Installed new 2.5-ton Payne furnace and straight cool condenser. Installed new Honeywell T6 thermostat. Rebuilt and insulated condensate drain line. Added SS2 safety float switch. Installed new filter dryer, pressure tested with dry nitrogen and pulled a vacuum on copper line set. Replaced the condenser pad. Replaced the disconnect and ran the low voltage in Seal-Tite. Replaced the supply plenum with a new and improved 8ft plenum. Sealed all of the duct connections and joints with a mastic airlock.