Rivco windows

A quick learner from Atkinson nh says:
My Rivco Windows are about 16 years old they are tilt out windows and very hard to push up and down.
Is there an adjustment I can do.

Thank you for any help you can give me.
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Tom from SWISCO responded:
It sounds like an issue with the window balance, which is a mechanism located on either side of the window. If you were to show me a picture of your existing balances, we can work from there.
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