An outside unit that hums while the fan stays still is the call we get most in July in Sparks, NV, and the cause is usually a failed run capacitor. That inexpensive component starts the compressor and fan, fades for years without complaint, and then quits under peak load. It is far from the only suspect, though. Contactors pit and stop passing clean power, condenser fan bearings dry out, small refrigerant leaks drain away cooling capacity, and evaporator coils ice over when a clogged filter strangles airflow.
When the heat goes out, see Furnace Repair.
Signs You Need AC Repair in Sparks
The sooner you notice these red flags, the easier and cheaper the fix. Here are the most common indicators that it's time to call a professional:
- Frost or ice forming on the copper lines or the indoor coil
- A burning smell or repeated breaker trips when the AC starts
- Rapid on-off cycling that never brings the temperature down
- Warm or room-temperature air blowing when the thermostat calls for cooling
- Hissing or bubbling sounds that suggest a refrigerant leak
- Higher summer bills even though the house still feels warm and humid
- Clicking or humming outside with no fan movement
- Water leaking around the indoor unit or from the ceiling below it
Don't Wait for a Total Failure
What seems like a minor issue today can take out a compressor or heat exchanger tomorrow. If you notice any of these signs, call (775) 314-3302 for a prompt inspection.
