There are many ways to cover your swimming pool when not in use. The two most common ways to cover a pool in the Midwest and colder states is either by a solar cover or an auto cover. Auto cover fabrics are typically made of vinyl material where solar covers are made up of a plastic material such as polyethylene and polypropylene. Covering your pool is important to saving on energy costs as well as evaporation of your pool water. According to the United States Department of Energy covering your pool water surface can give you a savings of 50-70% on energy! A lot goes into determining which type of pool cover is best for you depending factors such as price, new pool vs. old pool, shape of pool, climate, and indoor vs. outdoor pool. When looking into investing in a pool cover you have to consider factors such as how climate will affect the temperature loss of your pool water. You also need to consider how often you will be using your pool to recoup the energy savings of your cover investment. In warm climates, such as out west or down south, solar covers and auto covers are not as common since the average temperatures and sun exposure is much greater than in the northern and Midwest states. When living in colder areas, such as the Midwestern states, that have a shorter pool season, it is important to cover your pool surface in one way or another to help reduce high monthly energy bills. With average nightly temperatures being much lower your pool will evaporate more frequently causing energy loss and increasing heater bills throughout the season.