Identifying Spiral Balance for Tilting Windows

A quick learner says:
Question about using red tips or green tips.
The tube measures 28 1/2" long, 3/8" diameter, the windows is a little over 20 pounds.
The existing tip is red. I'm pretty sure that I need the S900-29.
The house and its windows are a little over 12 years old. The windows have not been opened regularly over the years.
All of the red tips on the spiral balances are cracked making the windows hard to open and stay open.
When ordering balance replacements should I order green tips instead of red?
Is it normal for the tips to break after 10 years or is it because
green tips should have been originally used?
I think the windows are in the upper weight range of the red tips and more towards the middle of the range for the green tips.
I don't want to have to change the balances in another 10 years but I also don't want to select the wrong tips.
Thank you very much for your help!
A user submited photo of tilt window spiral balance
Profile picture of Donna
Donna from SWISCO responded:
Thanks for posting! Balances are under the most pressure when the window sash is closed. So even when your windows are not being used, the balance is still under pressure.

The Red tip on S900-29 has a weight range of 10 through and including 22 pounds. The Green tip on S900-29 has a Weight Range of 14 through and including 26 pounds.

This information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate
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