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“Helping our client design, build operate and maintain high performance green buildings"

Our mission is to provide honest, discrete and professional service to clients who share our concern for the comfort, health, safety and well being of building occupants while maximizing the buildings efficient use of the natural resources needed for its successful operation.

D. C. Herrmann & Associates


Donald C. Herrmann founded D. C. Herrmann & Associates in 1996. Realizing the growing demand for skilled professionals with energy and building related problem-solving capabilities, a group of associates were brought together. Through a unique combination of academic achievement and hands-on experience, our dedicated professionals work with clients to assess their concerns, offer alternative solutions and assist them in making intelligent decisions to improve their buildings carbon footprint and the overall indoor environment.

Realizing that all buildings are different, we provide a customized approach that looks at the building as an entire system comprised of smaller sub-systems that must work in harmony to be successful. This includes the building, its surroundings, present or intended use and the interoperability of all components and sub-systems. By addressing a project in its totality, clients achieve a long-term solution with the least amount of lost time and revenue. Our seasoned professionals provide an understanding of Florida’s distinctive environment that can only be realized by local knowledge and proven experience.


  • Indoor Environmental Services Our Council-Certified Indoor Environmental Consultants and Certified Indoor Air Quality Professionals offer unique solutions to Indoor Environmental Quality (IEQ) concerns.  Our expertise in building science identifies problems and recommends solutions.
  • Mechanical and HVAC ServicesWe have over 30 years proven experience in solving problems with HVAC systems and their interactions with the built environment.  Understanding the interoperability of the various building systems is vital to the successful operation of today’s high performance buildings.
  • Energy & Sustainability ServicesOur unique combination of academic training and hands-on experience brings a practical perspective to maximizing building efficiency while reducing operation and maintenance costs, improving the buildings indoor environment and minimizing the use of our natural resources.
  • Litigation SupportExpert testimony and support documentation is available in the areas of building science, water intrusion, indoor environmental quality, Mechanical and HVAC systems, energy and building sustainability.
Just a quick note to thank you for all your effort and sound advice. I am so pleased I used D. C. Herrmann & Associates, it is good to see there are still traditional tradesman about!

Ian Griffin - Tampa, FL

The best investment we made was replacing our old and leaking windows with the UPVC design Don recommended. They complement the house wonderfully and have reduces the noise considerably. It is also nice to have no draft on the cold windy mornings!

Gloria Bell- Tampa, FL