Installed new furnace and removed the old one. Put new duct modifications on the supply and the return went right back on. Hooked the venting, gas line, and electrical back up. Put a new T6 WiFi thermostat on the wall. A/C has a new pad and leveled it. Flushed the line set and put pressure on it to 400 psi. Sucked it down into a vacuum to 300. Released the charge and did a start up.