DMS heat pump systems use outdoor units similar to ductless heat pump (DHP) systems, with a small indoor fan coil unit and ductwork typically installed in suspended ceiling “chase” areas in the conditioned space to deliver heating and cooling to different rooms (e.g., bedrooms on the same hall). Heating or cooling rooms through one zone in a short-run ducted system is less expensive than individual DHPs for each room because two or more zones use the same fan coil unit. DMS concealed units are not as efficient as DHPs due to fan energy required to overcome the additional static pressure of the ducts that are connected to the DMS. Ducts must be properly sized and installed to overcome the system’s inherent lower external static pressure (ESP).
Current Stage: Approved for Implementation. See BPA Energy Efficiency Implementation Manual for measure and program details.