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Is it more efficient to draw furnace combustion air from outside the home?

by LiveModern Webmaster last modified Feb 14, 2013 01:08 AM
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by last modified Feb 13, 2013

I'm installing a new 95 AFUE furnace.



I'm installing a new 95 AFUE furnace.

The efficiency of a 90+ AFUE condensing furnace is not affected by obtaining the combustion air needed from the outside of the house.

However the overall efficiency of the house is....



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