I live in the northeastern U.S., and have a 12 x 16 sun room. It's maintenance free, and the inside walls are vinyl aluminum siding. There are 4 windows on one wall, and 4 on another wall, which are about 3' x 5'. The ceiling is perforated soffit, which allows the room to "breath". I'm considering replacing the ceiling with an insulated drop ceiling, and placing an electric heater out there. Without the perforated ceiling, I should loose much less heat. My question is, without the perforated ceiling, would I have to run a heater out there all winter long, or risk condensation? I don't want to get into a situation where I have to heat the room for 23 hours a day, so I can use it for 1 in the winter.
-Thanks