Abstract: An HVAC system includes a desiccant wheel, wherein the wheel's speed varies with airflow, the wheel is energized for at least a set period at startup, and/or a heat recovery system (e.g., an air-to-air heat exchanger) upstream of the wheel enhances the system's ability to dehumidify air.

Abstract: A heat recovery arrangement. The arrangement comprises a housing including a bathroom exhaust inlet, an exhaust outlet, a bathroom exhaust airflow path through the housing from the bathroom exhaust inlet to the exhaust outlet, a return air inlet, a return air path through the housing from the return air inlet to the exhaust outlet, an outside air inlet, a supply air outlet, an outside air path through the housing from the outside air inlet to the supply air outlet; and a heat recovery device extracting heat from the exhaust airflow path and the return airflow path and transferring heat to the outside airflow path.