The energy consumption, especially the electricity consumption, of the commercial sector in Japan is increasing recently. Air conditioning system using GHP (Gas fired engine Heat Pump air conditioner) which can promote energy efficiency and reduce the electricity consumption, especially the peak load in the summer, is getting more widely used and can be of a help to preserve the global environment. It is mainly due to the advantages below; · The development of GHP is corresponding to the energy policy in Japan. · GHP is matching to the market needs. i.e. the reduced initial and operation cost. · GHP is "easy to use and install." In this paper we show the trend of the air conditioning system market and the situation of the latest GHP technology development.
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