What is insulation primarily used for?

Insulation is primarily utilized to reduce the transfer of thermal energy between spaces. Its main purpose is to create a barrier that minimizes heat loss during colder months and heat gain during warmer months, thereby enhancing the energy efficiency of a building. Effective insulation helps maintain a stable indoor temperature, leading to reduced heating and cooling costs and increased comfort for occupants.

The other options focus on aspects that do not directly align with the primary function of insulation. While aesthetic appeal is important in building design, it is not the main role of insulation. Similarly, insulation does not provide structural support; its function is not related to the integrity or stability of the building structure. Lastly, while insulation can contribute to energy efficiency and, indirectly affect air quality by maintaining better climate control, it is not explicitly designed to improve indoor air quality. Its primary role remains firmly in the realm of thermal energy management.