Customer requests a plumber for more information on solar water heating. Plumber is set to meet with the customer tomorrow afternoon. Super tune up performed today on a Trane heat pump with air handler installed in 2019. All electrical connections are tight with no corrosion. Blower wheel has some slight build up starting to form. Biological growth is present inside of the air handler. Suggest adding UV to sterilize the air handler and keep it clean. Compressor and condenser fan motor are acceptable. Fan capacitor is weak and needs to be replaced. Primary electrical control is showing a voltage drop across the coil and needs to be replaced. Refrigerant levels are in range. Outdoor unit was washed and waxed. Suggest adding a compressor saver to help with the efficiency and reliability of the system. Customer declined any repairs at this time.