Use this HVAC preventive maintenance checklist to standardize inspections for air conditioners and heat pumps. Record model and serial numbers, verify thermostat accuracy, check voltage and amperage draws, test capacitors and motors, measure superheat and subcooling, and assess refrigerant levels. Inspect coils, piping insulation, condensate pans and drains, electrical connections, contactors, and safety shutoffs. Test cooling and heating modes, defrost operation, blower performance, and filter condition to ensure reliable building comfort and efficiency.
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