I have a three season room that I like to use for all four seasons of the year if possible. It just depends on how cold the days get in the winter.
The only heat source I have in this room is a small wood stove. I bought a fan for the wood stove so I could heat the whole room.
I really have been impressed with the way this has worked. Before this, I made sure all of the chairs were right by the stove to get the most heat.
Now I can have chairs anyplace in this room and know it will be cozy and warm. Another thing I like about it is how quiet it is. The last thing I wanted was to listen to a fan blowing all the time, but I can hardly even hear this when it is moving.