Hello I live a little north east of Dallas by about 40 miles. I have a pool only with a surface area of about 650 ft sq. It is about 13,000 gallons. I would like to extend my swim season on both ends. I am considering a gas fired heater or a solar system. I think most of this extension will be weekend use. I found on website that said 8-9 months out of the pool with 11 4x12 panels for about $4k. That sound like a lot of area. not sure if i can house all that on the roof. Anyone using solar in dfw? how are the results from a temp and season extension?