Andersen window balance

A home owner from Howell, MI says:
August 14, 2014
I've decided to replace the broken window balance on some of our Andersen windows thanks to your instructional video. So thanks for that...I think. So quick question, is there any way to tell which balance is required without taking the window apart first? The windows, I believe, were installed when this house was built in 1984. I've attached some pictures but don't know if they'll be of any help. Thanks in-advance for any guidance you can give me. And thanks again for the instructional video.

Tom B.
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Paul from SWISCO responded:
August 15, 2014
If you give me the width and height of the visible glass for both the bottom and top sash (separately), I can make an educated guess. It won't be as reliable as knowing what's printed on your balance, though.
A quick learner from Howell, MI says:
August 17, 2014
I decided to quit being lazy and take a look at the balance. I've attached pictures of the balance. The windows have a wood frame and the glass, upper and lower, is 32" wide x 24" high. Thanks for your quick response and help Paul.
User submitted photos of an Anderson balance.
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Tom from SWISCO responded:
August 18, 2014
Perfect! I recommend our 24-939. This can replace Andersen balance boxes stamped with 9#27.
A quick learner from Howell, MI says:
August 24, 2014
Thanks for the recommendation. I ordered and installed the parts on two windows and they work perfectly.

I'd appreciate another recommendation for windows that are 40" wide x 24" high. The balance is labeled 12#31. Thanks Tom.
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Tom from SWISCO responded:
August 25, 2014
Awesome! Glad it worked. For this other window, I recommend our 24-1231. This is for balances stamped with, of course, 12#31.
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