Can you make a dual pane window out of a single?

Just thinking about it,couldnt find any old posts or websites. But Say you cut a pane of glass made a 1/2inch plastic spacer glue it onto top of a single pane window.
Hard question but, would be About how much would this help the Efficiency?
Would it turn a r1 window into say r2? Or would it be so little it wouldnt Even pay for the pane over the long run :)
Just a idea :) Thanks for the help
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chad wrote:

It would help. How well it would work would depend on the job you did.
Real such windows have very dry clean air between the windows with seals designed not to leak for many years. From that start they add additional improvements. You are not likely to be able to come close to the basic window on your own.
Considering you can buy dual pane glass made to size for not all that much money, trying to do it yourself is not generally a good idea.
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It would help significantly in terms of condensation, and coldness. It may well have condensation on the inside of the pane.
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chad wrote:

For the effort, you're better off installing storm windows. For seasonal use, you'd probably achieve about the same efficiency as those blow-dry-to-fit window insulation kits.
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chad wrote:

if you are looking for something to keep the heat from the sun hitting the glass/window and then heating up the house??? try Solar screens.. i got the stuff at home depot and used it and its great.. with it you can go inside and put your hand on the window and not feel the heat of the sun hitting the glass.. this makes the room a little cooler... it probably helps...
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I asked an istaller about doing that he indicated that they would become dirty and full of condensation. requiring yearly cleaning.
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On 16 May 2004 02:07:47 -0700, snipped-for-privacy@yahoo.com (chad) wrote:

Probably not much. A half inch is a significant space in terms of convection currents being able to transfer heat from one side to the other. You also can't use an inert gas to fill the space, so you're left with good old air.

Wouldn't pay, and will tick you off when the moisture trapped between panes condenses.
Buy a double glazed pane or sash, or even replace the window. Storm windows, proper weather stripping and so on would be far more productive in terms of expenditure.
Jeff
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Thank you everyone for your help :)
Think im oging to give it a shot on some of my smaller kind of useless windows. down in the basement. Then buy some good new windows for other places. Then maybe the solarscreens type films. on the other single panes :)
Thanks again
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