I have 7 windows in my sunroom and they are not very energy efficient; I estimate that I need a U Factor of .28 or better to make my sunroom air tight; in addition, I'll need the southern/western exposed windows to have a low SHGC; are windows with these factors readily accessible in this area?
Tanya H. ~ Landover Hills, Maryland
If you are looking for ways to increase your home's energy efficiency, upgrading your old windows can really help. When you are comparing different windows, you are correct in wanting replacement windows that are energy efficient, having both a low U-factor and a low SHGC(solar heat gain coefficient) value. The U-Factor is a number that expresses the heat loss that a window experiences, and the lower the number, the better insulation value a window has. The SHGC is also expressed as a number, and a low number indicates that the insulated glass is better at deflecting unwanted solar heat.
I suggest that you visit some window showrooms in the Landover Hills Area, and ask to see the different window ratings for the brands they carry. Most manufacturers also put a ratings sticker on their windows which can allow you to compare the energy efficiency of several window models. Replacement windows should help to increase the energy efficiency of your home, and they will probably make your sunroom much more comfortable and enjoyable.