The water spraying device set up in air-conditioning outdoor machine decreases the condensing pressure of the compressor by the effect of the evaporation cooling of the water. As a result, it induces some effects -- the high-pressure cutting prevention, the improvement in efficiency, and the energy conservation at the peak cooling load. In this article, by the measurement in the operating state, the effect of energy conservation of the air source heat pump chiller by water spraying is verified considering the consumption of water. Moreover, the effect of changing from sensible heat to the latent heat is additionally verified.