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When inputting the efficiency of the HVAC system, ensure the value entered is consistent with the type of system being modeled. If it is small furnace, the value would be an AFUE that is in the range of 0.7 to 1.0, while a small heat pump would have an HSPF in the range of 7 to 12. Double check that you have entered this value correctly by selecting the HVAC system in the System level of the Building Tree and reviewing the inputs in the heating and cooling tabs.
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