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The first is obvious. A good design and insulated roof greatly improves the energy efficiency of a spa esterior. The cover slows down the rate of water evaporation, which removes heat from the water left in the spa. Also, evaporation control will result in maintaining proper water chemistry, which will reduce the use of necessary chemicals. These facts help control spa operating costs. It is probably understood by everyone that ultraviolet radiation from the sun is harmful to all plastic materials. Acrylics have very good resistance to sunlight, which is why they are commonly used for windows, skylights, airplane awnings,…