We had a Four Seasons Sunroom manufactured by Four Seasons Sunroom of Holbrook, New York which we had to replace.
The concept is poor. The room becomes too hot to be in when the sun is out.
When there is no sun the room quickly reverts to the ambient outside temperature, which is too cold in the late fall, winter and early spring. Because of the low insulation value of the windows it becomes to expensive to heat/cool. After a few years the seals on the windows failed resulting in accumulation of water and green growth between the panes. Four Seasons refused to stand by their product and make good on the warranty, which didn't matter since the room was largely unusable.
We eventually replaced the room with traditional construction, which we now enjoy.
Only the foundation was reusable.
Monetary Loss: $10.
Location: Putnam Valley, New York