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Maintaining and Servicing

Heat-pump performance will deteriorate without regular maintenance and service. The difference between the energy consumption of a well-maintained heat pump and a severely neglected one ranges from 10 to 25 percent.

Regular Maintenance

• Clean or replace filters regularly (every 2 to 6 months, depending on operating time and amount of dust in the environment).
• Clean outdoor coils as often as necessary (when dirt is visible on the outside of the coil).
• Remove plant life and debris from around the outdoor unit.
• Clean evaporator coil and condensate pan every 2 to 4 years.
• Clean the blower's fan blades.
• Clean supply and return registers and straighten their fins.

Professional Service

• 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.

http://www.eren.doe.gov/erec/factsheets/airheatpump.html

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