Check that your solar-energy installer has the proper licenses and insurance. Installing solar panels on a steep roof is a delicate job, and you should feel confident that your installers know what they are doing. At a minimum, look for a contracting license, workers compensation insurance, and general liability insurance.
Hot Sun Industries, maker of the Powerstrip solar pool heating system explains basic system operation as well as some plumbing guidelines.
Be aware that you can still get solar power benefits even if you live in a chilly, overcast area. It doesn't need to be like Florida all year round for it to be a big part of your energy savings goals. Great solar power output can come on poor weather days.