`Mechanical and plumbing design for two 5-unit townhome buildings, with a focus on energy efficiency and sustainability. Design included 20-SEER split system HVAC units with ultra-high-efficiency natural gas furnaces, tankless natural gas water heater and low-flow plumbing fixtures. Careful attention was paid to coordinate pipe and duct routing as the architectural design included open floor plans and openings between levels leaving few paths up and down. Modeling and coordinating these systems in Revit helped the project to be successful by reducing field-coordination of such critical design elements.