The energy efficiency industry in Ohio focuses on reducing energy consumption and implementing sustainable practices. Companies offer various solutions, including energy audits, automation technologies, and HVAC systems. As the demand for increased sustainability grows, these firms are increasingly working on innovative projects that target operational costs and energy savings. The industry is witnessing advancements in smart technologies, which help enhance energy management. Additionally, supportive state policies and changing consumer preferences are driving the growth of this sector. This evolution is pivotal in addressing climate change while simultaneously improving energy performance across commercial and residential buildings.


This list highlights 24 energy efficiency companies based in Ohio, varying in size from small firms to sizable organizations. Many were founded in the early 2000s and focus on specialized services ranging from HVAC solutions to energy consulting. Operating primarily from cities like Dayton, Cleveland, and Cincinnati, these companies play vital roles in enhancing energy efficiency. With a mix of family-owned businesses and corporate entities, they represent a significant portion of the state’s commitment to sustainable solutions.


Continue reading to discover the top energy efficiency companies in Ohio.


Top 24 Energy Efficiency Companies in Ohio


1. Energy Optimizers, USA

  • Website: energyoptusa.com
  • Ownership type: Family Owned
  • Headquarters: Dayton, Ohio, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 2009
  • Headcount: 11-50
  • LinkedIn: energy-optimizers-usa

Energy Optimizers, USA, based in Dayton, Ohio, is a family-owned company that specializes in energy efficiency solutions. Founded in 2009, the firm has carved out a niche in providing comprehensive energy-saving services to educational institutions, local governments, and commercial clients. Their offerings include energy audits, LED lighting retrofits, HVAC renovations, and renewable energy projects. The company emphasizes a vendor-neutral approach, ensuring that clients receive the best possible solutions tailored to their specific needs. With a strong focus on reducing operational costs and improving energy efficiency, Energy Optimizers, USA has successfully implemented numerous projects, contributing to significant energy savings and environmental benefits. Their commitment to ethics and customer service is evident in their long-standing relationships with clients, many of whom have engaged them for multiple projects over the years.


2. Plug Smart

  • Website: plugsmart.com
  • Ownership type: Corporate
  • Headquarters: Worthington, Ohio, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Latest funding: December 2021
  • Founded year: 2008
  • Headcount: 1001-5000
  • LinkedIn: plug-smart

Plug Smart, based in Worthington, Ohio, is an energy services company that specializes in energy efficiency and renewable energy solutions. Founded in 2008, the company has built a reputation for its customer-focused approach, delivering a range of services that include energy projects, building automation, and emergency services. Plug Smart serves various sectors, such as education, healthcare, and government, aiming to reduce energy costs and enhance facility performance. In December 2021, Plug Smart was acquired by Ameresco, a recognized player in the energy services market. This acquisition allows Plug Smart to leverage Ameresco's extensive resources and expertise, further expanding its capabilities in smart building solutions and energy efficiency projects. The company has been recognized for its growth, having been listed among Inc. Magazine's "500 Fastest" growing privately owned companies for three consecutive years. Plug Smart's commitment to creating budget-neutral capital improvement projects and its focus on transparent pricing and ROI have established it as a significant player in the energy efficiency sector.


3. World Energy Innovations, LLC


World Energy Innovations, LLC, based in Fremont, Ohio, is a consulting firm that specializes in energy efficiency solutions. Established in 1979, the company has built a reputation for helping businesses reduce energy costs and minimize their carbon footprints. Their services include comprehensive energy assessments, system design and build, and ongoing monitoring and verification. They have developed innovative technologies such as waste heat recovery systems and advanced lighting solutions, which are designed to optimize energy use across various sectors, including automotive, healthcare, and manufacturing. World Energy Innovations has collaborated with major corporations like Ford Motor Company and General Motors, showcasing their ability to implement large-scale energy efficiency projects. Their approach emphasizes accountability and performance guarantees, ensuring that clients achieve their sustainability goals while maintaining operational efficiency.


4. The Brewer-Garrett Company

  • Website: brewer-garrett.com
  • Ownership type: Private
  • Headquarters: Middleburg Heights, Ohio, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1959
  • Headcount: 201-500
  • LinkedIn: the-brewer-garrett-company

The Brewer-Garrett Company, headquartered in Middleburg Heights, Ohio, is a private service company specializing in energy solutions and facility management. With a workforce of approximately 156 employees, the company has been operational since 1959. Brewer-Garrett provides a comprehensive suite of services, including HVAC, energy services, design-build solutions, and integrated facility services. They cater to various sectors, including higher education, K-12 education, healthcare, and local government, focusing on enhancing operational efficiency and reducing costs for their clients. The company is dedicated to sustainability, actively working to improve energy efficiency and reduce greenhouse gas emissions through innovative solutions. Their approach includes energy audits, building automation systems, and performance contracting, which help clients achieve significant energy savings. Brewer-Garrett's commitment to customer satisfaction and environmental stewardship is evident in their long-standing relationships with clients and their proactive initiatives in energy conservation.


5. Building Integrated Services

  • Website: bisedge.com
  • Ownership type: Private
  • Headquarters: Oakwood, Ohio, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 2016
  • Headcount: 51-200
  • LinkedIn: building-integrated-services

Building Integrated Services (BiS), founded in 2016 and based in Oakwood, Ohio, is a private company that specializes in integrated engineering, mechanical, electrical, and facility services. With a workforce of around 31 employees, BiS caters primarily to major industrial and commercial facilities. The company is dedicated to enhancing operational performance and sustainability through its tailored solutions. BiS offers a comprehensive range of services, including energy audits, facility management, and building automation systems, all aimed at maximizing energy efficiency. Their team consists of licensed professionals in various engineering disciplines, ensuring that they provide high-quality, effective solutions. BiS is committed to helping clients achieve their energy sustainability goals, making them a relevant player in the energy efficiency sector.


6. TPI Efficiency

  • Website: tpiefficiency.com
  • Ownership type: Corporate
  • Headquarters: Cleveland, Ohio, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Latest funding: November 2022
  • Founded year: 2009
  • Headcount: 11-50
  • LinkedIn: tpi-efficiency

TPI Efficiency, based in Cleveland, Ohio, is a consulting company founded in 2009 that specializes in energy management and sustainability solutions. With a team of around 60 employees, TPI Efficiency offers a range of services aimed at helping businesses and organizations optimize their energy consumption and reduce costs. Their offerings include electricity and natural gas procurement, energy efficiency consulting, and renewable energy strategies. TPI Efficiency has worked with clients across various sectors, providing tailored solutions that address unique energy needs. They also focus on sustainability initiatives, assisting clients in achieving their environmental goals through comprehensive planning and execution. Their commitment to client success is evident in their numerous case studies showcasing significant savings and efficiency improvements for a variety of organizations, from airports to manufacturing facilities.


7. MegaLight Inc.

  • Website: megalight.com
  • Ownership type: Private
  • Headquarters: Hudson, Ohio, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1999
  • Headcount: 11-50
  • LinkedIn: megalight-inc.

MegaLight Inc., based in Hudson, Ohio, has been a key player in the energy efficiency sector since its founding in 1999. The company specializes in providing a variety of energy-saving products, including air purifiers, electric vehicle chargers, and smart home devices. MegaLight's mission is to help homeowners and organizations reduce energy consumption and lower utility costs. They actively partner with utilities and program implementers to deliver energy conservation solutions across the United States. The company also engages with non-profit organizations to target communities facing energy insecurity, distributing energy-saving kits and products to those in need. Through their community-focused initiatives and product offerings, MegaLight aims to make energy efficiency accessible to everyone.


8. Perfection Group

  • Website: perfectiongroup.com
  • Ownership type: Family Owned
  • Headquarters: Cincinnati, Ohio, United States (USA)
  • Employee distribution: United States (USA) 97%, Other 3%
  • Founded year: 1951
  • Headcount: 201-500
  • LinkedIn: perfection-group

Perfection Group, based in Cincinnati, Ohio, is a family-owned facility management company founded in 1951. With a workforce of approximately 255 employees, they specialize in a range of services including HVAC maintenance, green solutions, design-build, and total facility management. The company serves various sectors such as commercial, government, education, industrial, healthcare, and community. Their focus on energy efficiency is a core aspect of their operations, as they aim to reduce energy consumption and operational costs for their clients. Perfection Group manages over 115 million square feet across 1,800 facilities nationwide, ensuring improved air quality and energy savings for over 460,000 individuals. Their green solutions team is equipped with industry experts who conduct energy audits and recommend energy conservation measures, further solidifying their role in promoting sustainability within the facilities they manage.


9. USIlluminations

  • Website: usilluminations.com
  • Ownership type: Private
  • Headquarters: Akron, Ohio, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 2011
  • Headcount: 11-50
  • LinkedIn: usilluminations

USIlluminations, based in Akron, Ohio, is a private service company founded in 2011. With a team of 22 employees, the company specializes in energy efficiency and lighting solutions tailored for commercial and industrial clients. Their offerings include project management, electric vehicle charging installations, maintenance programs, lighting audits, and smart building controls. USIlluminations is dedicated to helping businesses reduce energy costs and enhance operational efficiency through innovative and sustainable practices. They have successfully completed projects across all 50 states, demonstrating their capability to manage large-scale national programs. As a woman-owned business, they emphasize customer satisfaction and strive to provide tailored solutions that meet specific client needs. Their approach includes comprehensive site analysis and energy audits, ensuring that clients receive the best possible energy-efficient options and support throughout the project lifecycle.


10. Magnum Innovations


Magnum Innovations, also known as Magnum First, is a private company based in Hudson, Ohio, founded in 2018. With a team of 11 to 50 employees, the company focuses on providing building management solutions that prioritize energy efficiency and automation. Their product range includes advanced HVAC control systems, smart lighting solutions, and water conservation technologies. Magnum First primarily serves commercial, industrial, educational, and government sectors, aiming to improve operational efficiency and reduce energy costs through innovative wireless technologies. The company has successfully deployed hundreds of thousands of devices across various projects, resulting in substantial energy savings for their clients. Their approach emphasizes custom solutions, scalability, and minimal maintenance, which positions them as a relevant player in the energy efficiency industry.


11. Lexi

  • Website: lexi.tech
  • Ownership type: Private
  • Headquarters: Lebanon, Ohio, United States (USA)
  • Employee distribution: India 50%, United States (USA) 42%, Ukraine 8%
  • Founded year: 2017
  • Headcount: 11-50
  • LinkedIn: lexidevices

Lexi, founded in 2017 and based in Lebanon, Ohio, is a private technology firm that specializes in Internet of Things (IoT) solutions for energy management and building automation. With a workforce of around 40 employees, Lexi has developed innovative products like SmartBMS and SmartENTERPRISE, which are tailored to assist businesses in optimizing their energy consumption and adhering to stringent climate regulations. The company primarily serves real estate and facilities managers who are looking to retrofit existing buildings to enhance energy efficiency. Lexi's technology integrates AI and machine learning to provide automated energy management, enabling significant reductions in energy usage. Their solutions are particularly relevant in the context of increasing climate mandates, making them a key player in the energy efficiency industry.


12. Heapy

  • Website: heapy.com
  • Ownership type: Private
  • Headquarters: Dayton, Ohio, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1945
  • Headcount: 201-500
  • LinkedIn: heapy

Heapy is a consulting engineering firm based in Dayton, Ohio, founded in 1945. With a workforce of approximately 266 employees, the company specializes in MEP engineering, building optimization, and sustainability services. Heapy's approach is collaborative, ensuring that projects not only meet client expectations but also adhere to regulatory standards. They provide a range of services, including energy audits, retro-commissioning, and utility program administration, aimed at improving building performance and achieving energy efficiency. Heapy has successfully completed over 1,000 projects in 2023 alone, demonstrating their active involvement in the energy efficiency sector. Their client base spans multiple industries, including aviation, healthcare, education, and public utilities, reflecting their broad expertise and commitment to enhancing energy performance across various types of facilities.


13. Bard Manufacturing Company, Inc.

  • Website: bardhvac.com
  • Ownership type: Family Owned
  • Headquarters: Bryan, Ohio, United States (USA)
  • Employee distribution: United States (USA) 92%, Mexico 8%
  • Founded year: 1914
  • Headcount: 501-1000
  • LinkedIn: bard-manufacturing-company-inc-

Bard Manufacturing Company, Inc., based in Bryan, Ohio, has been a family-owned business since its founding in 1914. The company specializes in manufacturing HVAC solutions, offering a wide range of products including air conditioners, heat pumps, and geothermal systems. Bard serves a variety of markets, such as schools, telecom companies, and industrial sectors, providing essential equipment to maintain optimal environmental conditions. Their focus on energy-efficient heating and cooling solutions is evident in their product offerings, which include advanced technologies designed to reduce energy consumption and improve performance. Bard's commitment to quality and customer relationships has established them as a reliable player in the HVAC industry, with a significant presence in the United States and Mexico.


14. Green Building Consulting

  • Website: greenbldgconsulting.com
  • Ownership type: Private
  • Headquarters: Cincinnati, Ohio, United States (USA)
  • Employee distribution: United States (USA) 81%, Egypt 19%
  • Founded year: 2006
  • Headcount: 11-50
  • LinkedIn: green-bldg-consulting

Green Building Consulting, based in Cincinnati, Ohio, is a consulting firm dedicated to advancing green building practices and energy efficiency. Founded in 2006, the company has built a reputation as a trusted source for energy modeling, testing, certifications, and educational resources. They serve a variety of clients, including builders, developers, and architects, helping them enhance the sustainability of their projects and comply with environmental standards. The firm has also established the Green Building University, which offers educational sessions on green building practices, further demonstrating their commitment to industry knowledge and training. Their services cover a wide range of green building programs, including LEED, ENERGY STAR, and Passive House, among others. With a team of accredited professionals, Green Building Consulting provides technical assistance throughout all phases of a project, from conceptual design to final certification, ensuring that energy efficiency is prioritized in building practices.


15. CSL Technology Solutions

  • Website: csl-tech.com
  • Ownership type: Private
  • Headquarters: Tipp City, Ohio, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1977
  • Headcount: 11-50
  • LinkedIn: leveck-lighting-products-inc.

CSL Technology Solutions, based in Tipp City, Ohio, has been operational since 1977. The company specializes in lighting and technology solutions tailored for various sectors, including commercial, healthcare, and education. Their offerings include energy audits, smart building solutions, and electric vehicle charging installations, all aimed at enhancing energy efficiency and operational effectiveness. CSL Technology Solutions prides itself on being a full-service provider, managing projects from initial design through to implementation and maintenance. Their expertise in energy analysis and utility incentive management further supports their role in helping clients reduce energy costs and improve sustainability. With a dedicated team of professionals, CSL Technology Solutions is committed to delivering tailored solutions that meet the specific needs of their clients, ensuring that energy efficiency remains at the forefront of their operations.


16. Go Sustainable Energy, LLC


Go Sustainable Energy, LLC, based in Worthington, Ohio, is an energy consulting firm that has been operational since 2006. The company specializes in sustainable energy and energy efficiency, providing clients with unbiased information and technical support to improve their energy management practices. Their service offerings include energy audits, commissioning, energy simulation, and measurement & verification, which are essential for identifying and implementing energy savings opportunities. Go Sustainable Energy has worked with a variety of clients, including educational institutions, municipal utilities, and commercial entities, helping them achieve their sustainability goals. The firm prides itself on being a technical strategist for its clients, ensuring that their recommendations are tailored to meet specific energy needs. With a team of well-credentialed engineers, the company is dedicated to advancing energy efficiency practices across various sectors.


17. Eco Engineering, Inc.


Eco Engineering, Inc., based in Cincinnati, Ohio, is a private company founded in 1993. With a workforce of approximately 82 employees, the firm specializes in commercial electrical contracting. Their services range from electrical construction and maintenance to advanced lighting solutions and smart building systems. Eco Engineering plays a significant role in the energy efficiency sector by implementing energy-saving programs and technologies. They cater to a variety of industries, including healthcare, education, and retail, helping organizations optimize their facilities for better energy performance. Their projects often involve retrofitting existing systems to improve energy efficiency, thereby reducing costs and enhancing sustainability for their clients.


18. Echogen Power Systems

  • Website: echogen.com
  • Ownership type: Venture Capital
  • Headquarters: Akron, Ohio, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Latest funding: Other (Grant), $1.0M, July 2017
  • Founded year: 2007
  • Headcount: 11-50
  • LinkedIn: echogen-power-systems

Echogen Power Systems, based in Akron, Ohio, is an energy solutions provider that focuses on waste heat recovery and energy storage technologies. Founded in 2007, the company has developed products like the EPS100 heat engine, which is designed to help businesses in sectors such as manufacturing and oil & gas improve their energy efficiency and reduce operational costs. Echogen's technology allows clients to harness unused energy effectively, contributing to more sustainable practices. The company has also been involved in projects supported by the U.S. Department of Energy, receiving a $1 million grant to develop a solar thermal energy storage and power system. This involvement highlights their commitment to advancing energy efficiency solutions in various applications, including industrial heat, power generation, and renewable energy.


19. Novar

  • Website: novar.com
  • Ownership type: Corporate
  • Headquarters: Cleveland, Ohio, United States (USA)
  • Employee distribution: United States (USA) 67%, Germany 33%
  • Latest funding: $2.3B, December 2004
  • Founded year: 1964
  • Headcount: 201-500
  • LinkedIn: novar

Novar, a subsidiary of Honeywell International Inc., is based in Cleveland, Ohio, and has been operational since 1964. The company specializes in building automation, providing a range of solutions that include energy management, installation services, and connectivity services. Novar's offerings are particularly valuable to sectors such as healthcare and education, where operational efficiency and safety are paramount. Their energy management systems are designed to help organizations monitor and control their energy usage effectively, contributing to sustainability goals and cost savings. With a workforce of around 159 employees, Novar is actively engaged in enhancing the performance of buildings through advanced automation technologies.


20. Aeroseal

  • Website: aeroseal.com
  • Ownership type: Venture Capital
  • Headquarters: Miamisburg, Ohio, United States (USA)
  • Employee distribution: United States (USA) 97%, Other 3%
  • Latest funding: Series B, $67.0M, July 2023
  • Founded year: 2010
  • Headcount: 201-500
  • LinkedIn: aeroseal-llc

Aeroseal, founded in 2010 and based in Miamisburg, Ohio, focuses on air sealing technology for buildings. The company offers innovative solutions aimed at improving energy efficiency and indoor air quality through its AeroBarrier and duct sealing technologies. Aeroseal serves a variety of customers, including homeowners, builders, and contractors, all seeking to enhance building performance and lower energy expenses. The company has sealed over 300,000 structures globally, which includes homes, hospitals, schools, and commercial buildings. Aeroseal's technology has garnered significant recognition, including awards from the U.S. Department of Energy and various industry accolades. Recently, they secured $67 million in Series B funding, indicating strong investor confidence in their mission to combat climate change by reducing building emissions.


21. ThermalTech Engineering

  • Website: thermaltech.com
  • Ownership type: Private
  • Headquarters: Cincinnati, Ohio, United States (USA)
  • Employee distribution: United States (USA) 99%, Other 1%
  • Founded year: 1980
  • Headcount: 51-200
  • LinkedIn: thermaltech-engineering_2

ThermalTech Engineering, founded in 1980 and based in Cincinnati, Ohio, is a private engineering consulting and construction services firm. With a workforce of approximately 186 employees, the company specializes in mechanical, electrical, plumbing, process, and controls engineering, as well as energy management. ThermalTech serves clients across multiple sectors, including industrial, healthcare, food and beverage, and government, providing customized solutions to improve facility operations and ensure compliance with industry standards. The firm operates through a network of offices in several states, enhancing its ability to deliver innovative engineering solutions. Notably, ThermalTech has a strong emphasis on energy conservation and sustainability, offering services such as energy assessments and support for Energy Star and LEED certifications. Their team includes over 30 Professional Engineers and several Certified Energy Managers, underscoring their expertise in the field. The company has completed thousands of projects, demonstrating a solid track record in engineering excellence and sustainable practices.


22. Rudolph Libbe Inc.

  • Website: rudolphlibbe.com
  • Ownership type: Private
  • Headquarters: Walbridge, Ohio, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1955
  • Headcount: 201-500
  • LinkedIn: rudolph-libbe

Rudolph Libbe Inc., founded in 1955 and based in Walbridge, Ohio, is a private construction and facility management firm. With a workforce of approximately 207 employees, the company specializes in a range of services that include construction, facility maintenance, and energy solutions. They cater to various businesses and organizations, focusing on optimizing facilities to enhance operational efficiency and reduce costs. A significant aspect of their operations is the emphasis on energy efficiency, where they assist clients in building energy platforms that not only save money but also create resilience against operational risks. Their approach integrates funding, design/build, and ongoing maintenance, showcasing their comprehensive understanding of energy management. Additionally, their GEM Energy division further underscores their commitment to energy solutions, providing tailored services that help clients achieve their energy efficiency goals.


23. ICS Inspectors, LLC

  • Website: ics-inspectors.com
  • Ownership type: Private
  • Headquarters: Beachwood, Ohio, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 2020
  • Headcount: 11-50
  • LinkedIn: ics-inspectors

ICS Inspectors, LLC, founded in 2020 and based in Beachwood, Ohio, is a consulting firm dedicated to energy efficiency and building compliance. The company provides a range of services including Home Energy Rating System (HERS) ratings, ENERGY STAR certifications, and energy inspections. Their expertise is particularly valuable for homebuilders and developers, helping them meet local energy codes and improve building performance. ICS Inspectors is recognized as a RESNET Accredited Rating Provider and an ENERGY STAR program partner, which underscores their commitment to energy efficiency standards. They also participate in initiatives like the Zero Energy Ready Home Program and offer guidance on energy rebate programs. With a team of certified professionals, ICS Inspectors aims to deliver thorough and efficient inspections, ensuring that their clients can achieve compliance and enhance sustainability in their projects.


24. Four Seasons Environmental, Inc.

  • Website: fseinc.net
  • Ownership type: Private
  • Headquarters: Monroe, Ohio, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1985
  • Headcount: 201-500
  • LinkedIn: four-seasons-environmental-inc.

Four Seasons Environmental, Inc. is a facility management company based in Monroe, Ohio, founded in 1985. With a workforce of approximately 140 employees, the company focuses on energy savings, commissioning, and maintenance services. They cater to a variety of clients, including educational institutions and government agencies, providing tailored solutions to enhance operational efficiency and occupant comfort. Over the years, Four Seasons has managed more than 12 million square feet of facility space across the United States. Their expertise includes operational improvements, targeted equipment upgrades, and retro-commissioning, all aimed at optimizing energy use and reducing costs. The company is recognized as one of only 110 firms listed on the Department of Energy’s Qualified List of Energy Service Companies, underscoring their credibility in the energy efficiency sector. Their commitment to energy management has resulted in over $20 million in avoided energy costs since 1994, showcasing their long-standing impact in the industry.



Energy Efficiency Insights: Key Companies in Ohio


CompanyHeadquarterSizeFoundedOwnership
Energy Optimizers, USADayton, Ohio, United States (USA)11-502009Family Owned
Plug SmartWorthington, Ohio, United States (USA)1001-50002008Corporate
World Energy Innovations, LLCFremont, Ohio, United States (USA)11-501979Private
The Brewer-Garrett CompanyMiddleburg Heights, Ohio, United States (USA)201-5001959Private
Building Integrated ServicesOakwood, Ohio, United States (USA)51-2002016Private
TPI EfficiencyCleveland, Ohio, United States (USA)11-502009Corporate
MegaLight Inc.Hudson, Ohio, United States (USA)11-501999Private
Perfection GroupCincinnati, Ohio, United States (USA)201-5001951Family Owned
USIlluminationsAkron, Ohio, United States (USA)11-502011Private
Magnum InnovationsHudson, Ohio, United States (USA)11-502018Private
LexiLebanon, Ohio, United States (USA)11-502017Private
HeapyDayton, Ohio, United States (USA)201-5001945Private
Bard Manufacturing Company, Inc.Bryan, Ohio, United States (USA)501-10001914Family Owned
Green Building ConsultingCincinnati, Ohio, United States (USA)11-502006Private
CSL Technology SolutionsTipp City, Ohio, United States (USA)11-501977Private
Go Sustainable Energy, LLCWorthington, Ohio, United States (USA)11-502006Private
Eco Engineering, Inc.Cincinnati, Ohio, United States (USA)51-2001993Private
Echogen Power SystemsAkron, Ohio, United States (USA)11-502007Venture Capital
NovarCleveland, Ohio, United States (USA)201-5001964Corporate
AerosealMiamisburg, Ohio, United States (USA)201-5002010Venture Capital
ThermalTech EngineeringCincinnati, Ohio, United States (USA)51-2001980Private
Rudolph Libbe Inc.Walbridge, Ohio, United States (USA)201-5001955Private
ICS Inspectors, LLCBeachwood, Ohio, United States (USA)11-502020Private
Four Seasons Environmental, Inc.Monroe, Ohio, United States (USA)201-5001985Private


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