Stewards of Affordable Housing for the Future's (SAHF)'s case study explores challenges and achievements from The Community Builders' North Commons at Village Hill development in western Massachusetts, built to the Passive House standard. The case study shares the developer's perspective on assembling a team, electrifying hot water heating, and installing Phius-compliant windows. Ultimately, the benefits outweighed the costs for this development.

NEEP's Cold Climate Air Source Heat Pump (ccASHP) Product List is a useful starting point for those seeking information on different models of cold climate heat pumps. The list includes ASHP systems that meet the latest version of the ccASHP Specification. The voluntary specification includes requirements for both performance levels and a series of reported performance standards.

This report examines how budget-constrained households balance spending on air conditioning versus other essentials like food and clothing during hot weather. Using banking data from Houston, Los Angeles, and Chicago, it finds that low-income households often cope with high electricity bills by reducing air conditioning use and enduring more heat. The findings aim to help policymakers identify strategies to better support these households and improve their welfare amid rising temperatures.

Electrifying heating systems with air-to-air heat pumps is crucial for achieving global greenhouse gas targets. This report uses simulations of 550,000 U.S. households to evaluate the costs and benefits of various heat pump performance levels and insulation upgrades. The analysis highlights the potential for significant emissions reductions and identifies the importance of efficiency and insulation in optimizing cost-effectiveness. It also suggests that supportive incentives and policies may be necessary to address affordability challenges and promote widespread adoption.

Advanced Energy Design Guide for Multifamily Buildings-Achieving Zero Energy (AEDG) is the third in the AEDG zero energy guide series. The design guide outlines strategies for achieving energy targets such as setting measurable goals, hiring design teams committed to those goals, using simulation throughout the design and construction processes and being aware of how process decisions affect energy usage. In this edition, content has been included on renovation and resiliency along with expanded guidance on hot water and high load in multifamily buildings.

Large multifamily buildings with central heating systems that burn fossil fuels are among the hardest to decarbonize, but new systems such as window-mounted heat pumps, central air-to-water heat pumps, and “mono-block” mini heat pumps provide new options for decarbonizing these buildings. This report finds that window heat pumps generally have the lowest life-cycle capital and energy costs compared to various decarbonization options. 

The Massachusetts Decarbonization Hub helps owners of affordable multifamily housing interested in reducing carbon emissions from their Massachusetts properties navigate the complicated landscape of decarbonization. Created in partnership with LISC Boston and RMI, this site provides quick access to guides, resources, and funding opportunities currently available to support these projects. The Hub outlines some key steps to decarbonization, connects owners with technical providers, directs owners to the available incentive and grant funding programs, and showcases case studies of recent deep energy retrofit projects for inspiration.

The Hub is a technical resource designed to help equip the multifamily affordable housing community in Colorado with electrification design and decisions through access to technical resources, peer learning, and financing and development resources. This resource supports Colorado’s Renewable Energy and Climate Action Goals. In addition to local code compliance, building electrification can help reduce carbon emissions, improve indoor air quality for residents, reduce operating costs, and more.

Salem Heights Apartments, an affordable multifamily property in Massachusetts, recently underwent a deep energy retrofit to achieve passive house performance. This case study highlights the retrofit design strategies that enable 60% energy use reduction and show the integrated benefit of efficiency improvements, electrification, and solar. Specific strategies are described for the building envelope, exterior insulation, HVAC, and solar energy.

Over half of California’s 3.2 million multifamily units were constructed before energy efficiency standards, resulting in poor performance and high greenhouse gas emissions. To achieve California’s greenhouse gas reduction goals, affordable multifamily housing must improve energy efficiency, reduce carbon emissions, and lower tenant utility bills while enhancing quality of life. Yet building owners face many challenges to improving the performance of their buildings. This report covers the role certain types of energy service agreements, combined with federal incentives, can play in scaling affordable multifamily retrofits.