Real Life Numbers

Had to shut off the workshop for a month. 850 sq ft that I didn't have to cool to 82°F with the average ambient temperature of 92°F resulted in $75 savings on the electric bill.

Of course, this number is not exact by any stretch of imagination, but it'll give you a good ballpark of what your actual HVAC expenses are, and give you some food for thought about the actual ROI on your HVAC related investments.