When an air conditioner fails in Tucson, the house does not stay comfortable for long. Cooling season runs for months, and a system that was merely tired in May is often the one that quits on a triple-digit afternoon. Sabino Creek Heating & Cooling diagnoses residential air conditioners in Tucson and the nearby communities on our service areas page. The visit starts with the symptom you can describe, not with a parts list.
Warm air at the supply vents is the usual reason people write in. That can be a capacitor, a contactor, a blower that is not moving air, a thermostat still set to Heat, or a compressor that is not starting. Those are not the same repair, and they are not all obvious from the yard. A system that still blows cool air while the house climbs is a different problem. That pattern is an AC that can’t keep up. A system that quit after a dust storm may be a coil packed with mud — monsoon dust — or an electrical fault the storm exposed. Say which afternoon it started.
Symptoms, likely causes, and published ranges
The price column is not our price. It repeats national figures from HomeAdvisor’s AC repair cost guide, updated June 17, 2026. Tucson labor and the actual part can land outside those ranges. A firm number comes after the equipment is seen.
| Symptom | Likely cause | How it’s checked | Typical published range |
|---|---|---|---|
| Outdoor fan hums, stalls, or never starts, and the air is warm | Run or start capacitor | Power off, then a meter on the capacitor. The contactor is checked at the same time. | Capacitor replacement $120–$475 |
| Outdoor unit is silent | Breaker, disconnect, contactor, or capacitor | Reset a tripped breaker once. If it trips again, leave it off. Then the contactor and capacitor. | Capacitor as above. Other parts are quoted after diagnosis. HomeAdvisor lists a service call around $75–$200. |
| Outdoor unit runs and the supply air is warm | Low refrigerant, a dirty coil, or a compressor that is not pumping | Gauges, a look at the coil, and amp draw. Refrigerant is not “low” just because the house is hot. | Recharge $100–$600. Find-and-repair a leak $225–$1,600. Compressor replacement $1,200–$2,800. |
| Ice on the large copper line | Low airflow or a low charge | System off until the ice melts. Then the filter, blower, and gauges. | Use the charge and leak ranges only if refrigerant is the cause. An airflow fix is quoted after diagnosis. |
| Water at the indoor unit | Clogged condensate drain or a cracked pan | Clear the trap and watch the float switch. | Not a separate HomeAdvisor line. Quoted after diagnosis. |
| Grind, buzz, or a hard start outdoors | Fan motor, contactor, or a failing compressor | Blade clearance, motor amps, and whether the contactor is pitted. | Blower or fan-motor replacement $250–$800 when that is the part. Compressor as above. |
| Short cycling | Thermostat location, a dirty coil, low charge, or the control board | How long it runs, the filter, the coil, and the board only if the sequence is wrong. | Circuit-board replacement $150–$700 when the board is the failed part. |
Checks that are safe before you send the form
Confirm the thermostat is on Cool, the setpoint is below the room temperature, and the fan is on Auto. Look at the filter. If you cannot see light through it, replace it. From a few feet back, look at the outdoor unit: is the fan turning, and is the air off the top warmer than the yard? Try a tripped breaker once. If it trips again, leave it off. If the large copper line is iced, turn the system to Off and let it thaw before you run it again. Leave the electrical compartment closed. Do not pressure-wash the fins.
Recurring ice, a breaker that will not stay on, a burning smell, or water coming through a ceiling are reasons to stop experimenting. Put that in the details. Smaller changes — a new noise, one room that used to keep up, a little water at the air handler — are collected on AC warning signs. If the cooling is already off and the house is heating up, the shorter version of what to do next is emergency AC repair. That page is a same-business-day callback. It is not an overnight dispatch line.
Repair, then the other fork
A failed capacitor on a system that still fits the house is a repair. A repeating refrigerant leak, a second major part, or comfort that never came back after the last repair is a different conversation. That fork is repair or replace. What actually changes the price of a new system, without a made-up price list, is on AC replacement cost. The nameplate refrigerant matters when someone has been “adding Freon” every summer: R-22, R-410A, and newer refrigerants. We do not give a firm repair price before the equipment has been seen.
Use the form on this page. Name, mobile phone, ZIP, and what’s going on are required. Street address is optional until a visit is scheduled. Choose AC not cooling, or Replacement quote if you already know you are at that fork. Choose System down now only when the cooling is actually down. We follow up the same business day by phone or email. Coverage is confirmed from the ZIP.
Cost and rebates: AC repair cost, new AC cost, TEP rebates. If the cooling is already off, what to do when the AC quits. Heating: heating repair. Areas: Midtown, Flowing Wells, Oro Valley, Marana, Dove Mountain, Catalina Foothills, Tanque Verde, Rita Ranch, Vail, Corona de Tucson, Sahuarita, Casas Adobes, Green Valley, all areas.