DEI is a professional engineering firm based in Vienna, VA, specializing in building performance verification since 1991. With expertise in Building Commissioning, Retro-Commissioning, Re-Commissioning, and Energy Use Assessment, their professional engineers bring extensive experience and a diverse background to every project they undertake.
Over the past 26 years, DEI has successfully completed numerous commissioning and energy projects both nationally and internationally, earning a reputation for quality and a proven understanding of building technical issues. They take pride in their ability to communicate concisely, accurately, and effectively with their clients, delivering consistent, high-quality, on-time, and within-cost performance.
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