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In the past, controlling the temperature by means of heating with a heater has regulated the fall in temperature brought about by dehumidification caused by weak cooling operation. With the new system, however, any sensation of excessive cooling has been resolved by the adoption of an independent cooling cycle system under which cooling and heating operation are performed simultaneously. This has made it possible to do away with the electric heaters, which have been used in the past for reheating purposes, thereby making a significant contribution to reducing energy consumption and achieving lighter weight.