I find a good rock concert helps, but I don't think you're looking for things that shift people towards hypomania.

Most of the stuff in there seems to be more about raising the metabolism above the basal state, rather than raising the basal rate itself. Maybe hard to distinguish between the two though, they try to measure bmr in a relaxed state. but things like level of arousal (non-sexual, lol) could make a difference there. I'm not sure I have a basal state when I'm in that natural high.

I think an important question is what the body's achieving with all that energy use? Is increased metabolic rate to heat up the glass of cold water you just drank all that useful?

There are studies where they have people exercise in the cold, it seems to be motivating. Laziness on hot days to avoid overheating sort of makes sense.