When planning your sunroom, first consider how you want to use your room. That will help you make the decision between a 3-season or 4-season addition. The benefit of a 4-season room is having extra space all year round to entertain or for your family to spread out. But if you just want a special place to enjoy the warmer months, then a 3-season sunroom provides what you need.
One of the biggest differences is a 3-season room doesn’t need insulation; a 4-season room needs to retain heat in the winter so that it can be used all year. A heating and cooling unit can be added to a 3-season sunroom to take the edge off of extreme temperatures, but it’s more efficient for temperature control year-round in the insulated 4-season room.
The type of glass differs as well, with single pane windows typically being installed in a 3-season sunroom and a 4-season room having more energy efficient windows throughout.
Even though there are construction differences, the decision to have a 3-season sunroom or a 4-season sunroom ultimately comes down to how you want to use your extra space.