Installed 4 ton Carrier furnace. Installed Ecobee pro thermostat. Installed new secondary drain pan. Installed new return and supply plenums and sealed all connections with mastic. Removed wye and upsized duct going back to office and ran them back to the supply. Ran new thermostat wire. Replaced condenser pad and installed new disconnect and whip. Pressure tested line set and pulled a vacuum. Charged system to meet manufacturer specifications Everything is working at this time.