Abstract: A centrifugal blower has a first housing section and a second housing section separated by a width of the centrifugal blower. The centrifugal blower also has an intake port extending through the first housing section and the second housing section along the width, and an outlet port formed by the first housing section and the second housing section. A dimension of the width continuously decreases as the outlet port is approached along a length of the centrifugal blower.

Abstract: A centrifugal blower has a first housing section and a second housing section separated by a width of the centrifugal blower. The centrifugal blower also has an intake port extending through the first housing section and the second housing section along the width, and an outlet port formed by the first housing section and the second housing section. A dimension of the width continuously decreases as the outlet port is approached along a length of the centrifugal blower.

Abstract: Disclosed herein are systems and methods for predicting an energy savings resulting from the replacement of existing equipment with new equipment. In the example embodiments, the energy saving prediction is utilized to create a customized warranty for an individual customer of an HVAC system or subcomponent thereof. Historical energy usage, historical climate data, old and new equipment parameters, and customer use data is input to a predictive modeling algorithm, which determines an energy savings prediction. Alternative models may be employed and a weighting factor applied to each to arrive at an improved energy savings prediction. The energy savings prediction is utilized to warranty to the customer an estimated dollar savings that will result from the installation of the new equipment. The warranty provides that, in the event the predicted energy savings is not realized, the customer is entitled to receive a dollar amount representing the shortfall in warranted energy savings.

Abstract: A ventilation system for a building in some cases includes a main HVAC blower for moving temperature-conditioned air through the building plus a smaller ventilation blower for providing fresh air. A controller regulates the ventilation blower's speed to provide a target ventilation flow rate regardless of changes in the pressure differential between the indoor and outdoor air. To ensure that the target rate is appropriate for a particular building, the target flow rate is determined based on a ventilation setting that reflects a specified number of bedrooms and a specified amount of floor space of the building.

Abstract: In an air conditioning system for circulating cooled air to an enclosed space, a controller including a temperature sensor, a humidity sensor and a microcontroller for controlling the indoor fan or blower to prevent operation of same if a fan run-on mode is selected or continuous fan operation is selected and the humidity sensed in the enclosed space is greater than a predetermined amount. Continuous fan operation is allowed unless the humidity exceeds a user defined setpoint during an air cooling operating mode. If the humidity sensed is greater than the predetermined amount, the fan is operated only when the system is providing cooled air, such as when the system compressor is energized.