It depends on the type of system, smaller heaters like an El Nino or Ez heat you may see only 10 degrees, with a Bigger name brand pool heater like a Fafco or Vortex system you will see up to 20 Degrees above ambient air temperature. So in places like Florida you can use them to basically swim all year round.
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Solar covers can typically raise water temperature by 10 to 15 degrees depending on length of time its on and if your back yard has shade. Also understand that while you have your cover on you should never run your filter... so your water is getting warmer but your pool water is stagnant and not circulating. warm water is also a breading ground for algae. a lot of times i see people throwing there solar covers on end of season in hopes that they will get more swim time when in fact all they are doing is preparing for a green pool when it comes time to open it the next season.
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A standard bubble pool cover and increase your pool water temperature by up to 10 degrees Fahrenheit.
If you keep your solar blanket clean temperature can go as high as 20 degrees ore then without