Installing a new 5 ton Carrier Heat Pump. Installed new Eco bee Pro thermostat . Rebuilt and insulated condensate drain line. Replaced secondary drain pan. Installed new filter dryer, pressure tested with dry nitrogen and pulled a vacuum on copper line set. Replaced return plenum and added a 12x12 RFG in back bedroom. Replaced 2 iboxs and ductwork going to the bathroom and back bedroom. Sealed all ductwork connections and buckets with mastic.