AC blowing warm air
The fan runs, the house warms up anyway. Work down this list from the top; the first few take a minute each.
Checks you can do
- 01
Thermostat mode and setting
Set to cool, fan on auto, and below the room temperature. A dead battery can blank some models.
- 02
Filter
Hold it to the light. If you cannot see through it, airflow is choked.
- 03
Breaker and disconnect
The outdoor unit has its own breaker and a disconnect box on the wall beside it. Either can be off while the indoor fan still runs.
- 04
Outdoor fan
Look at the top grille while the system calls for cooling. Still, humming or slow means a call.
Causes that need a contractor
- 01
Failed capacitor or contactor
The outdoor unit gets no start or no power.
- 02
Low refrigerant
A leak somewhere in the coils or lines. Warm air plus ice on the suction line is a classic sign.
- 03
Dirty condenser coil
Heat cannot leave, so the compressor trips on high pressure on the hottest afternoons.
- 04
Compressor failure
The expensive one, and the point where replacement enters the conversation.
Afternoons are the test
Many systems here cool fine in the morning and fall behind after 3 p.m., when the condenser is working hardest against outdoor heat. If yours keeps up at night and loses ground each afternoon, mention that pattern; it points toward coil, charge or capacity rather than a dead part.
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Talk it through with an HVAC contractor
Say what the equipment is doing and how old it is. An independent contractor who works in Henderson, Nevada takes it from there.