如果只是为了每年省$400， 冬天室内太冷， 夏天太热， 实在没有必要， 如果是为了环保， 那又另当别论 :)

所有跟帖： 

• 羊城姐好！不仅仅是省钱。Summer air-conditioning puts a unbearable demand on -煮鸡蛋- ♂ (0 bytes) () 07/15/2019 postreply 20:23:49

• the national grid, and is one of the most significant areas of e -煮鸡蛋- ♂ (0 bytes) () 07/15/2019 postreply 20:24:47

• energy wastes. Power grids in summer can break down due to HVAC. -煮鸡蛋- ♂ (0 bytes) () 07/15/2019 postreply 20:26:09