什么是换气系统？
- 主题发起人 美国车
- 开始时间
- 注册
- 2003-09-30
- 消息
- 79,768
- 荣誉分数
- 23,535
- 声望点数
- 1,373
a/c & furnace only circulate the air inside house. hrv/erv exchange portion of air with fresh air from outside. similar like open your windows but save some enerage during hot summer(erv)/cold winter(hrv/erv)
