No I haven't given it a whole lot of thought. I have heard of a couple of different ways from building a PVC Pipe system on the roof and painting it black to absorb more heat from the sun to commercial systems that cost big bux. I guess I'm just too warm blooded to swim all year round.

Oh and BTW, we do not have Sun 400 days a year, the Sun never sets here so we only have One Really long day. Go lay by your dish Carl LOL.