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This case study details a deep energy retrofit of the Carol Avenue Apartments in Boston, a 33-unit affordable housing property built in 1910. The project, scheduled for completion in late 2024, focuses on eliminating on-site fossil fuel combustion through electrification, improving the building envelope from the interior to preserve a historic brick façade, and installing rooftop solar PV systems.

This case study details the planned zero-carbon deep energy retrofit of Hano Homes, a 20-apartment affordable housing property in Boston, MA. The project aims to achieve Phius certification by implementing a superinsulated exterior shell, transitioning to all-electric mechanical systems, and installing a rooftop solar array to reach net-zero energy operations.