若有預算可參考網友的建議安裝全熱交換器http://tayouhome.pixnet.net/blog/post/18659258-%E5%A6%82%E6%9E%9C%E5%8F%AF%E4%BB%A5%E9%87%8D%E4%BE%86%E4%B9%8B%E9%9B%BB%E5%99%A8%E7%AF%87-2.%E5%85%A8%E7%86%B1%E4%BA%A4%E6%8F%9B%E6%A9%9F(ii)