Venting Cathedral ceiling in Florida Keys
I have a metal roof. I only use heat about about 4 or 5 days a year (when it gets below 60). I only use the central air about 30 days a year. The rest of the time my windows are open because I get a nice breeze. I am planning to install drywall on the walls and ceiling. It is quite a bit hotter near the ceiling, because I can tell this when I am on a ladder changing a light bulb. I would like to put insulation in the ceiling, but it would be very difficult to vent it. Since I do not have warm moist air hitting a cool surface will I have a moisture problem if it is not vented? Or will the change in temperature at night be a problem as sometimes there is condensation on the surface of the metal roof in the morning. I know spray foam would work, but the cost is too high. Since I do not use heat or air much, will it be a problem with fiberglass insulation and no venting?