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Another method for heating with electricity involves the use of the heat pump. Every refrigeration machine is technically a heat pump, pumping heat from an area of lower temperature (normally the space to be cooled or refrigerated) to an area of higher temperature (normally, the outdoors). The refrigeration machine may be used to pump heat, in winter, from the outdoor air, or groundwater, or any other source of low-temperature heat, and deliver this heat at higher temperature to a space to be heated. Usually, the heat pump is designed to function as an air conditioner in summer, then to reverse and serve as a heat pump in winter.