The answer to 'how to maintain heat pump' is to regularly clean and inspect the unit, change air filters, and schedule professional tune-ups. This will help ensure your heat pump runs efficiently and lasts for many years.
Start by cleaning the outdoor unit at least once a year, removing any debris or vegetation around it. Check the air filters monthly and replace them when dirty. It's also important to have a professional HVAC technician service the unit annually to check refrigerant levels, clean the coils, and identify any potential issues.