Solar is definitely more effective in the South and in the Summer, but that is not quite the point. Solar still generates plenty of power when installed in NH, and that power will get you an excellent financial return at very low risk. Basically, you sell your excess solar power to the grid in the Summer, and buy traditional power to supplement your needs in the Winter, with all the math and money handled by your electricity supplier.
At least in Mass in was easy to get quotes from excellent experienced installers after a simple Google search. NHEC would probably be very helpful too.
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