This is really special glass I am using here, Jim. The percentage of visible light transmission is guaranteed to be no more than 47% and the UV transmission is only 10%. The shading coefficient is a really low .27 and the relative heat gain is only .32 This is based on how much heat clear glass would transmit. For example, a 1/8" pane of clear glass would be 1, allowing 100% of the sun's heat to penetrate, and the RHG is a whopping 214. The lower the SC and the lower the RHG, the cooler the sunroom. I know these are just numbers and I'll have to see what the "real world" factors will be in all seasons.
