Triple glazed Elite 4000 windows from Target Windows and Doors have just become an even better value. We recently changed from 7/8″ glass to 1″ glass. Our entire Elite Product line is now much more efficient in triple glazing than it allready was. Our Power pack triple glazing went from .21U Value (4.8 R factor) to .19U Value (5.3 R factor) a 10% Increase in thermal efficiency!! And not to be outdone, our R5 pack went from a .19U Value(5.3 R factor) down to .17 U value (5.9 R factor) This news along with air infiltration rates as low as .01, brings tremendous value when saving money on utilities, home comfort, sound deadening and overall protection from the elements. A lifetime warranty and low to no maintenance, with unlimited color options gives you the best option for upgrading the windows in your home or light commercial buildings as our windows also carry light commercial ratings. Please visit our website at Targetwindowsanddoors.com