Koronin, solar panels are all well and good, but you'll get alot more bang for your buck if you spend your money on really good insulation. Get a blower door test and find a really good insulating contractor who will look at everything and install it properly.

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I filled up my little car today for $47. Since I usually fill up once a month or so, it's not a hardship for me, but if I had to do it every few days, I would have a problem.