furnace blowing all the heat up the chimney
DT wrote:
....
For starters, is the rerun air ducted, or is it an open return system?
More to the point might be are the hot air runs insulated and/or in
unheated spaces (like attic/crawlspace) or is there a break somewhere
(like a flexible boot at the plenum outlet?) or a closed internal damper
or, or, or, ...???
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