Conducted seasonal maintenance on Daikin DX20VC heat pump. Cleaned condenser coils using SimpleAir S-19 coil cleaner. Verified refrigerant charge with Fieldpiece SMAN360 digital manifold. Inspected and tightened electrical connections. Replaced air filter with Nordic Pure MERV 13 pleated filter. Cleaned condensate line using BioFresh drain tablets. Lubricated fan motor bearings with CRC 03080 Power Lube. Calibrated Daikin One+ smart thermostat. System now operating at peak efficiency with 19°F delta T.