<p>: The present invention relates to an enclosure which surrounds the compressor portion of a heat pump and which increases the efficiency of the heat pump by the use of solar energy. The enclosure is comprised of an insulated wall structure which surrounds the compressor of the heat pump and a solar energy receiver which is located in the wall structure. The receiver includes a window and a plate which define a warm air passage. A duct unit is provided for directing warm air from the passage over the heat pump. A fan is located in the duct unit for moving the warm air.</p>
