Installed Daikin DZ20VC0481 variable-speed heat pump for whole-home cooling. Removed old system, installed new pad, and secured outdoor unit. Installed Daikin DVPEC060 air handler with ECM motor. Connected refrigerant lines, evacuated system, and charged with R-410A. Programmed Daikin One+ thermostat for optimal comfort. System achieved 20 SEER cooling efficiency.