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flag Boston installs window heat pumps in public housing to cut emissions and save money, starting with 100 units for seniors.

flag Boston is installing window-mounted heat pumps in public housing units to cut emissions and lower energy costs, starting with a 100-unit building for elderly residents. flag The small, U-shaped units, made by startup Gradient, fit standard windows, require no major renovations, and can be installed in under an hour using a regular outlet. flag Unlike older heaters or air conditioners, they provide both heating and cooling, improving comfort during extreme temperatures. flag Funded by a state energy efficiency program, the project supports Mayor Michelle Wu’s 2030 decarbonization goal and is part of a growing trend in cities like New York. flag A 2025 study found the pumps save nearly $35,000 per unit over time, and with 60% of U.S. housing units compatible, the technology offers a fast, scalable solution for decarbonizing multifamily buildings.

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