Yeah the one large custom order window I bought for the living room was argon filled. I think it cost an additional 30 some dollars.
I use 120 cubic foot argon bottles. If I used 1 cubic foot per small window that would cost me less than $1 in argon.
The problem with using silicone is the silicone inside the window won't cure because there is no oxygen.
I guess I will just have to drill one, purge it, fill it, seal it and see what happens.
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