solar guys have a good rep never heard anything negative.
But as a DIY project it is easy, provided you're not bothered by jumping up on the roof. HD sells them for under $200 I think.
I rate it on scale of 1-10 as a DIY a 6.
I was in a home with them and recall one issue, they lite up the area when you don't want it also?
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Nova Water filters
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