When your AC runs and the fan spins but the air is warm — it's usually low refrigerant, a clogged filter, or a compressor that isn't engaging. Run through the safe checks first; if it looks mechanical, call a technician right away.
See if any of these signs match your device — each one increases the likelihood of this fault.
These are the causes we encounter while repairing AC running but not cooling — ranked from most to least common.
Low refrigerant from a leak in the copper lines or fittings
Indoor filter clogged — blocking airflow across the evaporator
Compressor start capacitor weak or burnt out
Outdoor condenser coil clogged with dust and needs deep cleaning
Indoor temperature sensor (thermistor) failing — reading wrong temp
Compressor itself weak — needs proper pressure-side diagnosis
Any of the following = a danger signal — call now and don't try to fix it yourself.
On-site diagnosis, clear pricing before any work, and a documented 6-month warranty.