I modified an idf file (single family residential prototype) to create a baseline and proposed case. I just changed out the HVAC system so one model has a gas furnace, the other a ducted heat pump,I left everything else the same.
models both run fine with minimal warnings and no errors. however, all CSV results produced are exactly the same. The difference in the idf files (and the sameness of the CSVs) has been verified through direct text comparison.
for an extra bit of oddness, the html table results are different and show the expected annual results (ie all electric heat in the HP retrofit results). also, only one *.err file and one *Zsz.csv file remains in the run directory after simulating both files (files are in the same directory).
Using EnergyPlus 8.9.0
