Removed and installed new Rheem gas furnace with 3.5 ton a/c unit and 4 ton evaporator coil for upstairs. Installed new return plenum with 20x25x4 filter, new emergency drain pan, new pan safety switch, new coil safety switch and new composite pad for outdoor unit. Reconnected supply plenum, all return ducts, high voltage, low voltage, drain line, gas line and vent pipe. Tested system operations, set proper charge. Removed and installed new Rheem gas furnace for left side of main level. Installed new emergency drain pan, new pan, safety switch, new coil safety switch, new condensation pump, and new media filter cabinet box with 20x25x4 filter. Tested system operations.