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which dual pane vinyl window insulates best: low e with argon (simonton) or low e squared w/o argon (polybau)?
Simonton offers a dual pane replacement window with low e and argon gas between the panes. Polybau offers something called low e squared without the argon gas. Which window will have the best insulating values? I am not able to get a 'straight" answer from distributors/salespersons.
Public Comments
- These two features work in different ways.
Low e glass has a sputtered coating of a metal such as copper to reflect back long-wave infrared energy from the sun during the summer. Short-wave radiated energy would be transmitted thru the glass. The sputtered coating never wears out.
Argon gas is used to fill the space between the glass panes, and is more efficient than air at blocking the transmission of heat or cold from one pane to the other. However, the argon eventually leaks out of the seals - perhaps 5 or 10 years.
Compare the U ratings for each type of window to decide which one is superior. Make sure everything is equal: glass thickness and spacing, as well as the frame material (wood, PVC, fiberglass, etc.)
Simonton's explanation about low-e and argon filled windows:
http://www.simonton.com/architect/glass/lowe/default.htm
- They will both insulate equally.The gas prevents the window from fogging up between panes
