Spiral Spring Selection

A home owner from New Jersey says:
Hello!
I am replacing my spiral springs (3/8"×31") and there are no colored tips on mine. The sash weight is 20 lbs. Should I get red tips or bump up to green? Will a heavier spring capacity improve performance?
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Emily from SWISCO responded:

Hi there!

Sure, the green tip option carries 20 pounds. That should be fine. It'd only be an issue if you go all the way up to yellow. 

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