If your swimming pool is 80 °F and one pound of water evaporates out, there will be 1,048 British Thermal Units (measure of heat) lost. If I put 2 solar cover on top of other will the pool still heat efficiently? Will I lose some of my heat ? Hi quick question. Does not matter if the pump is running, although that will help to distribute the heat. This heat is then transferred to the water below it. Our pool is about 60,000 litres, no solar or other heating. They are the most common method for heating swimming pools, but do solar pool covers work? I heard that leaving a solar cover on my above ground during sunlight for several days and nights could cause algae blooms. Javier, I’m not sure about that, having never tried it. Do solar pool covers cause algae? When water evaporates it requires a lot of energy. There is no great and easy way to do this. Keep the cover on the pool to warm it during day and retain heat at night. It can certainly reduce heat loss, both through reduction of evaporation and reduced convection, but I don’t see how it can “increase” it. If they didn’t work at all, they would’ve died out a long time ago. Do you think the pool covers work better if the pump is off and not circulating. How does a solar cover work? I notice some covers are black on the bubble side. Thats right, evaporation and heat are linked. This budget solar pool cover includes draining holes to keep water from accumulating on top of the cover and claims to reduce evaporation by 95-percent. If you have one, it will trap the heat and prevent it from escaping your pool; keeping your pool water at a warm temperature. They use nothing but the sun to heat and prevent a great deal of evaporation and heat loss. And as far as “focusing the rays” is concerned; you’re talking about a little bubble of air with very little plastic surrounding it; the amount of focusing is going to be limited (plus, your filter circulating the water should have the same effect of ensuring the pool is an even temperature). A question again: So, how should I use my solar cover? Your email address will not be published. I have a 20' x 40' inground pool, 10 feet deep at the deepest point. The answer is yes! I have no affiliation with any company manufacturing or selling these products. Not only does it contain the heat, but it also helps it heat faster. Just the solar cover alone, bubble side down. I understand putting the solar cover at night when temperatures are going down into the 50s, but would I be better to take the cover off during the warm day time? Every time you lose water, through splashing or evaporation, you have to replace it. 2. A 2014 research by collage found that pool covers can cut energy costs by as much as 30%. Solar Covers Prevent Water Evaporation Research shows that pool covers can increase water temperature by 4 degrees. Do solar pool covers really work? I have a solar cover and it works great to warm up the pool using only the heat of the sun. We have the perfect selection of solar pool covers for your needs . Using a plastic cover alone can extend your swim season a couple of months on each end of the summer. Mr Merino, Thanks for the great information on this blog! We’ve measured a very real gain in temperaturein some cases as much as 4 degrees. And in 2012, A Michigan Energy Office case study on Chesaning Union Middle School pool showed a 50% reduction in energy use, with the unexpected benefit of reducing humidity inside the indoor pool structure. Thats pretty much how it went. 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