Dirty filter or blocked airflow
A clogged filter chokes airflow and can cause the evaporator coil to freeze. Replace the filter, open all supply vents and make sure nothing blocks the return.
Thermostat settings
Check that it is set to cool, the fan is on auto, and the setpoint is below the room temperature. Dead batteries in the thermostat can also cause strange behavior.
Frozen evaporator coil
Ice on the indoor coil or refrigerant lines means airflow or refrigerant is off. Turn the system off and let it thaw before running it again. Running it frozen can damage the compressor.
Dirty outdoor unit
The outdoor condenser has to shed heat. A coil caked with dirt, cottonwood or grass clippings cannot, and the system struggles. Keep two feet of clearance around the unit.
Low refrigerant or a failing part
Refrigerant does not get used up. If it is low, there is a leak. A failed capacitor, contactor or compressor can also stop cooling. These need a licensed technician.
Need a hand?
If it is more than a simple fix, we are a call away in Clifton and nearby towns.