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Just some thoughts: the SGHC input to the energy use output has numerous factors between: sizing, airflows, equipment efficiency curves, solar heat gains to offset heating loads, 62.1 outdoor air calculations, etc. It is best to understand how the room itself was affected first, then chase those differences downstream. The main elephant in the room is the ASHRAE Heat Balance method, and how the change in SGHC impacted a room's ability to absorb radiation.