?What assumption can be made when using heating degree days to estimate seasonal energy consumption?
A. ?The number of heating degree days each month is the yearly total divided by 12.
B. ?Heating is needed if the average monthly temperature falls below the historical average for that area.
C. ?Heating is needed if outside air temperature drops below 65° F.
D. ?Heating is needed if outside air temperature drops below 55° F.
Answer: C
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