How do you know when you need new windows? A rule of thumb is, "if you feel air when sitting or standing next to the window, you know that moisture and air is coming through".
Determining the best window to buy depends on a number of factors, including budget. Orientation of the window is another factor to be considered. Windows used to be rated with R-values, the measure of resistance to heat transfer at the center of the glass. The higher the R-value, the better the window’s insulation ability. A new system, the U-value, usually displayed on the window, measures the efficiency of the entire window unit. Typically, U-values range from 1.15 to 0.15. The lower the U-value the less heat transfer between the inside and outside air. Some numerical ratings to look for are Solar Heat Gain Co-Efficient (how the sun warms up the inside of your home) Air Infiltration (resistance to air movement from inside to outside) Design Pressure (how much pressure from window or pressure difference the window can withstand) Water Penetration (how much water the window can withstand) Forced Entry Resistance (how easy someone can break into the window). No matter how energy-efficient a window is, proper installation is necessary to assure that the window performs to its potential. Windows need to be weatherized and insulated when installed. Qualified installers such as our own factory trained ones provide this service.