Solar Passive Window Heater v2 - Cheap And Effective!

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I've been promising to make another one of these for a while and now that it is cold in Texas I did just that. This build is much cheaper than last year ($150 vs $20) but much smaller and more portable.

I left the top open as I haven't decided how to plumb it into my house yet and that part is not as critical because your house will be much different than mine and you can probably think of a better way to do it than me.
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