ninevah and I are warm-blooded beings. We like to keep the thermostat lower and either put on the layers (me) or be comfortable (him). Boo seems impervious to cold since he's always in motion.
Since the snow hit this weekend, I conceded and moved the thermostat from 66F to 68F.
Think about it, though. It's -6F outside right now, with a windchill, and I've only got the inside temp set to 68F.
With the old windows and doors, I'd have had to crank the temp up to 74F or plus and it would still have been drafty and cold. Granted, we're still a bit chill in here (that's what little to no insulation in the walls will do), but it's dealable.
New windows and doors - Best money I've spent in a long time.