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I am running an analysis on a house for a NZE webinar. I have created a building envelope which is common to all the iterations (modelling runs). All that I am varying is the different variety of heat pump systems (ducted, ductless, Geo, etc.). The peak heating loads are all the same (52 MBH) regardless of system type. The cooling loads are all over the place (lowest @25 MBH, highest at 46 MBH). I realize that there will be a little variation on peak cooling load due to fan energy differences, but these differences are way beyond that. Same ERV in all models. I am selecting the stock equipment in the library without alterations. Anyone have an idea what what be causing these differences?

I am running an analysis on a house for a NZE webinar. I have created a building envelope which is common to all the iterations (modelling runs). All that I am varying is the different variety of heat pump systems (ducted, ductless, Geo, etc.). The peak heating loads are all the same (52 MBH) regardless of system type. The cooling loads are all over the place (lowest @25 MBH, highest at 46 MBH). I realize that there will be a little variation on peak cooling load due to fan energy differences, but these differences are way beyond that. Same ERV in all models. I am selecting the stock equipment in the library without alterations. Anyone have an idea what what be causing these differences?