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Here's the thing: You'd save significantly by setting it to 25deg. when cooling and 19deg. when heating. Both are very comfortable once you've adjusted for a day or two - after that, going to 23deg. actually feels wrong (either too cold im summer or way too hot in winter).

Don't underestimate the thermal power needed for just one additional degree in a typical American house with poorly insulated windows, walls and doors.

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