Removed old equipment and installed new Rheem 4 ton 18 seer heat pump with 4 ton evaporator coil and 96% gas furnace. Installed new emergency drain pan, new pan safety switch, new coil safety switch, new condensation pump, new thermostat, new composite pad and new line voltage monitor for outdoor unit. Reconnected high voltage, low voltage, drain line, gas line, return plenum, supply plenum and exhaust vent. Tested system operations in heating and cooling, set refrigerant charge.