This graph shows the temperatures that can be expected in a South Florida pool throughout the year with and without a solar pool heater. The bottom bell curve shows the average unheated pool temperatures throughout the year, while the top bell curve shows the temperatures that can be expected with a properly-sized solar pool heater. The middle line shows the temperatures that can be expected with an approximately 80%-sized system. This graph assumes the use of a pool cover when the temperature drops below 65°F.