Founded in 1991, DEI is a professional engineering firm specializing in Building Commissioning, Retro-Commissioning, and Energy Management services.

DEI is a professional consulting firm specializing in building commissioning, retro-commissioning, energy management, and facility assessments. We provide building owners and operators a high level of assurance that their installed systems are operating within the performance guidelines specified in the project construction documents and design intent. DEI's keen knowledge of today's high-tech building systems provides building owners with an unbiased perspective of their system installation, op...

DEI is a professional consulting firm specializing in building commissioning, retro-commissioning, energy management, and facility assessments. We provide building owners and operators a high level of assurance that their installed systems are operating within the performance guidelines specified in the project construction documents and design intent. DEI's keen knowledge of today's high-tech building systems provides building owners with an unbiased perspective of their system installation, operation, performance, and efficiency.