The problem with a 96% efficient gas furnace is in the method they are using to get the efficiency number, I fathom.
The heat loss threw the rear vent would need to be factored in to get a idea of its efficiency. I am not a pro on the subject I feel about 40% ? of the heat is being lost out the back vent. They do breath I am thinking a heat recovery unit off the vent would prove to improve the efficiency number to more of its true potential.
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