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Chicago Green Insulation is a leading installer of spray foam insulation in the Chicagoland area. We are a licensed provider of premium open & closed cell foams and a premier user of PolyMac spray foam equipment. Spray foam insulation works as a combination of air, moisture, pollutant barrier that will keep your space comfortable 24/7 with a minimum cost from the utility companies. This high-performance thermal envelope increases comfort and reduces energy costs by eliminating air leakage between your structure and the outside elements.