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Take a look at Energiesprong which has in interesting approach to retrofit and is now working in a few countries, including USAmerica:
https://energiesprong.org

Solar IS Civil Defense
by gmoke on Fri Apr 1st, 2022 at 09:46:32 PM EST
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Video link ugh.

https://en.wikipedia.org/wiki/Energiesprong

Looks good!

by asdf on Fri Apr 1st, 2022 at 11:02:13 PM EST
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Also https://www.youtube.com/watch?v=Lcede_lcgo8
by asdf on Fri Apr 1st, 2022 at 11:07:42 PM EST
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