FAFCO solar panels are rated the highest of any in the market by independent testing organizations. A properly designed system will allow Florida Solar to provide a written guarantee, ensuring that your pool water will be over 80°F for 10 months of the year. During the coldest weeks of the year (usually January) the air temperature is too cool for most people to enjoy swimming, so the average customer does not miss using their pool when the sun is too low in the sky to produce a really warm pool. The solar heated pool will typically be at least 12-15 degrees warmer than an unheated pool, even in the worst conditions.