When underground water is used, there is no need to equip boiler, so there is neither cold or hot wind nor waste gas exhausted into the air and the Heat-Island domino offect of being hotter in summer and colder in winter in the city will not happen.

• 当采用地下水时，不用锅炉，没有冷热风排到空气中，不会产生废气，不会造成城市夏天更热，冬天更冷的热岛效应，如果采用新冷媒，不会对臭氧层造成破坏，保护人类生存环境。