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Combining energy-code compliance with marketing, insulation manufacturers have begun to offer energy cost guarantees to homeowners through new home builders. The first such program, called Engineered For Life, is a joint venture of cellulose manufacturer Greenstone Industries, installation trainer Advanced Energy Corporation, and Building Science Corporation, an energy-efficient design company. For homes built by participating builders, Greenstone provides the homeowner with a maximum heating and cooling energy-use guarantee for the life of the home. If energy consumption exceeds the guaranteed amount, the insulation manufacturer will pay the difference. Since Greenstone became the first manufacturer to offer such a guarantee, others have begun to set up similar programs. Builders can participate in the Engineered For Life program at various levels, beginning with a "Silver" guarantee based