How does proper ventilation complement insulation?

Proper ventilation complements insulation primarily by preventing moisture buildup. Insulation is designed to keep conditioned air in and unconditioned air out, which is essential for energy efficiency. However, if ventilation is not adequately managed, moisture can accumulate in spaces such as attics or wall cavities, potentially leading to mold growth, wood rot, and other issues that compromise the integrity of the building structure and the effectiveness of the insulation.

Ventilation works by allowing fresh air to enter and circulate through a building while enabling water vapor and stale air to exit. This exchange is crucial in maintaining balanced humidity levels, thus protecting both the insulation material and the overall building environment. By controlling moisture, proper ventilation helps extend the life of the insulation and improves indoor air quality, making it an essential aspect of a well-functioning thermal envelope.

While the other options discuss important aspects of building performance, they don't capture the核心 function of ventilation in relation to insulation as accurately as the control of moisture does.