When an air conditioning system or heat pump is running in cooling mode and blowing cold air, but the house remains hot, it usually indicates that the cooling capacity of the unit is overwhelmed by extreme heat gain or restricted by airflow problems. Common causes include a severely clogged air filter that chokes airflow across the indoor coil, dirty outdoor condenser coils that prevent heat rejection, or low refrigerant levels from a leak that severely impair cooling efficiency. Additionally, if the system is improperly sized for the square footage of your home or if windows and doors are left open during a severe heat wave, the unit cannot keep up with the thermal load. You can troubleshoot by replacing dirty air filters, clearing debris from the outdoor unit, and checking refrigerant pressures. You can verify resolution when indoor temperatures begin dropping steadily.
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