Trying to do more with the sun, which comes out enough to make it worthwhile. The southern exposure of the house, pictured below, is a glass room (720 sq. ft by 11' ceiling) containing a seldom-used pellet fireplace. Let me start off giving some numbers pertaining to the most drastic month, and assume heating the room just gets easier from there. In the morning the temperature can be 20-degrees inside and out depending on the wind. On any clear Winter day, as the sun is positioned lower, by 10am the room temperature is 50-degrees. By noon, temperature is 75 to 80-degrees. At that point, a whole-house fan moves the heat across the attic, down into the rest of the house. To me, this makes heating a glass house not so ineffecient.
The next project is a solar panel. Insulated a 6" 4' x 8' box with an old sliding glass door on the top. Opened and layed around 250 aluminum cans in rows end-to-end. It's mounted on the side of the barn roof in an attempt to heat a guest room in hay-loft. After an uninsulated 25 feet, through a bath fan, air maintains 75-degrees.