Replace both spiral balances?

A landlord from ohio says:
the upper sash came crashing down when I opened the locks. the lower sash works ok. I assume the balance spring is broke. should I replace both springs, or just the broken one?
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Tom from SWISCO responded:
It sounds like the balance, alright. We recommend replacing both balances at the same time. Otherwise, you'll have the newer balance working double time to make up for the older, weaker balance. You can always keep the functional older balance aside as an emergency backup.
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