Converting non-tilt to tilt jambs-larger alum/glass commercial bldg

A contractor from Minneapolis MN says:
We need to replace the channel balances on 9 alum double hung windows, operable tops and bottoms. Windows require 37" or 41", series 60 spring loaded balances. Windows are appx 30 lbs each top or bottom. Is there a jamb liner kit we can purchase to convert either both upper an lower, or only lower to tilt out as long as we have to remove each window?

The balances were marked: 41"-4050-0880-67-40-P and 37"-363-0880-67.
Do you offer a better quality balance so we don't have to do this in a couple years?
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Paul from SWISCO responded:
Unfortunately, I believe you will need to stay with the channel type window balance, since you have aluminum double hung windows. You can't make this kind of window a tilt-in or incorporate a jamb liner.
A quick learner from Minneapolis MN says:
Do you have a better quality balance that will not require replacement every few years? The windows are in a central business district of a downtown and are subjected to a fair amount of dust, grime and pollution. thx
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Tom from SWISCO responded:
Manufacturers don't really make "better quality" balances as opposed to "low quality" balances. You really just have to work with what they design for your window. That said, the average life expectancy of a window balance is approximately 10-15 years, depending on use.
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