NCIDQ Interior Design Professional Exam (IDPX) Practice Exam 2026 - Free Interior Design Practice Questions and Study Guide

The main purpose of insulation used in interior walls is to prevent heat transmission from one side to the other. Insulation materials, such as fiberglass, foam, or cellulose, are specifically designed to reduce thermal bridging and minimize heat loss or gain. By maintaining a more consistent temperature within a space, insulation contributes to energy efficiency and comfort levels.

In addition to thermal performance, insulation can also enhance acoustic properties, which might explain why the answer given focuses on improving acoustic characteristics. While insulation does help improve sound attenuation between rooms, the primary function of insulation is indeed to manage heat transfer. This is crucial in energy-efficient building design, which prioritizes maintaining comfortable indoor climates while reducing reliance on heating and cooling systems. Thus, the correct response highlights the insulation's role in preventing heat transmission, underscoring its importance in both energy conservation and occupant comfort.