American Mechanical Services (AMS) is one of the nation’s leading providers of commercial heating, ventilation, and air conditioning (HVAC) maintenance, repair, replacement, and new equipment installation, as well as plumbing and related services.

AMS began in 1997, when American Residential Services (ARS) purchased approximately 25 independent contractors and consolidated them to create a commercial HVAC arm. The newly acquired contractors were already well established companies with years of experience in the HVAC industry. This allowed AMS to quickly assimilate into each market. Accordingly, it was during this period that the AMS entities were acquired and reorganized into our current entity locations, which include:

  • Air Conditioning Associates, Inc. d.b.a. ACA – Denver Boiler
  • American Mechanical Services of Colorado Springs, L.L.C.
  • American Mechanical Services of Denver, L.L.C.
  • American Mechanical Services of Houston, L.L.C.
  • American Mechanical Services of Maryland, L.L.C.
  • American Mechanical Services of Texas, L.L.C.
  • AMS Mechanical Services, L.L.C. d.b.a. AMS Mechanical Services of Indianapolis, L.L.C.
  • Anderson Air Conditioning, L.P.
  • Southcoast Heating & Air Conditioning, L.P.
  • Tri-Pacific Heating & Air Conditioning, L.P.

In 1999, AMS was acquired by ServiceMaster. Each AMS company became a wholly-owned subsidiary under the ServiceMaster / AMS operating division rubric. During this period, Ed Dunn and Dave Schellhardt served as key officers of the ServiceMaster / AMS operating division and played significant roles in shaping the AMS brand as an industry leader.

In 2006, Dunn and Schellhardt formed a single-purpose parent company to acquire AMS from ServiceMaster. Thankfully, AMS has enjoyed its most successful years under the watch of Dunn and Schellhardt.

Collectively, AMS has an average of 30-plus years of industry experience. This kind of success and longevity can only be attributed to the quality and value of the work we provide to our customers.

In 2017, American Mechanical Services became a 100% employee owned (ESOP) construction company specializing in high-quality HVAC maintenance and services work on mechanical building systems and in complex construction and repair projects involving the renovation and retrofitting of older and occupied structures, both public and private.

In addition to competitive compensation and benefits, AMS offers an ESOP (Employee Stock Ownership Plan), which is a Company provided profit sharing retirement plan that lets you share in the results of the Company.

As owners, we have a stake in the future success of the company. Employees feel more of a connection to our business. We believe in a culture of trust and mutual respect and taking care of our employee-owners so they can focus on their best work and a balanced life.

We provide the highest levels of productivity with exceptional customer service taking pride in keeping customers for life.

TestimonialsView All

I would like to thank your company for doing an excellent job. Over the years I have worked on many projects with Tri-Pacific/AMS Heating and Air. It is with great pleasure that I would highly recommend them, and look forward …...
Director of Facilities
Southern California Real Estate Services would like to thank Tri-Pacific / AMS for making our lives a little easier by giving our tenants great quality service. The AMS staff is friendly, knowledgeable, and great to work with. Their prompt service …...
Assistant Property Manager
Southern California Real Estate Services
A special thanks and outstanding service recognition went to two AMS employees who reported a missing lock box containing keys to a Littleton Bank location of Wells Fargo. “They exemplifiy the kind of vendor we want to partner with, one …...
Regional Maintenance Manager
Regional Environmental Coordinator
Wells Fargo

Ty Molliconi

Regional Property Manager
Wells Fargo
American Mechanical Services and Holden MSS began its relationship during a bid process for corrective work in our Denver location. They spent long hours researching our issues and came to the table with honest, well-supported solutions. Through this process a …...
Facilities Manager
Holden MSS - Marketing Support Services
ACA Denver Boiler delivers outstanding value and customer service but most important is ACA’s commitment to keep your systems in peak operating condition at all times. They have impressed everyone with their flexibility and willingness to conquer every situation that’s …...
Senior Property Manager
Newmark Knight Frank Frederick Ross
I just wanted to take a moment to thank everyone at AMS for your continued support, and service to the operations here at FedEx Field. It is always such a pleasant experience to call on AMS. From the initial greeting …...
Lead Engineer at FedEx Field
Home of the Washington Redskins
AMS Mechanical Services has been our HVAC service and installation provider for the past 13 years. They also provide the industrial piping installation for our plant. We have found their expertise and response to be excellent.
Facilities Manager
Indiana Automotive Fasteners
Right from the start, in August of 2007, American Mechanical Services impressed us with their efficient, professional manner – an approach that not only inspired confidence – but also generated the results we were looking for. We found that the …...
SJLL Enterprises, LLC
AMS has been providing HVAC services to me for more than 15 years. Originally with another company and for the past 7 years here at Solex Contracting. Their service and quality has always been top notch. Whether doing a complex …...
Solex Contracting Inc
We have used American Mechanical Services as our exclusive HVAC contractor for over 6 years. They have proven time after time that they will do whatever it takes to solve our problem. It has never taken them more than 1 …...
Chief Engineer
BET Networks