What is the primary purpose of insulation in wall assemblies?

The primary purpose of insulation in wall assemblies is to regulate temperature and reduce energy costs. Insulation materials are designed to resist heat transfer, helping to maintain comfortable interior temperatures by keeping warm air in during winter and blocking heat from entering in summer. This thermal resistance, or R-value, of insulation plays a crucial role in energy efficiency within buildings.

By minimizing heat loss or gain, insulation directly impacts energy consumption related to heating and cooling, thus leading to reduced energy costs for homeowners and occupants. In colder climates, good insulation can significantly lower heating needs, while in hotter areas, it keeps indoor spaces cooler, reducing reliance on air conditioning. Beyond energy efficiency, though other choices may suggest different functions, they are secondary to this primary benefit concerning insulation’s role in walls.