Why do gas furnace efficiencies jump from 80% to 90%?
A) Federal regulations do not allow the production of mid-efficiency furnaces
B) The physics of combustion make it impossible to produce an 85% efficient furnace
C) Efficiencies over 80% cause condensation but the flue gas is still too hot for PVC vent pipe until the efficiency reaches 90%
D) The blower used with 85% furnaces cannot be used for air conditioning
C
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