Founded in 1978, Scientific Environmental Design, Inc. (SED) is a leading provider of advanced scientific design, engineering and managed installation of heating and cooling systems for residential and commercial buildings. The company developed the patent-pending Total Flow design process that includes their proprietary ProDesign software to assist architects and builders in designing the cleanest, most comfortable, energy-efficient HVAC systems on the market. SED introduced the industry’s first and only performance guarantee for the lifetime of their HVAC systems.