Our sunroom is very similar--about 14 by 24 feet on the south side of a hundred year old farmhouse. We have more glass on the south wall, and more roof overhang. Our south glass is shaded much of the summer so it doesn't overheat much, and is usable all summer. In the winter we have insulated homemade shades or curtains the cover much of the glass, and with almost no added heat it stays above freezing even if it is 30 below outside. We have a number of black 15 gallon plastic drums in the room for heat storage, but don't really know how much good they do.
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