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Effective passive heaters can be constructed from old sliding glass doors. They are used as the outer face of the "box" which is painted matt black internally. A vent panel strip is at the bottom of the box to allow cold air in, and the box can be leaned against the house. If you have a sash window, it is a simple task to create an exit panel at the top of the box, which sits wedged under the lower frame of your sash window. Thermal air rises and enters the house. These are removed during the warmer months, and can be so constructed as to not detract from the appearance of the home.
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