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Old 10-28-2009, 08:49 AM   #1
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Anderson Windows Code


I have some Anderson Windows that are about 35 years old. I would like to find the energy efficency rating of these windows by using the code found at the traiangle on the window. Where can I find a chart that will give me the rating for these windows. The codes that I have on these windows are AW, M, IF, XI. Thanks for your help.

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Old 10-28-2009, 09:25 AM   #2
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Anderson Windows Code


John....Google is your friend.

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Old 10-28-2009, 12:07 PM   #3
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Anderson Windows Code


Does THIS help any?
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Old 10-28-2009, 03:56 PM   #4
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Anderson Windows Code


I would guess if they're that old, and double-pane then they are likely R2. Todays super efficient windows (Low-E + Argon) are R3 with the most heavily insulated ones being around R3.5 (or u-value of 0.28)

Windows are terrible at insulating or lowering ones heating bills... even todays best. I have a program that calculates savings based on previous to new. Want to know what each of my 3x3 windows is saving me now that I replaced them?

My old 35 year old windows were just double-pane (U-Value 0.5) and my new Low-E + Argon were U-value 0.32 (R3). Improving 9 square feet from R2 to R3 for my Heating Degree Days area (New England) is saving me $6.05/year in oil for each window but each cost me about $200. Payback = not my lifetime. I changed them because some were broken, my wife wanted something easier to clean, and I hated the mildew that formed on the bottoms of the frame under the glass. I still get the mildew even with these new vinyl windows but it's a simple clean come spring.

If you want to save $ look to sealing air leaks, penetrations, adding insulation, but don't replace the windows to save on heating replace them only because of something else.

Last edited by Piedmont; 10-28-2009 at 04:04 PM.
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Old 10-28-2009, 06:33 PM   #5
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Anderson Windows Code


I replaced my double pane reaplcement windows with Andersen 2x pane LowE new windows - most high performance glass
The majority of my improvement came from the fact that they left the old sash weights in & did not insulate the pockets
So on each side if every window I had an uninsulated ~3" gap
With 2x & triple windows I had 12" gaps = 7 all together
In addition I was able to get rid of old rotting sills that were also left in place
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