Tom from SWISCO responded:
September 13, 2016
Thanks for posting, Alex! I'm afraid I can't say for sure how heavy the window sashes are. It depends on many factors, and judging by the age of your house I don't think we can reliably estimate the weight. There are just too many little details that could alter it, and balances are fairly precise systems. It's important you only get the option that matches your weight; no more, no less. I'm sorry we cannot offer you an easy answer, but the only way to know for sure is to weigh the sash.
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