An outside unit that hums while the fan stays still is the call we get most in July in Baytown, TX, 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.
Heating trouble instead? See Furnace Repair.
Warning Signs for AC Repair
Spotting the early warning signs lets you act before the problem gets expensive. Keep an eye out for the following clues:
- A condenser fan that sits still while the outdoor unit hums
- Cooling bills climbing while the house stays sticky and warm
- Vents blowing air that is barely cooler than the room
- A burning smell or repeated breaker trips when the AC starts
- The system short-cycling every few minutes without cooling the house
- An iced-over evaporator coil or frozen refrigerant lines
- Water dripping from the indoor unit or showing up on the ceiling below
- Bubbling or hissing noises that point to a possible refrigerant leak
Act Before It Gets Worse
Most HVAC failures start small, a weak capacitor, a squealing blower, a system that runs a little longer each week. Call (281) 270-1511 at the first sign of trouble.
