Removed old equipment and installed new 3 ton 15 seer communicating gas system. Installed new return plenum with 16x25x4 filter, new emergency drain pan, new pan safety switch, new coil safety switch, new thermostat, new composite pad for outdoor unit, and new 8” return duct to upstairs room. Reconnected high voltage, low voltage, drain line, gas line, vent pipe, and return ducts. Tested system operations in heating and cooling, set proper charge.