Our pool water is very comfortable in the summer months as is. During mid December through mid February the solar is not enough, so we cover the pool when not being used and run a heat pump. The heat pump is much slower to heat the pool than gas, but also costs way less to run. When we got to our home this winter, it took a day and a half running the heat pump to get the pool up to 90 degrees, but once there, the combination of covering the pool and periodically running the heat pump allowed us to swim all winter. Once March rolled around, on most sunny days the solar got our pool up to a too hot 94 degrees so I had to turn down the solar setting. So in summary, you need either a heat pump and a cover or a gas heater during the coldest couple of months (when the days are short and the sun is low). From early March through May and again from October through early December the solar is all you really need. Between June and September the water will be just fine with no heat source besides Mother Nature.
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