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I am no expert but we live in an old (over 100) house and one year we went crazy with the caulk and sealed up every crack and crevice. We decided to close off all the upstairs registers. It was a mess. The windows developed condensation and ruined all the trim paint. Some of the caulk on the storm windows has been taken off and I enjoy the cracks and crevices again. We have insulated windows and the house itself is well insulated. That is enough in my opinion. A house has to breathe. Interesting when people were not so concerned about a 'tight' house I don't recall radon being a threat. Wonder if there is a connection?

As far as temp in the house. Where is the thermostat in relation to the heat runs? It makes a difference as to the heat in the entire house. One room might be warmer than the other and if the thermostat is close to a heat run it may not be accurate. We don't go by temp. We go by if we are warm or not and we don't do the up and down thing. We also run the furnace fan continuously.

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... :)