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One of the major problems with exploitation of air heat pumps (ASHP) in the cold season, is frosting of outdoor heat exchanger?s surface. A layer of frost accumulated on its surface, leads to decreased heating performance and energetic inefficiency. To restore the ASHP?s nominal capacity, a defrosting process needs to be conducted periodically. The necessity of this procedure causes penalty energy usage, decreasing already low COP in result. Analyzing commonly used ASHP systems, some possibilities of energy effici...