Most simply put, an HRV removes stuffy air from your home, and replaces it with fresh outdoor air. The system has two ducts- one to carry in the fresh air, and one to remove the stale. Each side of the ducting passes through a heat exchanger-which allows heat to transfer from one airstream to the other, both bringing in fresh air, as well as reducing heat costs. This will help your home maintain ideal humidity levels indoors, as well as reduce allergens in the home. An HRV is an ideal HVAC addition to any home that just isnt generating the fresh air you need!