InterNACHI Attic Ventilation and Interior Practice Test 2026 – Complete Exam Prep

Energy-recovery ventilation systems are designed to bring fresh air into a building while simultaneously minimizing energy loss. These systems work by transferring heat and moisture between the incoming and outgoing air streams. As the stale indoor air is expelled, the energy contained in that air—whether heat or humidity—is used to pre-condition the incoming fresh air. This process helps maintain indoor air quality without excessively using energy to heat or cool the incoming air, thereby reducing energy costs. By making the ventilation process more efficient, energy-recovery ventilation systems help homeowners achieve better overall energy performance while ensuring a healthy indoor environment.