The future of windows is here today. At Energy360 our focus is on comfort, energy efficiency, and, of course, great looks. You should know that Energy performance differences, even among Energy Star rated products can be very significant. Utilizing the latest in Heat Mirror® suspended film technology from Eastman/SouthWall Technologies, R values of between R5 and R11 can be achieved. Double pane windows are old technology delivering 20th century performance. You wouldn't invest in a 20 year old computer and you shouldn't accept anything less than superior thermal performance from your new windows.