Jack's Solar installed my pool solar system. He wrote right on my invoice he would guarntee 80 degrees Feb 20th thru October. If not he would come back and put in more panels. Last year we used the solar cover and the system beginning Feb 1 and the water was 80 plus degrees.
The use of the cover does a good job of not losing heat over night. I don't think any system without a cover can maintain warm water when the overnight temps get into the 50's or 40's.
Jack's Solar has an excellant reputation here in The Villages. I suggest if you are not satisfied to give Jack a chance to fix any problems you may have.
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