is it possile to upgrade old upvc units with modern glass?

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we have some perfectly usable upvc units with double glazing that has what looks like double the old single row of holes type beading between the panes, sorry for not knowing the actual thickness.

anyway is it possible and presumably cheaper to just replace the glass with something like argon filled? to stop the morning condensation. in one room we have a modern window with an old one and the difference is startling ones soaked ones dry.
 
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what would be the best most energy efficient units I could put in at the most cost effective price point? don't want to spend a fortune trying to get that last little bit of heat retention if it wont make that much difference.
 
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the basic make up off modern double glazing would be clear Glass / aluminuim spacer bar + argon gas / Low Emissity Glasss ( heat retention ...usually Planitherm these days rather than Pilkington K ),
next option up same as above but replace the aluminium spacer bar with a ' warm edge spacer bar ' ( the bar is made of plastic so doesn't allow heat transference ) ...
the next up same as above but replace the clear glass with a ' Low iron glass ' ( removes the green tint so allows more sunlight through...called a g value in the industry ) .

Which one is best for you would depend on how much you are prepared to pay to be honest, and it will only be cost effective if you are doing all of them ( except obviously the modern window )
 
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The other thing I'd say is the night time condensation has to go somewhere, the temperature of the coldest surface determines how much condensation there is, and that surface pretty much takes it all. So if you did improve that one, then the other window would then be the coldest, and it would get the condensation, only a smaller amount.
This is a common problem when people get extra insulation, the unimproved parts of the house then get the condensation.
Having said that if you have good enough ventilation, that should dissipate a certain amount of the moisture, and the warmer window might just about get away with it.
Worth thinking about anyway! Good luck, John
 

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