They were having issues with keeping two bedrooms on south end of house warm. Found that the supply in the bathroom between the bedrooms was satisfying the thermostat before the bedrooms can get warm. Closed the balancing damper for the bathroom to force more air to the bedrooms. Also closed the balance dampers for basement supplies to force more air to the first floor. Thank you for choosing Black-Haak. Please take a moment to fill out our online survey.