[masraum]

I don't have any data to back this up, but I think the way to go would be too decrease the temp in the front part of the house at night, but don't completely turn the heat off.

I think to get it right it will require some experimentation. I suspect the appropriate change in temp depends upon some factors: how big the space is that needs to be heated, how well insulated it is, how quickly it cools off, etc...