Energy.gov recommends
that, "You should also have a professional technician service your heat
pump at least every year. The technician can do the following:
Inspect ducts, filters, blower, and indoor coil for dirt and other obstructions
Diagnose and seal duct leakage
Verify adequate airflow by measurement
Verify correct refrigerant charge by measurement
Check for refrigerant leaks
Inspect electric terminals, and, if necessary, clean and tighten connections, and apply nonconductive coating
Lubricate motors, and inspect belts for tightness and wear
Verify correct electric control, making sure that heating is locked out when the thermostat calls for cooling and vice versa
Verify correct thermostat operation."
Here is the link to more information. We hope that you had a wonderful Thanksgiving!
