It is pretty cold here in Michigan during the winter and we like to save as much money as we can on heating the house.
One tip is to leave the oven door open (or cracked open) when you are finished cooking. Let that heat that has already been made escape into your home and your furnace won't have to work quite as hard.
There would be the same amount of radiant heat as if the door was shut. However, you would not notice a difference as it would escape slowly over time and you would lose some heat to the wall that is behind the stove that could escape elsewhere. It gives you a higher until rate of radiance over time when open.
My brother-in law Joe also suggests shutting the oven off early in the Summer and letting the food cook so you get the most out of the heat output. Great idea!
Actual savings? I don't know. But it has to help!