HVAC Tune-Up in York, PA

Low refrigerant is the most common cause of an AC that runs but doesn't cool. Checking refrigerant pressure confirms the system is properly charged. Low charge indicates a leak — finding and repairing the leak before adding refrigerant prevents the same problem next season.

The outdoor condenser coil sheds heat to the outside air. A coil packed with grass clippings, cottonwood seeds, and debris reduces efficiency and causes the compressor to run hotter. Coil cleaning restores proper heat rejection.

Capacitors start and run the compressor and fan motors. Contactors switch power to the compressor. Both are wear items — a capacitor that tests at low capacitance on the bench will fail during the first extended heat wave. Replacement during maintenance prevents the mid-summer no-cool call.

The evaporator coil drains condensation into a pan and drain line. Algae growth in this drain during the off-season blocks the line and causes the drain pan to overflow — typically into the air handler and the ceiling below it. Flushing the drain line during the spring tune-up prevents this.

A dirty evaporator coil or completely blocked filter causes the coil to freeze — a stuck-on compressor with no cool air. Checking coil condition and filter status at the start of the cooling season prevents the most common AC service call.