Hi Dena, A solar pool cover should give you an extra month of swimming at the beginning and end of each season. As was mentioned above, about an extra 10 degrees is normal. The biggest advantage comes when you use an additional hear source. Either a solar heater or conventional heater. The solar cover will hold the heat in over night.

The solar cover reel. A must have item in my book. So much easier. An above ground version can be mounted in the center of the pool or an inground version can be mounted on poles at one end of the pool.

Best of luck, Dennis