Heat-pump maintenance guidance covering filters, indoor and outdoor coils, airflow, defrost, drainage, controls and supplemental heat.
Heat pumps use the refrigeration system for both cooling and heating, so the outdoor unit may operate throughout much of the year.
Maintenance has to consider both modes, including outdoor-coil condition, airflow, controls and defrost operation during winter weather.
Because heat-pump performance changes with outdoor temperature, a system can appear normal in mild weather while a problem becomes obvious during colder or hotter conditions.
Keep normal airflow paths clear of leaves, vegetation and accumulated debris.
Some frost is expected in cold damp weather, but persistent heavy ice may indicate a problem.
Filter, blower and duct condition affect both heating and cooling performance.
Backup heat controls and components should operate as designed when required.
Cooling operation and defrost can both produce water that needs an appropriate path.
Thermostat configuration and staging are especially important on heat-pump systems.
Filters, thermostat settings, visible outdoor-unit clearance, unusual noise, water and changes in comfort are all useful things for a homeowner to monitor. Catching a change early can prevent a minor condition from becoming a larger service problem.
Electrical testing, refrigerant evaluation, combustion analysis, internal equipment cleaning, airflow measurement and safety-control checks should be performed by qualified personnel using the appropriate procedures and instruments.
Use symptom-based guides when the system is already malfunctioning.
Understand the components being maintained.
Learn why filters and restrictions affect system performance.
Use Central HVAC's homeowner planning and evaluation tools.
If you notice repeated cycling, poor comfort, water, ice, unusual odors, abnormal noise or a sudden change in operating performance, maintenance alone may not be the answer. The system should be diagnosed.
Understand what the maintenance task is protecting.
Identify common service parts and components.