An air conditioner blows warm air when the cooling cycle is interrupted by a settings error, airflow restriction, power loss to the outdoor unit, or a refrigerant problem. The most common cause is an incorrect thermostat mode or a clogged filter that starves the system of air. Our technicians see this often in the Las Vegas area during peak heat. If the indoor blower runs but the outside fan sits still, the system is circulating room-temperature air instead of cooling. Try simple checks first; if temps don’t improve after a short reset, schedule repair to prevent bigger damage.
Quick things to check now:
- Thermostat set to Cool with Auto fan (not On) and a target below room temp
- Dirty air filter or blocked return grilles restricting airflow
- Tripped breaker or outdoor disconnect preventing the condenser from running
- Ice on refrigerant lines or coil, which points to airflow or charge issues
Turn the AC off if you see ice or suspect a refrigerant leak to avoid harming the compressor.
Updated: 2026-08-25
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