You need to find out what kind of heating system first.

來源: newplayer 於 2010-02-04 05:42:51 [] [舊帖] [給我悄悄話] 本文已被閱讀： 次 (107 bytes)
Basiclly, there are three type of systems for US residence building, Gas Furnice, Heat Pump and Oil system.
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