My mechanical engineer buddy got one of those condensing higher heating value 100,000BTU/hr natural gas furnaces that can be vented through PVC, one that can be installed in a trailer home. He opted to install his new furnace trailer style in the basement of his house, where the furnace draws air from out side the house.
That way the furnace is not drawing air from inside the house, which intern does not draw cold air into the house.
I think that would be the bigger efficiency improvement as compared to prewarming the air.
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