ASHRAE hires McLennan Design, Houser Walker Architecture, and Integral Group to design its world headquarters

The partnership of McLennan Design and Houser Walker Architecture, in collaboration with international engineering firm Integral Group, has been selected to lead the design of a new world headquarters for the American Society of Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE), based in Atlanta, Georgia. The design team is tasked with renovating a 69,000-square-foot 1970s office building to house ASHRAE’s employees and to net-zero energy performance levels. Jason McLennan, author of the Living Building Challenge and founder and CEO of McLennan Design, will lead architectural design for the project, with Houser Walker Architecture’s Greg Walker leading interior architecture and also serving as the architect of record.

“It is a great honor to have been selected for the ASHRAE headquarters project,” says McLennan. “Not only will the renovation serve as an important example of what’s possible in retrofitting for deep energy efficiency, it will also provide a healthy, biophilic, and productive work environment for ASHRAE’s employees and the wonderful volunteer committees that serve the industry.”

Founded in 1894, ASHRAE is a not-for-profit global society advancing human well-being through sustainable technology for the built environment. ASHRAE funds research projects, provides continuing education programs, and develops technical standards for the advancement of HVAC&R systems design and construction, with over 56,000 members worldwide.

“Our Society is displaying industry leadership through our world headquarters renovation project by transforming existing building stock to the highest levels of efficiency and lowest levels of environmental impact,” says ASHRAE President Sheila Hayter, P.E. “We’re thrilled to work with McLennan Design and Houser Walker Architecture as we take on this unique challenge, while helping others learn from our experience.”

“We’re eager to show that great design can be accomplished for the typical market pricing,” adds Greg Walker of Houser Walker Architecture. “The ability for ASHRAE to lead by example is one our entire team has embraced. This project will help drive deep green renovations in the Atlanta market for the next decade.”

McLennan Design is a regenerative architecture, planning, design, and product design practice focused on deep green sustainability, community, and education. MD was founded in 2013 as a new firm dedicated to the creation of Living Buildings, net-zero and regenerative projects. Founded by global sustainability leader and green design pioneer Jason McLennan, the firm brings institutional knowledge and expertise of the Living Building Challenge, and the host of related programs. Joined by partner Dale Duncan, AIA, McLennan Design works with many institutions, companies, and developers around the globe in reimagining and redesigning for positive environmental and social impact. Learn more at

Houser Walker Architecture is a boutique architecture studio dedicated to creating value, supporting clients’ missions through impactful design. Houser Walker Architecture gives shape to organizations, companies, and communities through an iterative, participatory, and collaborative process. The firm specialize in creative work environments, colleges and universities, arts and cultural spaces, and other spaces where creative communities and institutional innovation needs to be supported by great architecture and interior design. Houser Walker Architecture’s process creates long-term benefits to clients and the planet, primarily through reducing overall energy and resource consumption, creating long term adaptability and flexibility, and promoting self-sustainable ecologies. Learn more at

Integral Group is an interactive global network of mechanical, electrical, plumbing and energy engineers collaborating under a single deep green engineering umbrella. Integral Group provides a full range of building system design, sustainability consulting, and energy analysis services. With a staff of over 500 located in 16 offices across the United States, Canada, Australia, and Great Britain, Integral Group specializes in building system design. As a member of the U.S., Australia and Canada Green Building Councils, the firm has 90+ LEED Accredited Professionals with expertise that includes alternative energy sources, passive system design, and green building systems. Learn more at

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