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