In general, it is recommended to have a heat pump serviced annually. Regular maintenance is essential to maintain the efficiency of the heat pump, extend its lifespan, and identify possible issues early. Here are some aspects of heat pump maintenance:

1. Annual Inspection:

   • A professional installer or technician should inspect the heat pump annually. This includes assessing the overall operation, checking electrical components, measuring pressures and temperatures, and inspecting critical parts.

2. Filter Maintenance:

   • Filters in the heat pump should be regularly checked, cleaned, or replaced. Dirty filters reduce efficiency and can damage the system.

3. Checking Refrigerant Level:

   • The refrigerant level should be checked and refilled if necessary. A low refrigerant level can decrease the efficiency of the heat pump.

4. Cleaning Evaporators and Condensers:

   • Evaporators and condensers need to be cleaned periodically to prevent the build-up of dirt and dust, allowing for more efficient heat exchange.

5. Lubrication of Moving Parts:

   • If necessary, moving parts such as fans should be lubricated to reduce wear and tear.

6. Checking Electrical Components:

   • All electrical components should be checked for proper operation, including wiring and connections.

7. Checking for Leaks:

   • Technicians should check for leaks, especially in the heat pump's piping system. Leaks can reduce efficiency and jeopardize the system's reliability.

8. Checking Airflow:

   • The airflow through the system should be checked and adjusted if necessary. Proper airflow is essential for efficient operation.