The sun gives off an abundant amount of free heat every day.A solar cover, also referred to as a solar blanket, is one of the most cost effective ways to take advantage of the suns free heat. Typically there is a 15-degree temperature rise in your pool water when using a solar cover. A solar cover is a great way to capture that heat and take full advantage of this natural resource to heat your swimming pool. You can heat your swimming pool with absolutely no energy costs. A solar cover is a great way to heat your pool early in the season, capture and hold the heat during hot summer days, as well as extend your swimming season into the cooler days of autumn. You can open your pool earlier in the spring and close it later in the fall because your solar blanket will keep the water nice and warm.