Hydron Module Revolution HXT series geothermal heat pumps are up to 500% efficient, says the firm. A foamed-in heat exchanger prevents condensation, and quadruple compressor isolation reduces noise. The multi-positional cabinets can be field-converted from upflow to downflow, and they can be installed in right-hand or left-hand return-air configurations. All three models, ranging from 4 to 6 tons, use R410A refrigerant and are Energy Star rated. 800.720.1724.