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HeyBub[_3_]

wrote:

I live where electricity is very expensive, and a $600 bill would be
unusual in a house less than 5000 square feet.

For that matter, geo-thermal heating and cooling generally has a much
faster ROI than photovoltaic.

If all you are looking at is cost, you do the cheapest stuff first.
It's often the most effective, anyway.

Solar panels can be obtained very cheaply in some areas.

http://www.mydesert.com/apps/pbcs.dl...12/1026/news12