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Danged if I know what gas they put in these days...but I replaced our windows with double-paned, whatever-gas filled (rated for most of canada, even though we live in a warmer zone) and it cut our heating and cooling costs in half over the single-paned ones the place came with.
Our heat and/or AC used to stay ON the whole time when it was cold or hot, and now it just cycles on for half or less of the time. More than noticeable difference.
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