The three season sunroom is the basic sunroom. Its name comes, as you might have guessed, from the fact that the room is generally usable for all seasons except winter. As opposed to a four season sunroom, the three season is NOT connected to the home’s heating and air conditioning system. The benefit of this is lower costs for construction, like no insulation, cheaper uninsulated windows, and an overall more basic approach to framing. Some manufacturers actually sell do-it-yourself kits for three season sunrooms.
A problem with this type of sunroom is that as sure as it will get cold in the winter, it can also get very hot in the summer, as the glass windows or walls actually act as a solar energy collector, bringing heat directly into the room. Therefore many sunroom owners utilize portable climate control devices—heaters, window AC units, and ceiling or area fans—to make things as comfortable as possible for as long as possible.
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