I think the key is consistency, and I don't mean necessarily one temperature. For example, if you consistently have a 2-3 degree temp swing, that's probably OK, but the problem is when your AC breaks or something else happens to make the temp swing larger (or perhaps smaller).
I actually think there's something to be said about small regular temp swings. I was thinking about programming one into my apex, to hit a low of 77.5 in the middle of the night (2AM) and 78.5 at 2PM. Currently it's set to 77.7-77.8, and fluctuates from 77.6-78...
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