he said our filter is very clean. but he did suggest

来源: 洋葱头儿妈妈 于 2010-02-08 15:06:16 [] [博客] [旧帖] [给我悄悄话] 阅读数 : 0 (286 bytes)

that we use a cheaper filter b/c it is thiner.

our heating bill in Jan was quite similar to last year's. it is somewhat colder this year. but it is hard to imagine that would make a huge difference. last year in Feb our gas consumption was almost exactly the same as this Jan.

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