[quote=Navydoc]That’s making me want to buy a solar heating system for the pool. My pool builder said they were a waste of money, but your numbers would suggest otehrwise. Our pool was nice yesterday, but was only 77. Out of curiosity, is your pool dark? Mine is light and it seems the dark pools are warmer. Not sorry I went with the light bottom, I love the way the pool looks.[/quote]You pool builder is correct. I would much rather use the extra roof space for more panels for your electricity usage than to heating the pool. I find pool pump to use a lot more energy than nat gas to heat the pool. Especially if you just get a solar blanket the keep the heat in the pool. It raises the pool temp by about 5 degrees.