High performing buildings consume considerably less energy and water than conventional buildings. Through energy modeling and water use projections, design teams have been able to calculate the amount expected to be saved during the design phase. However, not much has been done to circle back and compare these projections to actual performance. This pilot study compares actual operating results to predicted in 21 public buildings in Massachusetts to learn how accurate these projections are.

This session details the design and construction challenges inherent in a net zero energy remodel and addition to a modest single family residence in Arlington, Massachusetts, completed in winter 2021. The project team sought practical, low cost, and reproducible solutions to meet project goals of net zero energy, minimizing embodied carbon, and electrification. We aspire to broaden the toolset of owners, designers, and builders by sharing our approaches to permit approval, structural design, building envelope, window specification and installation, and HVAC.