We have 4 Twelve foot panels on the south side and 2 ten foot panels on the east. Even with that, we do not expect to swim year round, but enjoy having the pool at around 88 to 90 degrees for 9 plus months a year. When the day time temp is 60 degrees or less, we only use the hot tub. I would not use the pool when the air temps are at or below 60 degrees even if I could have 90 degree water temp in the pool. The variation is too great for me. Jack's was our choice after a detailed complex research for solar. They were not the cheapest, but they were top of the line quality with the material they use and their workers were polite and professional.
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