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Thanks for the comments.

I'm not exactly sure what a heat run is....but the thermostat is in the livingroom, and the furnace is in a utility room (close by but separated by a wall).

The house is a 1950's. I'm renting right now since I might move back to my home state in the next year or two.

So, I'm basically just trying to save on the heat bill and be as warm as possible while saving money (if that can be done??).

It's a small house, and every room gets pretty chilly during the night. As I said, even with the unit set down to 63 degrees, it still cuts on and off many times during the night.

If it's going to do that, I see no cost benefit in cutting it down...might as well leave it on 72. But maybe I'm missing something. I'm sure not knowledgeable about heating units. Just thought I'd try getting the answer here.

If there's no savings, I'd love to leave it on 72! But my mind wants to know FOR SURE that I wouldn't be saving any money by keeping it set at 63... :)

It sounds like poor insulation for one thing but here are some considerations. In the day time you have less load on the unit usually due to sunlight and outside temps being warmer. With what you are describing the thermostat may not work as well at 63 and to be honest you save no money going that low. The furnace will have to compensate the next morning to get the temps back up meaning an extended run time. Try 68 and see what happens. That may increase the cycle times. You didn't say what type of furnace or if it's central heat and air etc. If it is a heat pump by all means keep it about 70 at night to let it run longer and cut on and off less frequent.

Here's some advice for people with Central heat and air. Do not close off registers in unused rooms or completely shut off any room. There should be about a 2 inch gap at the bottom of the door for air return on closed doors.

You can damage your unit and shorten it's life doing so especially on the cooling cycle or either cycle on a heat pump. It needs the return circulated air to function properly.