Skip to Content

ACEEE | American Council for an Energy-Efficient Economy

Issues

ACEEE’s work spans seven core focus areas and a range of related topics. Explore the issues shaping energy efficiency today.

Focus Areas

Our main areas of research

Affordability and Energy Equity

Behavior and Health

Energy Efficiency Policy

Homes and Buildings

Industry and Manufacturing

Utilities and the Power Sector

Featured Research Topics

Specific themes and technologies

Appliances and Equipment

Building Policies and Codes

Decarbonization

Industrial Heat

Low-Income Energy Efficiency Programs

Homes and Multifamily Buildings

Efficiency, Flexibility, and Rate Design Programs

Research & Publications

Research & Publications

Research that drives efficiency forward.

See all resources

Research Reports

Research Reports

Briefs

Toolkits

Fact Sheets

Public Filings & Testimony

Public Filings & Testimony

Scorecards

What Is Energy Efficiency?

Donate Join

News & Insights

Summer Study Proceedings

Focus Areas

Affordability and Energy Equity

Behavior and Health

Energy Efficiency Policy

Homes and Buildings

Industry and Manufacturing

Utilities and the Power Sector

Featured Research Topics

Appliances and Equipment

Building Policies and Codes

Decarbonization

Industrial Heat

Low-Income Energy Efficiency Programs

Homes and Multifamily Buildings

Efficiency, Flexibility, and Rate Design Programs

Research & Publications

Research Reports

Public Filings & Testimony

What Is Energy Efficiency?

Donate Join

News & Insights

Summer Study Proceedings

Search

Summer Study Proceeding Paper

Residential Heat Pump with 3-Pipe Heat Recovery for DHW and Space Conditioning – Energy and Performance Results and Findings

Download PDF

Authors

Edward Louie, Fatih Evren, Abinesh Selvacanabady, Alexander Rees

Share

Get updates from ACEEE

Name(Required)

First Last

Email(Required)

ACEEE | American Council for an Energy-Efficient Economy

The American Council for an Energy-Efficient Economy (ACEEE), a nonprofit research organization, develops policies to reduce energy waste and combat climate change. Its independent analysis advances investments, programs, and behaviors that use energy more effectively and help build an equitable clean energy future.

LinkedIn

Threads

Instagram

Bluesky

Facebook

YouTube

Research & Publications

News & Insights

Summer Study Proceedings

Media Inquiries

Donate Join

©ACEEE 2026 All rights reserved.

Made with by creatives with a conscience

Share

X

Facebook

LinkedIn

Email

Reddit