I thought only commercial HVAC has fresh air while residential central air conditioning & heating systems are closed. Is this not the correct understanding?
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【在 b*****e 的大作中提到】 : HVAC系统会有新空气进来,然后过滤的
f*s
22 楼
湘江水逝楚云飞,除了热烈的红色,还有什么颜色更适合心直口快,开朗豪爽的湘云呢?
s*a
23 楼
外面零下30度,从外面吸风,里面能暖和起来吗?
f*s
24 楼
再回顾一下钗,黛,湘三人的主色调吧: 贴完了,撒花...
n*s
25 楼
You are correct.
【在 b****n 的大作中提到】 : I thought only commercial HVAC has fresh air while residential central air : conditioning & heating systems are closed. Is this not the correct : understanding? : : [发表自未名空间手机版 - m.mitbbs.com]