Why do gas furnace efficiencies jump from 80 percent to 90 percent?
A) The physics of combustion make it impossible to produce an 85 percent efficient furnace.
B) Federal regulations do not allow the production of mid-efficiency furnaces.
C) The blower used with 85 percent furnaces cannot be used for air conditioning.
D) By installing a recuperative coil ahead of the main heat exchanger.
D
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