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TCAAP Energy Integration Resiliency Framew ork <br />Policy White Paper – Energy Supply Alternatives <br /> <br /> 27 <br />with a reversing valve near the compressor. This allows for the air source heat pump to operate as a <br />heating unit during the winter time. <br />Air source heat pumps can be installed in most regions of the U nited States with increased efficiencies <br />during many months out of the year. Air source heat pumps are best suited in relatively moderate <br />climates, such as the south-eastern United States. In colder climates, such as TCAAP, electric resistance <br />heating is necessary to aid in preheating th e air before going through the heat pump to achieve <br />desirable supply temperatures. This process of preheating reduces overall efficiency of the air source <br />heat pump, dropping its economic viability. While the capital cost for air source heat pumps are <br />currently not exorbitant, TCAAP’s climate will hinder overall efficiency of the system during the winter <br />time.