maintenance, AC tune-up and the Tucson HVAC hub.

When to call us

If your system needs a fall tune-up or a heat-mode check, a licensed pro can do it before the cold arrives. Call (520) 353-2520 and we’ll match you with a licensed local pro.