Yes, balanced ventilation systems can be integrated with existing HVAC systems. In fact, many modern HVAC systems are designed to work in conjunction with ventilation systems. The key is to ensure that the ventilation system is properly sized and configured to work in harmony with the HVAC system. This may involve modifying the HVAC system’s controls, ductwork, or equipment to accommodate the ventilation system’s requirements. A qualified HVAC professional should be consulted to ensure a successful integration.