Installed a new Carrier 25VNA8 high-efficiency air conditioning system with Performance Boost two-stage compressor and Infinity communicating control board. Replaced existing air handler with Carrier FV4C N08 variable-speed ECM furnace. Ran new refrigerant lineset of 3/8" liquid and 7/8" suction lines using Webstone LineSet Cover. Fabricated new plenum transitions for existing ductwork using Stamford Shortbody elbows. Evacuated to 500 microns using a Fieldpiece EVAC4WAY vacuum pump. Charged with Carrier-supplied R-410A refrigerant per data plate. Installed new programmable Infinity Zone Control wifi thermostat and enabled ComfortHeat Staging to maximize efficiency.