The full name of an HRV is a Heat Recovery Ventilator. An HRV has the ability to provide continuous fresh air delivered to the living areas of the home and continuous exhaust from the bathrooms. Most of the heat from the exhausted air is recovered in the equipment and distributed out the fresh air side of the system. Installers of HRV’s should be Red Seal Certified Sheet Metal Technicians. A good installer will ensure the duct system is properly sized and completely sealed because duct sizing and leakage in HRV systems extremely reduce’s the efficiency of the system. An HRV system must also be tested and balanced at start up. Balancing ensures the systems fresh air coming into the home is equal to the exhaust air coming out.