REBATES, TAX CREDITS & ENERGY SAVINGS

A measure of the rate of non-solar heat loss or gain through a material or assembly. It is expressed in units of Btu/hr-sq ft-ºF (W/sq m-ºC). Values are normally given for NFRC/ASHRAE winter conditions of 0ºF (18º C) outdoor temperature, 70º F (21º C) indoor temperature, 15 mph wind and no solar load. The U-factor may be expressed for the glass alone or the entire window, which includes the effect of the frame and the spacer materials. The lower the U-factor, the greater a window’s resistance to heat flow and the better its insulating value.

The fraction of solar radiation admitted through a window or both directly transmitted or absorbed and subsequently released inward. It is expressed as a number between 0-1. The lower a window’s solar heat gain coefficient, the less solar heat it transmits and the greater its shading ability. Our windows are designed to keep you comfortable during the hottest months of the year while protecting your carpets, drapes and furniture from fading & discoloring from sun exposure. 

The measure of the resistance of a glazing material or fenestration assembly to heat flow. It is the inverse of the U-factor (R = 1/U) and is expressed in units of hr-sq ft-ºF/Btu. A high-R-value window has a greater resistance to heat flow and a higher insulating value than one with a low R-value.  Original windows have R-Values of 1-2 while Parallax performs at 4-6! 

The percentage or fraction of the visible spectrum (380 to 720 nanometers) weighted by the sensitivity of the eye that is transmitted through the glazing.  Our w  is expertly engineered to block unwanted heat gain, help prevent fading & discoloring of carpets, drapes & furniture while keeping your home beautiful and bright!