Hello all. After finalizing my building and obtaining what appeared to be reasonable output, I removed the ERV devices (modeled at 85% efficient cross-flow air to air heat exchangers) from the model to ascertain the energy savings attributable to those devices.

And my total energy consumption went DOWN over 6%! Inexplicably, 'space cooling' and 'pumps & aux.' energy consumption has decreased by a far larger amount than 'space heating' increased. I would have expected both of those values to increase along with the 'space heating' energy consumption (which did increase).

Anyone have any idea why that might be?

Andrew Clagett, PE, LEED AP