Install new gas furnace in existing location. New Furnace height is taller due to having a Coil housing. Install new Plywood to build up floor base. Convert furnace to propane if required. Complete connections of return and supply ducting. Reconnect gas piping and test for leaks. Install new Roof Jack and seal roof around flashing. Test operation and fill out form for new installation, provide homeowner instructions, and clean up work area.