"I'm with you on this one PJ (for once!). All else being equal (or equally bad), setback has the potential to save more than downsizing source equipment, although if the AC is grossly oversized, say, 200% or more, who knows. It's true that…"
"Ted, by saying that homes that benefit from setback are somehow broken, you're making a huge generalization, and one that flies in the face of physics and common sense. You wrote: I ask how much and they say "a lot". I can't…"
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