argon gas windows
I am considering adding a room to my house. It faces south-east so it gets a lot of sun in the morning. Especially in the summer.
I contacted Four Seasons, a company that specializes in sun rooms. The salesperson said the windows were double pane with a coating on the outside layer of the inside window (layer three counting from the outside). He also said they were argon filled.
I subsequently heard that the argon gas can become inert after five years, or leak out of the window. This, supposedly makes the window less efficient normal windows.
I have two questions, first, is this true? Second, does anyone know who makes the windows that Four Seasons uses?