16 at night (which is admittedly a bit cold), 17 during the day when we're not home because my dogs are sissies, and 20 when we're home. I might bump the overnight temperature up to 17 as well.
I read somewhere (can't recall where), that even though the furnace has to run a bit to get it up to 20 again, it is still more efficient than maintaining that temperature all day when the house is empty. I'd be interested in seeing something to back it up though.
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