11 Energy-efficient and environmentally-friendly systems for residential and commercial use, namely, heating systems comprised of heat exchangers, generators, piping, pumps, and turbines; power systems comprised of heat exchangers, generators, piping, pumps, and turbines; geothermal energy systems comprised of heat exchangers, generators, piping, pumps, and turbines; and ventilation systems comprised of heat exchangers, generators, piping, pumps, and turbines