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The primary function of insulation in a building is to reduce energy loss and maintain temperature. Insulation works by creating a barrier that slows down the transfer of heat between the inside of a building and the outside environment. In colder months, insulation helps keep the warmth generated by heating systems inside, while in warmer months, it helps to keep cool air within the building. This not only contributes to a more comfortable living or working environment but also results in significant energy savings, as it reduces the need for heating and cooling systems to work harder.

Other functions, such as providing soundproofing or acting as a pest barrier, may be secondary benefits or the result of additional materials used, but the primary role of insulation hinges on its ability to minimize energy loss and maintain a stable temperature within the building.