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Question on Cool Roof and the way to simulate them in eQuest.

My boss came to me with a cool roof and asked me to do a quick eQuest on it. I
did a 25,000 sf single story office in Los Angeles, saw the roof outside
emissivity was 0.9. ?I changed it to 0.5 and the electric usage went UP. I
change it again to 0.12 and the electric usage went up AGAIN. The HVAC is a
standard single zone pacakge unit with furnace heat.

Am I seeing reality or what am I missing?

Thanks.

John R. Aulbach, PE, CEM