The heavy drapes idea is a great way to help keep the heat from escaping. This winter I put blankets up over large windows and the patio door that had only blinds before. It seems to be making quite a difference. This winter has had alote more heating degree days than last year, 4671 vs. 3989 so far. We have used a few % less propane, and a couple face cords less wood.
You could add some skylights for more direct gain, but you'd need to make insulated panels that close them off when the sun isn't out.
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