Installed Carrier Heat Pump. Used installed Honeywell thermostat. Installed new extended supply plenum and new return plenum. Re decked wood that had water damage. Replaced secondary drain pan. Rebuilt and insulated primary and secondary drain line. Installed Safety Float switches. Reattached all ductwork and sealed with mastic. Cleared drain and verified operation. Pressure tested lineset and pulled a vacuum. Replaced disconnect and whip. Tested and charged system. Installed condenser for downstairs system and began removal of downstairs air handler. Installed downstairs air handler. Used installed Honeywell thermostat. Rebuilt primary drain and cleared to verify operation. Installed and tested SS2. Installed new transition to supply plenum. Sealed all connections with mastic. Pressure tested lineset and pulled a vacuum on the lineset. Charged system and tested operation. Everything is working at completion of service.