What was the aproximate % efficiency of regular contractor grade furnaces in 1991. I do not know make or model.
Furnace
Aug 25, 2004
5 Replies
I believe it was about 80%
80% at best.
Talking about GAS right?? Oil could be lower than 80%
Normally, metal flu pipe and it would likely be 80% (Builder Grade)
If, and that's a big if, it has PVC flu, it would be around 90%+ (Premium Grade)
~kjpro~
Speakin of..man..you GOT to see the new York concentric vent for the 90%+ units....freaking rocks..
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