THE 2-MINUTE RULE FOR A-RATED WINDOWS KIRKBY LONSDALE

A window's rating is determined by a formula which requires into account the total photo voltaic warmth transmittance, the amount of the sun's warmth that may go through the glass (normally called g-value); the U-benefit of The complete window (body and glass mixed), how nicely the window keeps the heat in your home; and also the air infiltrat