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Mechanical and HVAC Services

“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


  • Air conditioning equipment assessments
  • Ventilation and building pressurization studies
  • ANSI/ASHRAE 62 ventilation compliance studies
  • NADCA ACR-2005 HVAC system assessments
  • Cooling and heating load calculations
  • Project management and supervision
  • Mechanical system commissioning
  • Determine effects of energy conservation measures on the HVAC system
  • Facility needs assessments



  • 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