|
Your window is already making your room into an underpowered solar oven. The only substantial improvement you can make to the window is to add clear layers for daytime, and insulate it at night.
You can also use it as a handy opening to duct in heat from a wall-mount hot air collector to increase the effective area. An effective panel in a good location can be made with just polyethylene, lath, and staples. Use lath arches to create a heat-absorbing duct of clear poly over a black back sheet. If it is below the window, it can thermosyphon automatically.
|