04:06PM | 11/18/09
Member Since: 11/17/09
3 lifetime posts
I have an almost 19 year old gas furnace. This week I had a maintence service done on it. It works fine but the repair person told me that I might want to consider a new furnace given the rebates since mine is now probably about 65% efficent. He told me that the efficiency of a furnace degrades oveer time, it was 78% efficient when new. Any truth to this? I've been unable to find any supporting or cotradictary info on the web.


08:43AM | 11/20/09
Member Since: 11/19/09
1 lifetime posts
A furnace will/should not drop in efficiency unless there is a restriction with soot or something else that restricts the flow.

The newer units are 80 to 90% efficient depending on the model you buy.

Hope this helps!

Sun Devil Plumbing - AZ

(480) 559-8090
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