An air conditioner blowing warm air out of indoor supply vents is typically affected by one of several common mechanical failures. First, a severely dirty, clogged air filter chokes airflow, causing evaporator coils to freeze into solid ice blocks. Second, low refrigerant levels from a hidden leak prevent heat absorption. Third, a dirty outdoor condenser coil stops heat release. Fourth, a broken compressor capacitor prevents the compressor motor from engaging. Verification: Hold your hand up to supply vents to check air temperature and inspect your indoor air filter.
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