This study provides an overview of practices for quantifying and reporting avoided energy-water costs from demand-side measures. It also summarizes the regulatory guidance for incorporating water savings into cost-effectiveness screening for energy efficiency programs.

This 90-minute webinar explored the topic of linking and leveraging energy efficiency and renewable energy (EE/RE) programs for limited-income households, including the need to coordinate with other energy assistance programs. It presented case studies of organizations that have successfully advanced connections among available programs and funding sources.

State and local governments across the U.S. are focused on how clean energy can help them meet a variety of energy, economic development, and environmental goals. An early step for most energy efficiency planning involves identifying and quantifying energy savings opportunities, followed by understanding how to access this efficiency potential.  This website includes national and state-level energy efficiency potential studies for the residential, commercial, and industrial sector.  It introduces presentations on how building energy codes, city-led efforts, energy savings performance contracting (ESPC), industrial, and ratepayer-funded efforts can support state energy planning. 

This paper gives municipal leaders tools to assess local energy resilience, a new term for the interconnection of community resilience and various aspects of energy supply and consumption. It looks at different aspects of this concept, like thermal building performance and transportation connectivity, and methods communities can use to assess them.

The adoption of intelligent efficiency applications is increasing across multiple sectors of the economy. This report analyzes over two dozen of these applications in the buildings, manufacturing, transportation, and government sectors. We describe the technologies involved, characterize their use, and quantify their deployment. We also look at several enabling and cross-cutting technologies and the use of intelligent efficiency in utility-sector energy efficiency programs.

This summary from a Better Buildings Residential Network peer exchange call focused on key challenges and opportunities to deploy neighborhood energy programs. Speakers include the City of Orlando, SEEDS, and Research Into Action, Inc.

This guide is designed to help environmental agencies better understand the array of Lean methods and when to consider using each method. The guide focuses primarily on Lean production, which is an organizational improvement philosophy and set of methods that originated in manufacturing but has been expanded to government and service sectors.

This summary from a Better Buildings Residential Network peer exchange call focused on unique challenges for energy efficiency and weatherization programs serving lower income residents in single-family and multifamily housing. Speakers include American Council for an Energy-Efficient Economy, Elevate Energy, and Energy Outreach Colorado.

This summary from a Better Buildings Residential Network peer exchange call focused on behavior change program design and design thinking to increase program reach. It features speakers from See Change Institute, Efficiency Vermont, and Navitas Partners, Inc.

This report updates ACEEE's 2013 assessment of multifamily energy efficiency programs in US metropolitan areas with the most multifamily households. Using housing, policy, and utility-sector data from 2014 and 2015, this report documents how these programs have changed in the context of dynamic housing markets and statewide policy environments. The report also offers an analysis of the number, spending, offerings, and targeted participants of current programs and their potential for further expansion.

This summary from a Better Buildings Residential Network peer exchange call summary focused on leveraging smart tech, health and/or utility data to increase participation in multifamily energy efficiency programs. It featured speakers from The Network for Energy, Water and Health in
Affordable Buildings, New Ecology, Northwest Bronx Community and Clergy Coalition, and Emerald Cities Collaborative.

This report examines the history of pay-for-performance (P4P) energy efficiency approaches. As the report describes, there is a diverse spectrum of pay-for-performance programs but, at the most basic level, these programs track and reward energy savings as they occur, usually by examining data from a building's energy meters -- as opposed to the more common approach of estimating savings in advance of installation and offering upfront rebates or incentives in a lump-sum payment. The report finds that P4P has some important opportunities for increasing energy savings, but also key limitations that will need to be better understood through piloting and experimentation.

Each ResStock fact sheet presents the potential for residential energy and utility bill savings for the state. The top ten energy savings home improvements are highlighted.

In this presentation, state and nonprofit leaders in Colorado and Connecticut discuss their policy and program efforts to offer rooftop and community solar and weatherization services and how they are scaling their programs to meet the needs of the underserved income-eligible market.

This technical brief presents trends in the cost of saved electricity for energy efficiency programs between 2009 and 2013. For this report, LBNL collected and analyzed more than 5,400 program years of data collected in 36 states from 78 administrators of programs funded by customers of investor-owned utilities. These administrators provide efficiency programs to customers of investor-owned utilities that serve about half of total U.S. electricity load.

This summary from a Better Buildings Residential Network peer exchange call focused on how local governments have worked with trusted community organizations and their networks to drive demand. Speakers include the Natural Resources Defense Council and the Vermont Energy Investment Corporation.

This report focuses on six energy efficiency areas for state and local governments to improve the energy efficiency of existing commercial and multifamily buildings, which include strengthening market demand and expanding public-private partnerships.

The NorthernSTAR and U.S. Department of Energy Building America Program partnership investigated a new model to deploy building science-guided performance solutions to homeowners. This research explored three aspects to market delivery:
1. Understand the homeowner's motivations regarding investing in building science-based performance upgrades.
2. Determine a rapidly scalable approach to engage large numbers of homeowners directly through existing customer networks.
3. Access a business model that will manage all aspects of the contractor-homeowner performance professional interface to ensure good upgrade decisions throughout time.

The work presented in this webinar is a collaborative endeavor by the ARIES Building America team and two major affordable housing providers: Habitat for Humanity International and the factory building industry. The effort is exploring options for making major reductions in space conditioning energy use (≥ 50%) while holding the line on home affordability. Specifically, the project will develop a high-performance integrated design--effectively combining an ultra-efficient thermal envelope, a very low capacity, highly efficient mechanical system, an innovative distribution system, and affordable heat recovery ventilation--and set in motion steps to rapidly move this innovation to market.

This summary from a Better Buildings Residential Network peer exchange call focused on getting multifamily property owners on board with energy efficiency upgrades.

This paper is intended to guide state governments on Clean Power Plan compliance and shows how leading by example in state and local government programs communicates an agency’s commitment to reducing energy consumption, protecting facilities, and protecting taxpayer dollars.

This webcast highlight effective efforts by state and local agencies, non-profits, and utilities to bring energy efficiency and renewable energy (EE/RE) to low-income households.

This webcast in a multi-part series highlighting efforts by state and local agencies, non-profits, and utilities to bring energy efficiency and renewable energy (EE/RE) to low-income communities.

This is the second webinar in a multi-part series highlighting efforts by state and local agencies, non-profits, and utilities to bring energy efficiency and renewable energy (EE/RE) to low-income communities. This 90-minute webinar explored the specific challenges and opportunities faced by programs that aim to improve energy efficiency in multifamily affordable housing, with an emphasis on achieving multiple benefits through deeper retrofits.

Energy efficiency savings have grown substantially in the past ten years, and national leaders in program administration have emerged as savings levels have increased. This report reviews annual program performance for 14 leading energy efficiency program administrators, with a focus on costs, electricity savings, cost effectiveness, and portfolio design.

This report details opportunities for scaling up program activity and increasing savings from programs reaching the people who need it most. It discussed best practices from existing programs for overcoming many of the key challenges that program administrators face, including how to address housing deficiencies that prevent energy efficiency upgrades, how to address cost effectiveness challenges, and how to serve hard-to-reach households.

This summary from a Better Buildings Residential Network peer exchange call focused on targeted marketing strategies that can be used to craft successful outreach initiatives and communications. It also covered challenges and best practices for engaging specific demographics, including hard-to-reach market segments such as Hispanics, and provided insights into Hispanics relationship with energy.

This study focused on barriers to, and opportunities for, solar photovoltaic energy generation; opportunities for, access to other renewable energy by low-income customers; contracting opportunities for local small businesses in disadvantaged communities; low-income customers to energy efficiency and weatherization investments, including those in disadvantaged communities. It also provides recommendations on how to increase access to energy efficiency and weatherization investments to low-income customers.

This report explores how governments and energy efficiency implementers could help stakeholders better analyze and act upon building performance data to unlock savings.

Behavioral change programs are not necessarily a separate category of efficiency efforts; rather, behavioral approaches can be effectively integrated into all programs in residential, commercial, or industrial settings. As increased connectivity within homes and businesses expands opportunities to provide energy information, the role of behavior will likely become even more prominent. Consortium for Energy Efficiency, Inc. (CEE) provides this webpage dedicated to behavior change resources.

Several recent studies purport to show that particular energy efficiency programs and policies do not work or are too expensive. This short paper is written for people who are not evaluation experts and are trying to understand what conclusions they can take from these studies. We examine many of these papers and find that while they do have some useful findings, they often include a variety of unreasonable assumptions or outright mistakes that undermine their conclusions. Based on this review, we offer several recommendations on ways we can constructively move forward.

This webinar explored innovative measures Better Buildings Challenge partners have taken to improve water efficiency while reducing energy use. United Technologies Corporation discussed their impressive water reduction goals and best practices in managing water, while also focusing on energy management strategies at diverse manufacturing sites. The City of Atlanta discussed their new, high-efficiency pumping station and how the efforts of large-scale users to reduce water use can help the City reduce both water and energy use. InterContinental Hotels Group highlighted their worldwide water management program, which includes metering and tracking consumption and water efficiency strategies.

This summary from a Better Buildings Residential Network peer exchange call focused on how home energy upgrades can support electric vehicle adoption.

This white paper from Lawrence Berkeley National Laboratory describes the benefits and costs of energy advisors, and describes how residential energy efficiency programs have made use of them in their program design.

This guide is designed to help state and local governments reduce carbon emissions by connecting them with EPA programs that can help them expand or develop their own energy efficiency and renewable energy initiatives in ways that benefit low-income communities. The guide can also be used by low-income community leaders and stakeholder groups to better understand how they might participate in and take advantage of EPA initiatives to help their communities save energy.

Through field-testing and analysis, this project evaluated whole-building approaches and estimated the relative contributions of select technologies toward reducing energy use related to space conditioning in new manufactured homes. Three lab houses of varying designs were built and tested side-by-side under controlled conditions in Russellville, Alabama. The tests provided a valuable indicator of how changes in the construction of manufactured homes can contribute to significant reductions in energy use.

This summary from a Better Buildings Residential Network peer exchange call focused on approaches organizations can use to improve the efficiency and effectiveness of home upgrade programs, including strategies to streamline data entry and make continuous process improvements.

Combining health and home performance (HHP) offers unprecedented potential to increase market size and benefits. Poorly performing homes due to roofing, heating, electrical, or water issues, are associated with issues, such as respiratory illness, asthma, and injury. DOE is undertaking three initiatives: 1) A review of existing HHP literature; 2) Stakeholder engagement; and 3) Developing a roadmap to expand HHP.

This summary from a Better Buildings Residential Network peer exchange call focused on the ACEEE Summer Study, which brought together experts to discuss the technological basis for, and practical implementation of, actions to reduce energy use and the climate impacts associated with buildings.

The primary objective of the quantitative research phase of this survey was to get market-based feedback and insights in the following areas to assist the industry in better serving its constituents, including: insights as to major challenges that industry is facing and potential support that organizations could provide and feedback on how industry organizations could add value for constituents in the future.

This presentation covers Home Energy Reports (HER), a behavior change strategy, and conducting multilevel modeling to garner insights into which consumers drive energy savings.

This summary from a Better Buildings Residential Network peer exchange call focused on effective strategies to ensure that HVAC contractors do high-quality work and recommend the most appropriate systems for homeowners.

This summary from a Better Buildings Residential Network peer exchange call focused on effective messages to motivate homeowners to undertake upgrades over time.

This summary from a Better Buildings Residential Network peer exchange call focused on approaches organizations can use for moving homeowners from HVAC or other individual improvements to whole home upgrades and encouraging homeowners to undertake upgrades over time.

This literature review describes what is currently known about the occupant health benefits resulting from residential energy efficiency or work that is consistent with home performance upgrades. Of particular interest are the occupant health impacts associated with work typically conducted by the home performance industry, such as: air sealing and insulation; properly-sized, selected, matched, and installed energy efficient heating, ventilation, and air conditioning (HVAC) systems; identification and correction of moisture problems; proper whole house and room ventilation; lighting; and additional services including the replacement of appliances; measurement and installation of whole house and room air filtration systems (e.g., air purifiers); and basic pest exclusion. The intent of this literature review is to examine research that assessed work that would not be expected to harm residents or the workers.

Energy retrofits can harm or help resident health. Beyond preventing harm, this presentation covers how to use energy retrofits as an opportunity to improve the lives of your building residents and the surrounding community. It focuses on different ways that organizations are using energy efficiency to improve their communities through positive health outcomes and job creation.

A car is only as efficient as its driver and its mechanic; so, too, for buildings. This presentation covers best practices and reviews case studies on engaging building residents and training facilities managers to keep buildings running efficiently and meeting Better Buildings Challenge goals.

A recent cost vs. value report compared the average cost for popular remodeling projects with the value those projects retain at resale value in 100 different U.S. markets. This Home Energy article discusses how one of the most valuable remodeling options is one you can’t see--energy efficiency.

This summary from a Better Buildings Residential Network peer exchange call focused on innovative technology like ductless heat pumps and research in technology including wireless sensors for building monitoring applications and air-source heat pumps.

This summary from a Better Buildings Residential Network peer exchange call focused on opportunities and challenges in the Southeast and holistic, whole house approaches for working in hot and humid climates.

Energy efficiency programs can communicate with jargon and technical terminology, which puts off homeowners. However, marketing best practices suggest wording based on improved consumer experience is more effective. This presentation covers seven proven communications strategies for causing behavior change.

Better Buildings Home Upgrade Program Accelerator partners, Build It Green, Enhabit, and NeighborWorks of Western Vermont, discussed steps for streamlining program processes, and strategies to improve data management, contractor relationships, and customer experiences. Tools and resources were presented as examples of how these ideas can be implemented in programs across the country.

This document features lessons learned shared by Better Buildings Residential Network members during Peer Exchange Calls held during Autumn 2016.

This document features lessons learned shared by Better Buildings Residential Network members during Peer Exchange Calls held during Fall 2015.

This document features lessons learned shared by Better Buildings Residential Network members during Peer Exchange Calls held in Winter 2016.

This document features lessons learned shared by Better Buidlings Residential Network members during Peer Exchange Calls held during Spring 2016.

This publication summarizes lessons learned from Peer Exchange Calls about how energy efficiency programs and partners can leverage timing to engage homeowners.

Energy burden is the percentage of household income spent on home energy bills. In this report, ACEEE, along with the Energy Efficiency for All coalition, measures the energy burden of households in 48 of the largest American cities. The report finds that low-income, African-American, Latino, low-income multifamily, and renter households all spend a greater proportion of their income on utilities than the average family. The report also identifies energy efficiency as an underutilized strategy that can help reduce high energy burdens by as much as 30%. Given this potential, the report goes on to describe policies and programs to ramp up energy efficiency investments in low-income and underserved communities.

The Better Buildings Home Energy Information Accelerator aims to make energy data more accessible to home buyers, realtors and others. This presentation covers how Colorado launched a statewide residential labeling initiative that made home energy data available at point of sale, and how partnerships in the Northeast are incorporating energy efficiency into the Multiple Listing Service (MLS), with Vermont pioneering the regional effort.

This report was developed to help inform national stakeholders about the strategies that have been used to achieve deep energy savings in the multifamily housing sector through energy efficiency upgrades. These strategies could be used as models in areas where utility program administrators and policymakers seek to achieve deep energy savings in the multifamily building stock for the purposes of reducing energy costs, creating comfortable and healthy homes, meeting regulatory requirements, or reducing the environmental impacts of energy consumption. This report includes a national multifamily market characterization, barriers and opportunities for program and policy efforts, and eight exemplary case studies from across the country.

The research described in this report holds great potential to significantly improve the process for including energy efficiency in developing and implementing federally funded multifamily rehabilitation projects through the USDA, the U.S. Housing and Urban Development (HUD) Low Income Housing Tax Credit, and other programs.

The benefits of energy efficiency upgrades beyond money and energy savings include non-energy benefits that are often not communicated well. Multiple non-energy benefits include lower home maintenance costs, improved air quality and less sick days for adults and children, greater resiliency, and lower emissions. This presentation covers examples of how your program can fully realize the potential from all of these multiple non-energy benefits.

This presentation highlights the work and resources of the Energy Efficiency For All (EEFA) project and its mission to make multifamily homes healthy and affordable through energy efficiency. The families and individuals most in need of affordable housing are also most affected by high energy costs. Low-income families spend up to 20 percent of their income on energy. Efficiency investments in multifamily affordable housing mean energy savings, lower energy bills, more stable rental payments, reduced pollution, and a better quality of life for residents.

This presentation explains non-energy benefits from residential energy efficiency programs, including those associated with households, ratepayer or taxpayers, and societal benefits. Also presented is a framework for measurement and monetization of health benefits, economic benefits, and environmental benefits (e.g. avoided emissions) and a case study of New Jersey's Clean Energy Program.

Residential air-source heat pumps (ASHP) are a heating and air-conditioning technology that use electricity to provide a combination of space heating and cooling to homes. A new generation of ASHPs has come to market over the past five years. This report evaluates the key market barriers as well as potential opportunities to leverage. Based on an assessment of the regional ASHP market, it is clear that while ASHPs have established a viable and growing market, there remains a significant opportunity to further accelerate adoption of the technology and in the process achieve energy and cost savings to the Northeast and Mid-Atlantic region.

This summary from a Better Buildings Residential Network peer exchange call focused on strategies that can be used to promote energy efficiency programs for manufactured homes. Speakers include Collaborative Efficiency, Wisconsin Energy Conservation Corporation, and East Kentucky Power Cooperative.

Energy efficiency data can inform real estate transactions – including underwriting and appraisal, but each sector relies on its own sets of tools, data and specifications. The Home Energy Information Accelerator addresses how reliable energy information can get into the hands of decision-makers, and what types of policy, technical, and other changes are needed to make energy information useful in the real estate transaction.

This report, informed by leading research and real-world examples, highlights practical online and in-person tactics that contractors can use to promote social interaction and social comparison among homeowners to make energy upgrades a "must-have" in U.S. homes.

The U.S. Department of Energy's (DOE) Building America research team, Advanced Residential Integrated Energy Solutions Collaborative (ARIES), worked with four public housing authorities (PHAs) to develop packages of energy-efficiency retrofit measures that PHAs can cost-effectively implement with their own staffs during the normal course of housing operations when units are refurbished between occupancies. More than 1 million public housing units supported by the U.S. Department of Housing and Urban Development (HUD) provide rental housing for eligible low-income families across the country, ranging from single-family houses to multifamily, high-rise apartments.

The multifamily sector can be hard to reach when it comes to energy efficiency programs. Besides being diverse and complex, the sector presents a unique set of challenges to efficiency investments. The result is that multifamily customers are often underserved by energy efficiency programs. Drawing on data requests and interviews with program administrators, this report summarizes the challenges to program participation and identifies best practices that programs can use to reach and retain large numbers of multifamily participants.

Energy efficiency is good for you--and for the air you breathe, the water you drink, and the community in which you live. This fact sheet shows how saving energy reduces air and water pollution and conserves natural resources, which in turn creates a healthier living environment for people everywhere. It includes the stories of a family in Pennsylvania and a hospital in Florida.

This guide for states highlights energy efficiency as a least-cost strategy to meet air pollution reduction and other policy objectives, including energy affordability and reliability. It presents established policy and program “pathways” to advance demand-side energy efficiency.

This presentation covers Elevate Energy's full service comprehensive approach for improving low income multifamily housing.

This report provides information and tools for policymakers, regulators, utilities, shared renewable energy developers, program administrators and others to support the adoption and implementation of shared renewables programs specifically designed to provide tangible benefits to low income and moderate income individuals and households.

This report explains the psychology of individual energy efficiency actions, and how large scale behavior change programs can use this research to reduce greenhouse gas emissions.

Building on the strategy of creating a sustainable workplace, many companies have been focusing their efforts on developing a sustainable workforce. This approach to combining sustainability initiatives and employee engagement creates a value chain that has positive impacts for employers and employees alike and the communities they live in.

This summary from a Better Buildings Residential Network peer exchange call focused on combining energy and health-related services.

Property Assessed Clean Energy (PACE) programs provide affordable and accessible financing for home energy efficiency upgrades that improve value, comfort and durability, and create jobs. PACE is a scalable financing mechanism with over 50,000 projects and $1 billion invested in California, and multifamily housing projects in New York and other states. This session discussed successful PACE programs, designs, and FHA's guidance.

Home energy management systems (HEMS) continue to present a unique opportunity and challenge. While energy savings have been documented for many HEMS, some of the most promising opportunities from these devices and systems can be found in the internet of things (IoT) and smart home technologies. This report presents market updates, a regional goal, and strategies to drive market transformation and achieve the many benefits from HEMS and the Smart Energy Home.

The Better Buildings Neighborhood Program featured 41 competitively selected grantees that developed sustainable energy efficiency upgrade programs across the U.S. from 2010-14. This presentation covers what worked and what didn’t, and key success factors identified by an independent evaluation.

This article highlights the importance of communicating to homeowners about the non-energy benefits of energy efficiency improvements such as better comfort, improved indoor air quality, reduced allergies, and a safer, healthy home. It also discussed that non-energy benefits are an undervalued and often overlooked component of energy efficiency upgrades and need to be a part of energy efficiency program's and contractors' sales strategies.

This report represents NEEP’s annual assessment of the major policy developments of 2014, as well as its look into the immediate future, where NEEP gauge states’ progress toward capturing cost-effective energy efficiency as a first-order resource. While looking at the region as a whole, NEEP also provides summary and analysis of some of the biggest building energy efficiency successes and setbacks from Maine to Maryland — including significant energy efficiency legislation and regulations and changes in funding levels for energy efficiency programs.

This Guide is designed to help state and local policymakers to take full advantage of new policy developments by providing them with a comprehensive set of tools to support launching or accelerating residential energy efficiency programs. The Guide focuses on four categories of policies that have proven particularly effective in providing a framework within which residential energy efficiency programs can thrive: incentives and financing, making the value of energy efficiency visible in the real estate market, data access and standardization, and supporting utility system procurement of energy efficiency.

This report is targeted at both policymakers and program administrators who are less familiar with secondary markets and their significance in the energy efficiency context, as well as those that are more familiar with these concepts and may be actively considering secondary market strategies. It covers how efficient access to capital from secondary markets -- reselling energy loans to investors to replenish program funds -- is being advanced as an important enabler of the energy efficiency industry “at scale.”

This report covers how customer satisfaction translates into real and tangible value for power and utility companies and is better for business.

This summary from a Better Buildings Residential Network peer exchange call focused on the benefits, business case, challenges, and strategies of multifamily energy upgrades.

Real estate professionals are increasingly aware that today’s homebuyers consider heating and cooling costs, efficient appliances, and efficient lighting to be important factors in home purchase decisions. Residential energy efficiency and real estate stakeholders, however, agree that the home resale process frequently fails to account for the value of high-performance home features. If investments in energy efficiency were more accurately reflected in home resale prices, homeowners could have greater confidence that these investments would be recouped at resale, and they might make more investments in efficiency.

Energy efficiency collaboratives vary greatly and are typically designed for a specific jurisdiction, making them hard to compare side by side. This guide seeks to highlight a few common elements and draw conclusions on the overall effectiveness of specific characteristics of collaboratives. This guide defines and examines four different types of collaboratives in terms of their origin, scope, decision-making method, membership, duration, available resources, and how they interact with and influence their respective commissions.

This summary from a Better Buildings Residential Network peer exchange call focused on fostering behavior change in the energy efficiency market.

This guide provides recommended benchmarking metrics for measuring residential program performance.

This summary from a Better Buildings Residential Network peer exchange call focused on how to leverage HVAC upgrades into deeper home upgrades.

The Consortium for Energy Efficiency has collected information from its membership for each of the past four years on the behavior-based programs currently underway and how these programs are being evaluated. This presentation describes the annual data collection effort and highlight the key findings of this research to date. Results discussed will consider the social science knowledge most commonly incorporated into the programs captured, as well as methods used for program evaluation and overarching lessons learned from the program administrator community.

This report discusses how low income communities can be transformed through energy efficiency. Many of our fellow citizens face energy costs that are excessive compared with their overall incomes, yet they cannot afford to invest in the energy efficiency measures that would reduce their energy cost burden. Families nationwide are often forced to choose between necessities such as food or medications and paying their energy bills to heat and cool their homes. Private and public resources are available to help Americans, but these resources reach only a small percentage of underserved households.

This summary from a Better Buildings Residential Network peer exchange call focused on the advantages, challenges, and effective creation and management of statewide energy efficiency alliances.

The MF HERCC Recommendations Report 2015 Update expands the 2011 publication, and delivers explicit and refined recommendations for multifamily energy efficiency program administrators and implementers.

The purpose of this report is to demonstrate the potential for HEMS as an evolving avenue to deeper residential energy savings, and it explains, in detail, the variations and characteristics of HEMS; what the market is and who the major market players are; what the major barriers to implementation look like; and finally, it attempts to outline potential program solutions with HEMS at the core of the strategy.

This guide identifies 12 best practices for policymakers, regulators, and program administrators to help building owners invest to increase the energy efficiency of multifamily affordable housing.