On a 110°F-plus afternoon in Surprise, it is normal for a properly working air conditioner to run almost nonstop. It becomes a problem when the system runs constantly but your home cannot stay within about 20 degrees of the outdoor temperature, when it runs nonstop on mild days, or when your electric bill jumps.
When constant running is normal
Most systems are designed to hold a certain temperature difference from outdoors. On the hottest days of the year, a healthy system in the West Valley may run for hours at a time. If your home is holding a comfortable temperature, that is usually fine.
Warning signs
- The house cannot stay within about 20 degrees of the outdoor temperature
- The system runs nonstop on 90°F days
- Warm air from the vents
- Your electric bill is much higher than last summer
- Some rooms are far warmer than others
Common causes
- Dirty filter or coilsRestricts airflow and heat transfer.
- Low refrigerantA leak reduces cooling capacity.
- Leaky ductsCooled air is lost to a hot attic.
- Undersized or aging systemIt may simply not have the capacity anymore.
- Thermostat problemsMisreading the temperature or set too low.
Related prices
| Service | Typical Price Range |
|---|---|
| Condenser Coil Cleaning | $125–$300 |
| Refrigerant Leak Detection | $250–$700 |
| Duct Sealing | $600–$2,500 |
| Annual A/C Tune-Up | $95–$250 |
Typical ranges for guidance only; your exact price is given in writing before any work begins. See our full price guide.