McMillan James Equipment Company

McMillan James Equipment Company is a full-service HVAC manufacturers’ representative based in the Dallas/Fort Worth Metroplex. We specialize in creating custom Heating, Ventilation and Air Conditioning (HVAC) systems and engineered solutions in North Texas. Representing over 30 high-quality manufacturers, we offer an extensive range of products and solutions for diverse markets. Our experienced sales staff, in-house design capability, and full-service factory-certified technicians and installers allow us to exceed the expectations of our clients and their demanding applications.

We specialize in Variable Refrigerant Flow Systems.


McMillan James Equipment Company (MJEC) was founded in 1987 by its current president Mark McMillan. The company’s roots actually date back to the early 1950’s when McMillan Equipment Company (MECO), a Houston based manufacturer’s rep firm, was first established by Hugh D. McMillan Jr.McMillan and Associates was formed in 1987 when Mark McMillan took over the Dallas -Fort Worth operations of MECO. In 1999 the name was changed to McMillan Choate & Associates (MCA) when Lonnie Choate and Mark McMillan joined forces.

In 2007 Lonnie Choate sold his interest back to the company. The name was changed to McMillan James Equipment Company when Mark James and Robert McMillan purchased ownership positions and were elevated to the Partner level.

Since 2016, with continued growth, MJEC has added two more managing partners (Isaac Henson and Jeff Langlitz) and added offices in Houston, West Texas (Lubbock), and Central/South Texas (Austin) to provide exceptional service throughout the state.