Goodman GPG1348115M41 Air Conditioner, 4 Ton Self-Contained Packaged Furnace 13 SEER - 46,000 BTU Cooling & 115,000 BTU Heating High efficiency compressor Durable, corrosion-resistant aluminized steel tubular heat exchanger Compressor grommets for vibration isolation Copper tube, aluminum fin coils Liquid line filter drier Fully charged R-410A system Redundant gas valve, natural gas and easy conversion to propane Power-assisted combustion Direct spark ignition system, which includes a microprocessor-based control for the entire ignition sequence, all blower operation and all safety circuits complete with self-diagnostics