well when they start selling electricity in BTUs let me know and I'll change my calcs, but until then my energy balance holds true, just change the numbers to match your situation. I am not going to do this mod to my apartment, because it isn't mind to make changes on, so the numbers mean nothing to me, but having a chemical engineering background I thought I would help others by setting up the equations for them so they could see the possible benefits. I'll remember to keep it to myself next time.
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