Abstract
This paper explains about the technological trend and future view of the room air conditioner. As for saving energy, COP value exceeded 5.9 by planning the increase in efficiency of the compressor, the heat exchanger, and the ventilator. Recently, we work for the development to add functions such as not only the room temperature control, which is the original role of the air conditioner, but also the air purity function. As for the future, the development of technology which cope with the diversification of the user's needs, the reduction of energy consumption, and the coexistence with the global environment will become more important.
