AC (indoor) not cooling?

A dirty or damaged evaporator heat exchanger cannot absorb heat from room air efficiently, drastically reducing cooling capacity.

Likely causes · most likely first

Heat Exchanger (Evaporator)

Moderate DIY Part: $150–$350
Main PCB

Moderate DIY Part: $80–$200

The main PCB controls compressor demand signals; a faulty board may fail to call for cooling even when the room is warm.
Fan Motor

Hard DIY Part: $40–$90

If the indoor fan motor runs slowly or not at all, warm air cannot pass over the evaporator coil to be cooled.
Cross Flow Fan

Hard DIY Part: $30–$70

A cracked or fouled cross-flow fan reduces airflow volume across the heat exchanger, limiting heat exchange.
Air Filter

Easy DIY Part: $10–$25

A heavily clogged air filter blocks airflow through the unit, causing the evaporator to ice over and stopping cooling.

See the faulty part in 3D.

Tap a highlighted part to see exactly why it fails, how to verify it's the problem, and how to replace it.