HVAC
AC blowing warm air: what to check first
Work the free checks in order — thermostat mode, filter, breaker, outdoor unit, frozen coil — then stop. Refrigerant and electrical repairs are licensed work.
Beginner About 25 minWhole homeCare needed
Video: Key Fob Rob (YouTube) — hand-picked by Xiane and matched to the written steps below.
Never open the sealed refrigerant system or the electrical disconnect. Refrigerant handling requires EPA certification in the United States.
Steps
Tools
- New filter
- Garden hose for a gentle coil rinse
Parts
- No parts required.
Published February 10, 2026 · Last reviewed September 1, 2026 · Next review March 1, 2027 · Source: Video: Key Fob Rob (YouTube)