Abstract: A method and equipment for increasing the efficiency of a heat pump is the subject of the present invention. The method comprises providing an underground pathway for air travel, forcing a quantity of air through the pathway for operation of the heat pump, and directing air emanating from the underground pathway to the heat pump inlet. The equipment of the invention comprises a heat pump, an underground conduit presenting an elongated path for accommodating the flow of air therethrough for heat exchange purposes with the earth, with the outlet of the underground conduit being disposed for directing air toward the heat pump.

Abstract: A method and equipment for increasing the efficiency of a heat pump is the subject of the present invention. The method comprises providing an underground pathway for air travel, forcing a quantity of air through the pathway for operation of the heat pump, and directing air emanating from the underground pathway to the heat pump inlet. The equipment of the invention comprises a heat pump, an underground conduit presenting an elongated path for accommodating the flow of air therethrough for heat exchange purposes with the earth, with the outlet of the underground conduit being disposed for directing air toward the heat pump.

Abstract: An underground conduit extends through the soil in two parallel stretches and connects at one end with a return duct and at the opposite end to the air intake of a heating and cooling unit. The return air duct may be closed off by a damper so that the return air is diverted through the underground conduit. The underground conduit may also be coupled with a forced air unit which is independent of any heating and cooling system. An air diverter in one stretch of the conduit recycles air through the conduit while a portion of the air is utilized. The constant temperature of the subterranean region results in the circulating air in the underground conduit being heated in winter and cooled in summer. To increase the air turbulence and the effectiveness of the heat transfer, the conduit may be corrugated. Sand may be packed around the conduit to retain moisture for more effective cooling.