What is the primary function of wall insulation in a building?

The primary function of wall insulation in a building is to reduce heat loss and maintain internal wall temperatures. Insulation works by creating a barrier that slows the transfer of heat between the inside and outside of the building. During colder months, effective insulation helps to retain warmth inside, thereby increasing comfort and reducing energy costs associated with heating. During warmer months, it can also help keep cooler air inside, minimizing the need for air conditioning. By maintaining consistent internal temperatures, insulation contributes significantly to the overall energy efficiency and climate control within a building.

While soundproofing, pest barriers, and aesthetic improvements can be secondary benefits of wall insulation or associated products, they do not capture the primary goal of insulation, which is primarily thermal resistance and energy conservation.