Passionate Pursuit of Perfection


Commercial and Residential Consulting Excellence

PEG, LLC is in its 25th year as a diverse energy efficiency, engineering, environmental, and management consulting firm operating principally in the Eastern and Central United States. PEG specializes in building energy performance, green building program compliance, building diagnostics, environmental and code compliance, thermal performance, HVAC design and operation, and construction defect. These capabilities have enabled PEG to become a leader in the application of national green building standards and demand side energy efficiency protocols. Operating as a design consultant and “boots on the ground” interim and continuous inspection agent, PEG leads the way in verification of effective planning and real-world application of all aspects of sustainable construction. PEG performs at every level of contracting from commercial structures to residential dwellings to charitable endeavors.

PEG promotes a company culture that understands the importance of a “team first” mentality. Team collaboration can only be successful by encouraging open communication through transparency, ensuring a positive and safe work environment, promoting a work/life balance, and recognizing the need for professional development at all levels of the organization. Passion, motivation, diversity, and drive are nurtured through the understanding of just how much of an impact each and every PEG team member makes to contribute to the sustainability of the communities that we work in all over the United States.

PEG began in 1998 as Patuxent Environmental Group, Inc with Matthew Cooper as President. The firm was formed as Mr. Cooper saw a unique utilization opportunity for the mechanical engineering and environmental skills he had honed while working for the Trane corporation and subsequent GSA property management and building diagnostic firms.

Early in the Patuxent years, PEG operated in the indoor air quality and building performance realm of consulting with an emphasis on federal GSA properties, military institutions and major commercial and institutional client sites. This engagement in complex building failure projects quickly garnered the attention of law practices involved in litigating built-environment cases involving hotels, hospitals, multi-family buildings, single family communities and many others. A pragmatic approach to solving complicated built environment failures was the calling card of PEG; along with a willingness to take on formidable challenges where other consultant firms hesitate to engage.

In 2005, JoAnn Spence joined the firm following more than ten years of working in the production homebuilding industry where she advanced through nearly every aspect of operations with Centex Homes. Ultimately landing in the C-Suite, she had experienced and mastered roles in finance, construction, warranty and customer satisfaction along her tenured path. Her experience with a Fortune 500 construction firm brought a new level of professionalism, customer service and growth opportunity to PEG.

In 2014 the firm was succeeded by PEG, LLC. with Ms. Spence acquiring majority ownership and becoming President & CEO. Mr. Cooper assumed the role of minority owner in the positions of Senior Vice-President & COO.


PEG is a part of your team.

As a leading provider of state-of-the-art Commercial, Residential, Multi-family and Mixed-use MEP Design services, PEG endeavors to meet all our customer expectations at the highest level. We collaborate fully as a team member with our industry clients and see every project from inception to completion as a partner.

Communicating your vision.

We strive to make efficient, cost effective design decisions and believe in the concept of mutually beneficial relationships with our clients. Our goal is to become a long-term business asset with every client.

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21st century HVAC Design.

As the national leader in HVAC Design, PEG brings decades of experience to your HVAC Design projects. Working in all climate zones and licensed Engineers in all 50 U.S. States, PEG is a leader in modern HVAC Design for the Modern Built Environment.

HVAC designed for you.

We offer direct Senior Management involvement in all our designs programs. Senior Management involvement in design ensures that our clients directly benefit from our years of experience and knowledge of what works and what does not work. Cost effective design begins with the application of decades of lessons learned, with a key focus on reduced warranty issues, customer comfort complaints and cost avings for our clients. All PEG HVAC Designs are performed using the ACCA and ASHRAE industry Standards.

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Changing the industry.

As the national leader of the energy efficiency arena, PEG has decades of experience and knowledge to drive your project’s energy efficiency needs. With our comprehensive suite of innovative packages, PEG can supply you with the depth of knowledge and support your organization needs.

Options designed for you.

PEG offers all available energy efficiency solutions, enabling us to find the one that will best suit your companies’ goals for the energy efficient modern built environment. Whether you seek code compliance consultation and testing, RESNET HERS Program solutions and execution or ENERGY STAR certification, PEG

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Focusing on perfection.

As a leader in the Green Building Program industry, PEG can provide your Green Building project expert consultation and evaluation from inception to field execution and certification. As a national participant in all major Green Building programs across the United States, PEG has a depth and breadth of experience like no other company in our industry.

We are the right choice for you.

PEG’s award winning Green Building Department has decades of experience in all facets of Green building and sustainability programs. Our unique, consultative approach offers a turn-key experience for our clients to meet their green building objectives in a timely, efficient manner.

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Providing you the tools to succeed.

PEG provides Built Environment Inspection services for Commercial, Institutional and Residential communities and buildings. Built environment professionals rely on PEG to protect their valuable investments and solve problems at all phases of the construction process.

Be proactive and adaptive.

PEG is an expert in the evaluation and inspection of modern building techniques and common problems faced by the construction professional today. Innovative programs and methods provide our clients with effective and comprehensive solutions.

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