When the AC quits during a Tucson heat wave, the first decision is not which part failed. It is whether everyone in the house can remain there safely while help is arranged.
Protect people and pets first
Older adults, young children, pets and people with heat-sensitive medical conditions may need to move to a reliably cooled location. Close blinds, avoid using the oven and limit trips through exterior doors. Fans move air but do not make a dangerously hot room safe. Call 911 for a medical emergency.
Five minutes of safe checking
Confirm that the thermostat is set to Cool, below room temperature, with the fan on Auto. Check the filter and make sure returns are not blocked. Look for water or ice around the indoor equipment without removing panels.
You may reset the labeled HVAC breaker once. If it trips again, leave it off. Repeated resets can worsen electrical or compressor damage. The same applies if the outdoor unit hums without starting or there is a burning odor.
What your observations can tell us
Air moving indoors with a silent outdoor unit points in a different direction than no airflow at all. Ice suggests an airflow or refrigeration problem. Water may indicate a blocked condensate drain or frozen coil. A series of clicks or a hum may involve startup components. These are clues, not instructions to open the cabinet.
Do not improvise a repair
Do not bypass a drain switch, power equipment with an extension cord, scrape ice or add refrigerant without finding why it is low. Lowering the thermostat farther will not make a struggling system cool faster.
For urgent Tucson cooling help, call 520-303-3220 or visit 24/7 emergency service. For a non-urgent appointment, book online.