Is it cheaper to use a window unit other 2 rooftops ?
Would it be cheaper go with a window unit or just use the two roof top units already on unit?
Forum Discussion
Perhaps the OP was thinking about the effect of the sun shining directly on the exterior of the AC unit sitting on the roof? Just speculation... (And they're white, and designed for it... I doubt there would be much difference. Best way to save electricity - which is not necessarily the same as saving money - is to turn it to a higher temp setting, or not run it at all.)
