Energy efficiency companies in Connecticut focus on optimizing resource use for homes and businesses. This industry includes firms that specialize in energy audits, solar installations, HVAC solutions, and building performance consulting. With growing emphasis on sustainability and reducing greenhouse gas emissions, these companies are increasingly integrating advanced technologies and energy management systems into their offerings. Future trends point towards innovative strategies around electric vehicle integration and smart energy solutions, positioning the industry to play a crucial role in Connecticut's transition to cleaner energy practices.

This list features 23 energy efficiency companies located throughout Connecticut, highlighting firms that vary in size from small teams to medium enterprises. Established between 1972 and 2023, these companies are located in cities like Norwalk, Shelton, and Hartford, each specializing in various services, such as installation, consulting, and energy management. Their collective expertise contributes to enhanced energy efficiency across residential and commercial sectors.

Continue reading to explore the top energy efficiency companies in Connecticut.

Top 23 Energy Efficiency Companies in Connecticut

1. Steven Winter Associates

• Website: swinter.com
• Ownership type: Private
• Headquarters: Norwalk, Connecticut, United States (USA)
• Employee distribution: United States (USA) 99%, Other 1%
• Founded year: 1972
• Headcount: 51-200
• LinkedIn: steven-winter-associates

Steven Winter Associates, Inc. is a consulting firm based in Norwalk, Connecticut, founded in 1972. The company specializes in building performance, offering a range of services that include energy efficiency consulting, sustainability solutions, and accessibility compliance. They serve a variety of clients, including residential and commercial developers, architects, and building owners. SWA has played a significant role in shaping industry standards, having certified nearly 1,000 LEED Homes projects on the East Coast and actively participating in programs like the U.S. Department of Energy's Building America initiative. Their expertise extends to energy optimization for existing buildings and new construction, ensuring that projects meet rigorous energy codes and sustainability benchmarks. SWA's commitment to improving building performance is evident in their comprehensive approach to energy efficiency, which includes energy modeling, mechanical system design, and green building certification. They also focus on educating clients and stakeholders about best practices in energy efficiency and sustainability.

2. EcoSmart Home Services

• Website: ecosmartct.com
• Ownership type: Private
• Headquarters: Berlin, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1985
• Headcount: 11-50
• LinkedIn: ecosmart-home-services

EcoSmart Home Services, based in Berlin, Connecticut, has been a prominent player in the home improvement sector since its founding in 1985. The company specializes in energy efficiency solutions, offering a comprehensive range of services that include solar panel installations, energy audits, HVAC systems, insulation, and electrical work. With a dedicated team of professionals, EcoSmart aims to help homeowners reduce their energy costs and improve their home's comfort through sustainable practices. Their commitment to eco-friendly solutions is evident in their approach to energy audits, where they assess energy consumption and identify areas for improvement. EcoSmart also provides educational resources to empower homeowners in making informed energy decisions. The company has built a reputation for quality service and customer satisfaction, making it a trusted name in the Connecticut community.

3. Automated Building Systems, Inc.

• Website: absddc.com
• Ownership type: Private
• Headquarters: Glastonbury, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1986
• Headcount: 51-200
• LinkedIn: automated-building-systems-inc.

Automated Building Systems, Inc. is a service provider based in Glastonbury, Connecticut, specializing in energy efficiency and building management solutions. Founded in 1986, the company has built a reputation for delivering tailored energy solutions to commercial clients, including schools, hospitals, and office buildings. Their service offerings include building automation, energy procurement, EV charging stations, HVAC energy improvements, LED lighting and controls, solar solutions, and steam system optimization. With a team of experienced engineers, Automated Building Systems focuses on analyzing client needs and developing customized plans to enhance energy efficiency and reduce operational costs. The company operates with a commitment to ethical business practices and strives to stay at the forefront of energy-efficient technologies. Their long history in the industry and comprehensive service portfolio position them as a significant player in the energy efficiency sector.

4. Budderfly

• Website: budderfly.com
• Ownership type: Private Equity
• Headquarters: Shelton, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: Other (Debt), $200.0M, January 2024
• Founded year: 2007
• Headcount: 201-500
• LinkedIn: budderfly-inc

Budderfly, founded in 2007 and based in Shelton, Connecticut, is an energy efficiency company that provides innovative solutions aimed at reducing energy consumption and carbon emissions for businesses. The company primarily serves sectors such as hospitality, healthcare, and retail, offering services that include energy management, equipment upgrades, and continuous monitoring. Budderfly operates on an energy-as-a-service model, which allows clients to implement energy-efficient technologies without incurring upfront costs. This model not only facilitates immediate savings but also fosters long-term partnerships focused on sustainability goals. With a workforce of approximately 317 employees, Budderfly has made significant strides in the industry, having invested over $80 million in facility upgrades and achieving an average of 19% carbon savings annually for its clients. The company has also recently secured $200 million in funding, further solidifying its position in the market and enabling continued innovation in energy management solutions.

5. Energy Resources USA

• Website: energyresourcesusa.net
• Ownership type: Private
• Headquarters: Thomaston, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2011
• Headcount: 51-200
• LinkedIn: energy-resources-usa

Energy Resources USA, based in Thomaston, Connecticut, is a private company founded in 2011. It specializes in energy efficiency and renewable energy solutions, providing a comprehensive suite of services aimed at reducing energy costs and enhancing operational efficiency for its clients. The company offers innovative solutions such as electric vehicle charging stations, LED lighting, mechanical equipment controls, refrigeration optimization, steam optimization, and solar energy systems. They cater to a variety of sectors, including commercial, education, healthcare, manufacturing, and nonprofits. Energy Resources USA collaborates with utility companies to deliver turnkey projects, managing everything from initial assessments to installation and incentive processing. Their mission is to empower clients to profit through efficiency, making a significant impact on energy conservation efforts across the Northeast and Mid-Atlantic regions.

6. New England Smart Energy Group, LLC

• Website: ne-smartenergy.com
• Ownership type: Private
• Headquarters: Fairfield, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2009
• Headcount: 11-50
• LinkedIn: new-england-smart-energy-group-llc

New England Smart Energy Group, LLC, based in Fairfield, Connecticut, is a private company founded in 2009. The firm specializes in providing energy efficiency solutions tailored for residential customers. Their offerings include comprehensive home energy assessments, insulation and air sealing services, HVAC upgrades, and window replacements. The company is dedicated to helping homeowners reduce energy consumption and lower utility bills while promoting sustainable energy practices. As an authorized contractor for the Energize Connecticut program, New England Smart Energy Group assists clients in accessing rebates and incentives, enhancing the affordability of energy-efficient upgrades. With a team of 15 employees, the company has established itself as a trusted resource for energy efficiency improvements in the local community, having served thousands of homeowners and landlords since its inception.

7. Greenworks Lending from Nuveen

• Website: greenworkslending.com
• Ownership type: Private Equity
• Headquarters: Darien, Connecticut, United States (USA)
• Latest funding: February 2021
• Founded year: 2015
• Headcount: 51-200
• LinkedIn: greenworks-lending

Greenworks Lending from Nuveen, also known as Nuveen Green Capital, is a financing company based in Darien, Connecticut. Founded in 2015, the firm specializes in providing Commercial Property Assessed Clean Energy (C-PACE) financing solutions. This innovative financing model allows commercial property owners and developers to secure long-term, low-cost funding for energy efficiency upgrades, solar installations, and other renewable energy initiatives. With over $2.5 billion originated in financing, Nuveen Green Capital has established itself as a significant player in the sustainable commercial real estate financing market. Their services not only help clients enhance property value but also contribute to reducing operating costs and promoting environmental sustainability. The company operates in 38 states and the District of Columbia, actively engaging in C-PACE policy development and expanding its reach to emerging markets. Their commitment to financing energy-related projects underscores their role in advancing energy efficiency across various commercial sectors.

8. Connecticut Home Solutions

• Website: cthomesolutions.net
• Ownership type: Private
• Headquarters: Wallingford, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2011
• Headcount: 11-50
• LinkedIn: ct-home-solutions

Connecticut Home Solutions, LLC, based in Wallingford, Connecticut, is a private company founded in 2011 that specializes in home energy efficiency solutions. The firm provides a range of services, including insulation, air sealing, and comprehensive energy audits, aimed at helping homeowners reduce energy costs and enhance comfort within their homes. Connecticut Home Solutions works closely with local utility companies to facilitate rebates and financing options, making energy efficiency upgrades more accessible to residents. Their services are particularly beneficial for older homes, which often suffer from inadequate insulation and air sealing. The company is also involved in the Energize Connecticut initiative, which offers various energy efficiency programs funded through utility fees. This collaboration allows them to provide significant savings and incentives to homeowners, further solidifying their role in the energy efficiency industry.

9. ESC - Environmental Systems Co. - A Fidelity Company

• Website: esccontrols.com
• Ownership type: Corporate
• Headquarters: West Hartford, Connecticut, United States (USA)
• Latest funding: July 2023
• Founded year: 1972
• Headcount: 51-200
• LinkedIn: environmental-systems-corporation

Environmental Systems Co. (ESC), a Fidelity Company, has been operational since 1972 and is based in West Hartford, Connecticut. The company provides building technology services aimed at improving building performance through integrated solutions. Their offerings include energy solutions, mechanical services, security systems, and audio-visual technology, catering to facility owners and managers across various sectors. ESC's energy solutions division focuses on reducing energy costs and consumption, conducting facility assessments to identify opportunities for improvement, and leveraging utility incentives to support project implementation. Their recent acquisition of Compressor Energy Services highlights their commitment to optimizing energy systems, particularly in industrial settings. With a team of over 150 professionals, ESC has established a reputation for delivering high-quality products and services that enhance operational efficiency and reduce environmental impact.

10. Dr. Energy Saver

• Website: drenergysaver.com
• Ownership type: Private
• Headquarters: Seymour, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2010
• Headcount: 11-50
• LinkedIn: dr.-energy-saver

Dr. Energy Saver, founded in 2009 and based in Seymour, Connecticut, is a home energy contractor dedicated to enhancing energy efficiency in residential properties. The company offers a comprehensive range of services, including insulation installation, heating and cooling system maintenance, and detailed energy audits. Their approach is centered on identifying specific energy issues within homes and providing customized solutions to improve comfort and reduce energy costs. Dr. Energy Saver operates a network of over 100 trained and certified contractors across the United States, ensuring that homeowners receive expert assistance tailored to their unique needs. The company emphasizes the importance of education and training, utilizing a state-of-the-art facility for ongoing contractor development. This commitment to quality and customer satisfaction has positioned Dr. Energy Saver as a notable entity in the energy efficiency sector.

11. ELM Consulting

• Website: elmconsulting.energy
• Ownership type: Private
• Headquarters: Darien, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2015
• Headcount: 1-10
• LinkedIn: e-l-m-consulting

ELM Consulting, based in Darien, Connecticut, is a consulting firm that specializes in energy efficiency and sustainability solutions. Established in 2015, the company offers a comprehensive suite of services designed to help businesses and organizations optimize their energy use and achieve their sustainability goals. Their offerings include ESG consulting, energy auditing, and utility incentive procurement, among others. ELM Consulting has been actively involved in various projects, securing over $3.2 million in utility incentives for clients, which highlights their capability in navigating complex energy efficiency programs. The firm works with a range of clients, from residential homeowners to large commercial developers, ensuring that energy efficiency measures are effectively implemented across different sectors. Their approach emphasizes long-term financial and environmental benefits, making them a valuable partner for organizations looking to enhance their energy performance.

12. Titan Energy

• Website: titanenergyne.com
• Ownership type: Corporate
• Headquarters: Hartford, Connecticut, United States (USA)
• Employee distribution: United States (USA) 74%, Democratic Republic of the Congo 9%, Mexico 9%, Other 9%
• Latest funding: December 2014
• Founded year: 2001
• Headcount: 11-50
• LinkedIn: titanenergynewengland

Titan Energy, based in Hartford, Connecticut, is an energy consulting firm founded in 2001. The company specializes in providing comprehensive energy management solutions tailored to a variety of clients, including educational institutions, healthcare facilities, and government entities. Titan Energy focuses on optimizing energy procurement and efficiency strategies, aiming to reduce energy costs while promoting sustainable practices. Their service offerings include energy procurement, demand response, data management, and on-site generation technologies such as solar, combined heat and power (CHP), and fuel cells. They also engage in community solar initiatives and provide energy efficiency solutions like LED lighting and electric vehicle charging stations. Titan Energy's approach is data-driven, allowing clients to control and reduce energy costs effectively. They have established a reputation for being responsive and client-focused, as evidenced by positive testimonials from various sectors. The company operates independently, ensuring that their recommendations are unbiased and tailored to the specific needs of their clients.

13. Lantern Energy

• Website: lanternenergy.com
• Ownership type: Private
• Headquarters: Norwich, Connecticut, United States (USA)
• Founded year: 2009
• Headcount: 51-200
• LinkedIn: lantern-energy

Lantern Energy, founded in 2009 and based in Norwich, Connecticut, is a private energy solutions provider that specializes in energy efficiency and electrical services. The company offers a comprehensive suite of services, including energy assessments, solar installations, and electrical upgrades, catering to both residential and commercial customers in Connecticut and Massachusetts. Lantern Energy aims to help clients reduce energy costs and enhance efficiency through tailored solutions. The company is accredited by the Building Performance Institute, ensuring that its crew leaders possess a solid understanding of building science and energy efficiency practices. Lantern Energy is also involved in various industry initiatives, such as the Home Performance with ENERGY STAR® Program and the Mass Save® Program, which further demonstrates its commitment to promoting energy efficiency. Their focus on customer service and support throughout the project phases, along with financing options for energy improvements, underscores their role in facilitating energy efficiency advancements in the community.

14. Green Energy Solutions

• Website: greenenergy-inc.com
• Ownership type: Private
• Headquarters: Windsor Locks, Connecticut, United States (USA)
• Employee distribution: India 72%, Malawi 14%, Kenya 14%
• Founded year: 1981
• Headcount: 11-50
• LinkedIn: getgreeninc

Green Energy Solutions Inc. is an energy conservation consulting firm based in Windsor Locks, Connecticut. Founded in 1981, the company has built a solid reputation over the years by helping businesses reduce their energy consumption through equipment upgrades and practical solutions. They specialize in various areas, including lighting, refrigeration, HVAC, and solar technologies, ensuring that their clients receive cost-effective services that yield a good return on investment. With a focus on practical applications, Green Energy Solutions has been involved in energy conservation projects since 1989, showcasing their extensive experience in the field. The company prides itself on providing quality service through its own licensed personnel for installation and maintenance, avoiding subcontracting except for highly specialized services. This approach allows them to maintain control over the quality of their work and ensure customer satisfaction. Over the years, they have served hundreds of satisfied customers, reflecting their commitment to delivering effective energy conservation solutions.

15. Globele Energy, LLC

• Website: globeleenergy.com
• Ownership type: Private
• Headquarters: New Haven, Connecticut, United States (USA)
• Founded year: 2009
• Headcount: 1-10
• LinkedIn: globele-energy-llc

Globele Energy, LLC, founded in 2009 and based in New Haven, Connecticut, is a private energy consulting firm dedicated to enhancing energy efficiency for commercial and industrial clients. With a small team of around 19 employees, the company prides itself on providing personalized services that cater to the unique energy needs of its clients. Globele Energy offers a range of services, including energy audits, custom energy pricing, and solar energy generation assessments. They are recognized as an AEE Certified & Utility approved energy auditor, which underscores their expertise in delivering independent and unbiased recommendations for energy efficiency and conservation. The firm has also partnered with local organizations, such as the Greater New Haven Chamber of Commerce, to provide customized energy solutions, showcasing their commitment to community engagement and support. With over 35 years of collective experience in the energy industry, Globele Energy aims to simplify the complexities of energy management for its clients, ultimately helping them save money and resources.

16. Aramark Engineering Solutions

• Website: aramarkengineering.com
• Ownership type: Private
• Headquarters: Guilford, Connecticut, United States (USA)
• Employee distribution: United States (USA) 85%, Ireland 11%, Canada 2%, Other 2%
• Founded year: 1973
• Headcount: 51-200
• LinkedIn: aramark-engineering-solutions

Aramark Engineering Solutions, based in Guilford, Connecticut, is a private engineering solutions provider founded in 1973. The company specializes in construction services, energy management, and building commissioning, primarily serving educational institutions and healthcare facilities. With a workforce of approximately 328 employees, Aramark Engineering Solutions focuses on enhancing building performance and reducing operational costs through innovative solutions. Their energy management initiatives have led to substantial savings, with reported energy and emission reductions ranging from 10% to 45%. The company also emphasizes improving indoor air quality and ensuring compliance with health and environmental standards, making them a key player in the energy efficiency industry.

17. Bridge Energy Services

• Website: bridgeenergy.com
• Ownership type: Private
• Headquarters: East Hartford, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2002
• Headcount: 1-10
• LinkedIn: bridge-energy-services-llc

Bridge Energy Services, based in East Hartford, Connecticut, is an energy consulting firm established in 2002. With a small team of around 17 employees, the company has carved out a niche in energy management and procurement. They provide customized solutions aimed at optimizing energy use and reducing costs for clients across various sectors, including healthcare, education, and municipalities. Their service offerings include energy procurement, on-site generation, battery storage, and sustainability strategies. Bridge Energy is particularly focused on helping clients navigate the complexities of energy markets, ensuring they can achieve their sustainability goals while managing costs effectively. The firm has built strong relationships with key stakeholders in the energy sector, which enhances their ability to deliver value to clients. They have been active in advising large energy consumers on how to implement effective energy strategies, thereby contributing to overall energy efficiency in the northeastern United States.

18. Controlled Air, Inc

• Website: controlledair.com
• Ownership type: Family Owned
• Headquarters: Branford, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1980
• Headcount: 51-200
• LinkedIn: controlled-air-inc

Controlled Air, Inc., based in Branford, Connecticut, has been a family-owned business since its founding in 1980. The company specializes in commercial HVAC services, focusing on energy-efficient heating, ventilation, and air conditioning solutions. They cater to various sectors, including education and healthcare, ensuring comfortable indoor environments while promoting energy conservation. Their services range from installation and maintenance to building automation. Recently, Controlled Air became part of Yanmar America, which allows them to expand their offerings and enhance their engineering capabilities. They are also involved with the Connecticut Green Building Council, supporting efforts to achieve LEED certification for high-performance buildings. Their commitment to energy efficiency is evident in their design philosophy and the technologies they employ.

19. Home Comfort Practice

• Website: homecomfortpractice.com
• Ownership type: Family Owned
• Headquarters: Stratford, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2016
• Headcount: 11-50
• LinkedIn: home-comfort-practice

Home Comfort Practice, based in Stratford, Connecticut, is a family-owned home improvement contractor that specializes in energy efficiency services. Established in 2016, the company offers a range of solutions aimed at enhancing home comfort while reducing energy costs. Their services include comprehensive energy audits, insulation installation, air sealing, and HVAC solutions. Home Comfort Practice is an authorized contractor for Energize Connecticut, which allows them to connect clients with various rebates and financial incentives for energy-efficient upgrades. The company prides itself on its customer-centric approach, ensuring that clients receive tailored solutions that meet their specific needs. With a team of certified technicians, Home Comfort Practice employs advanced diagnostic tools to identify energy waste and recommend effective improvements. Their commitment to quality and customer satisfaction has earned them a reputation for excellence in the energy efficiency sector.

20. Tradition Energy

• Website: traditionenergy.com
• Ownership type: Private
• Headquarters: Stamford, Connecticut, United States (USA)
• Employee distribution: United States (USA) 79%, Singapore 10%, United Kingdom (UK) 5%, Other 6%
• Founded year: 1986
• Headcount: 201-500
• LinkedIn: tradition-energy

Tradition Energy, based in Stamford, Connecticut, is an energy consulting firm that specializes in energy risk management, procurement, and sustainability solutions. Founded in 1986, the company has built a reputation for helping a wide range of clients, including commercial, industrial, and governmental organizations, navigate the complexities of energy expenditures. With a focus on sustainability, Tradition Energy provides tailored solutions that assist clients in implementing renewable energy strategies and managing their energy costs effectively. The firm has managed over 124 billion kWh in energy usage and more than $131 billion in energy spend, showcasing its extensive market knowledge and expertise. Tradition Energy is part of the Tradition Group, which operates globally in financial products and commodities, further enhancing its capabilities in the energy sector. Their innovative tools, such as the Tradition Energy Pricing System (TEPS), facilitate competitive pricing and transparency for clients, while their sustainability solutions address critical needs in the transition to cleaner energy sources.

21. SSHC inc.

• Website: sshcinc.com
• Ownership type: Private
• Headquarters: Westbrook, Connecticut, United States (USA)
• Founded year: 1989
• Headcount: 11-50
• LinkedIn: sshc-inc-

SSHC Inc., based in Westbrook, Connecticut, has been operational since 1989, focusing on electric radiant heating systems. The company manufactures and distributes its own branded products, notably the ENERJOY Radiant Heatmodules, which cater to residential, commercial, and industrial heating needs. Their systems are designed to provide comfort while significantly reducing energy consumption, with documented savings of up to 52% compared to conventional heating methods. SSHC Inc. is recognized for its commitment to energy efficiency, having received the E Seal Certificate of Recognition for its marketing leadership in energy and environmental criteria. The company is also involved in educational efforts within the industry, with its president co-authoring a comprehensive handbook on radiant heating and cooling. SSHC Inc. is a member of professional organizations such as the Radiant Panel Association and ASHRAE, further solidifying its role in advancing energy-efficient heating solutions.

22. Lightstat

• Website: lightstat.com
• Ownership type: Private
• Headquarters: Barkhamsted, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1996
• Headcount: 11-50
• LinkedIn: lightstat-inc-

Lightstat, founded in 1996 and based in Barkhamsted, Connecticut, is a private company that specializes in energy management solutions. With a workforce of 11 to 50 employees, Lightstat has carved out a niche in the energy efficiency sector by offering a range of products, including programmable thermostats and advanced lighting controls. Their clientele spans various industries, such as retail, government, and education, all seeking to optimize energy usage and reduce operational costs. The company also provides cloud-based software services that facilitate remote monitoring and management of energy systems. This capability is particularly valuable for organizations looking to enhance their energy efficiency practices. Lightstat's products are designed to meet stringent energy code requirements, and they are compliant with California Title 24 regulations, showcasing their commitment to quality and regulatory standards. Their extensive experience in environmental controls positions them as a knowledgeable entity in the energy efficiency market.

23. JKMuir - Energy & Sustainability in Public Infrastructure

• Website: jkmuir.com
• Ownership type: Private
• Headquarters: Rocky Hill, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2008
• Headcount: 11-50
• LinkedIn: jkmuir

JKMuir - Energy & Sustainability in Public Infrastructure is an engineering consulting firm based in Rocky Hill, Connecticut, established in 2008. The company specializes in providing energy management and sustainability solutions tailored for municipal, utility, and industrial clients. Their services include conducting energy audits, evaluating pump system efficiency, and offering construction inspection to help clients minimize energy consumption and reduce greenhouse gas emissions. JKMuir has worked on numerous projects, such as the NYC DEP Energy and Carbon Neutrality Plan and various pump system optimizations across New England. They are recognized for their expertise in integrating sustainability and clean energy into public infrastructure projects, ensuring that clients can achieve their emissions and energy assurance goals. JKMuir is also certified as a Women’s Business Enterprise (WBE) and Disadvantaged Business Enterprise (DBE) in multiple states, highlighting their commitment to diversity and inclusion in the engineering sector.

Energy Efficiency Insights: Key Companies in Connecticut

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