Definately check to see what you have for insulation in the walls and roof of the sunroom. Also, are they good, tight, modern windows, or old drafty ones?
What is the sunroom over? Is it over basement, crawlspace, or concrete slab? This will effect how it heats.
Your cousin adds thermal mass? How much does he weigh!?!?!?
A relative of mine has an old house with a "sunroom" on it which was originally a front porch. It is poorly insulated, and has nothing under it. They just close it off completely in the winter because it would otherwise suck heat from the house.
Could you see a woodstove in your future? Not sure how close to town you are, but a stove in the south-east corner of the sunroom would put the chimney on the prevailing downwind side of your house.
If the sunroom is on a concrete slab, run a wood stove continuously for about 3 days, on the 4th day your floor will be totally warm all day whether you run the stove or not. It's a neat feeling.
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Last edited by bennelson; 10-02-08 at 09:11 AM..
Reason: thinking about stoves.
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