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<p>I can barely believe what I'm reading but, if bubble wrap even
comes close to an answer, you might also look at using 3M heat
shrink window insulation film, which you can actually see through,
and know what's happening on the other side. It is actually made
for the job you describe and is only about $20. I got mine from
some outfit in Canada. The small door pack is probably more than
you need. My brother got worthwhile results by simply taping it
to the aluminium frames, but I made up a timber frame out of 15x40
with foam surround which slides snugly into the timber reveal, and
also makes it portable. The thermostat activity is a good
indication of its effectiveness. We need the window openable most
of the year, so I made an envelope from foil insulation to store
it in.</p>
<p>If you live in a seriously foul climate, I imagine it would be
quite practical to put the film on both sides of the frame and
suffer no evident loss of transparency. It does not appear to
attract dust, and can survive a cockatoo flying into it without
damage. <br>
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<p>I submit it a pretty good long-term proposition as cheapskate
double glazing, particularly if you are not opening the windows.<br>
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<p>Nick Pyner</p>
<p>Dee Why NSW<br>
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<br>
<div class="moz-cite-prefix">On 1/07/2017 2:42 AM, Clarke Olsen
wrote:<br>
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Bubble wrap?<br>
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Sacie Lambertson <<a href="mailto:sacie.lambertson@gmail.com">sacie.lambertson@gmail.com</a>>
wrote:<br class="Apple-interchange-newline">
I want good light but at the same time also want to add another
layer on the interior side of the windows that might make the
openings more energy efficient. <br>
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