Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
EnergyPlus is finicky regarding hard-sizing the PTHP airflow, but not hard-sizing the FAN airflow at the same time. (This seems true for all DX coils in E+, not just heat pumps.)
Another consideration: many newer heat pumps operate with good capacity down to 4F (-15C). If yours is such a heat pump, adjust the input for minimum outdoor air temp for compressor operation. Also review the part load performance curves to confirm whether they are a good representation of the actual equipment's performance.
