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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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