What is the main function of insulation in a building?

The main function of insulation in a building is to control airflow and temperature. Insulation helps to create a thermal barrier that reduces the transfer of heat between the interior of the building and the outside environment. This thermal resistance is essential for maintaining a consistent indoor temperature, which can enhance comfort for the occupants and improve energy efficiency by reducing the load on heating and cooling systems.

By minimizing heat loss during the winter and keeping heat out during the summer, insulation plays a critical role in energy conservation. It also helps to reduce heating and cooling costs, making buildings more economical to operate. Additionally, insulation can contribute to soundproofing, providing another level of comfort for the occupants by limiting outside noise intrusion.

While other options mention structural integrity, aesthetic appearance, and foundation costs, these do not primarily relate to the core responsibility of insulation, which is focused on thermal performance and energy efficiency within a building.