| A&M Insulations Ltd. | | UK-based thermal insulation engineers, specialists in cavity wall and loft insulation, fire protection, and cavity wall tie replacement. |
| Abbay Technical Services | | Provides California Title 24 energy code calculations and compliance services to the building industry. Find contacts, description of services, pricing and glossary. |
| Abraxas Energy Consulting | | Energy consulting and management services, software training, utility bill tracking, energy audits, and custom energy software applications. |
| ACC Environmental Consultants | | Specializing in asbestos testing, lead paint testing, mold testing, environmental site assessments, asbestos training and soil and groundwater testing in California. |
| Ace Laboratories, Inc. | | Consultants for the analysis of gas-phase compounds by GC or GC/MS. Providing reproductive means of quantitatively delivering VOC's from the point of sampling to a capillary GC column. |
| Acutel Consulting | | Electrical engineering and business consultancy firm specialising in providing services to the electricity industry, the telecommunications industry and government organisations. |
| Advanced Energy Systems | | Provides design and procurement for energy conservation, alternative energy and distributed generation needs. Residential and commercial energy audits. |
| Aegent Energy Advisors Inc. | | Provide objective advice and analysis to assist large energy users to reduce the cost, manage the risk, and resolve the complexity of their natural gas and electricity purchasing. |
| AeroMet Engineering, Inc. | | Environmental consulting and testing. Offers smoke school certification, contacts and mission statement. |
| Air Technology Ltd | | Independent measurement based consultancy specialising in compressed air, water, vacuum and other pressure systems. Problem solving and energy savings. |
| Altran Corporation | | Engineering, materials and management solutions for utilities and industry. Specializing in Flow Accelerated Corrosion (FAC), biofouling detection, boiler engineering and technical training services. |
| Ameresco | | Provide demand-side management, cogeneration facilities, renewable sources, procurement, and power plant development. Customers served, solutions, and results. |
| Ammonite Resources Company | | North American and international petroleum consultants specializing in geology, geophysics, engineering,technical and business due diligence, economic analyses, contract negotiations, expert witness testimony. |
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