Executive Profiles

GENERAL MANAGERS

David Douglas
General Manager
American Mechanical Services of Houston, L.L.C.

Mr. Douglas has served as the GM in Houston since 1984, when he formed the predecessor entity known as Enterprise Mechanical Inc. He is responsible for the oversight and management of all aspects of the company’s operations. Mr. Douglas received his Mechanical Instructor Certification from Purdue University, serves as a Mechanical Instructor for Houston Community College and holds a Class “A” Mechanical Contractor’s license with the State of Texas. He served as the Chairman of the Texas Oversight Committee for Mechanical Contractors for 4 years representing mechanical contractors throughout Texas, in the contract negotiations with organized labor unions, and is a Director of the Ft. Bend Chamber of Commerce.

Mr. Douglas is an Army Veteran, and was honorably discharged in 1974. He has two daughters, a step-son, and four grandchildren that live in the greater Houston area. He is an active member of Lions International, Boy Scouts of America, Lighthouse Charity Team, Hemingway Look Alike Society, The Houston Livestock Show and Rodeo Bar-B-Que, CCA, and The NCRS (National Corvette Restoration Society). Mr. Douglas enjoys all outdoor activities, such as camping, boating, fishing, hunting, skiing, horseback riding, scuba diving, and sky diving. He also enjoys attending concerts, mostly country western of course.

Mitch Haynam
General Manager
Anderson Air Conditioning, L.P.

Mr. Haynam has served as the GM at Anderson since 2005. He has been with Anderson as its predecessor entity since 1980, starting his HVAC career at Anderson as an apprentice installer, then transitioning to a lead installer, then to sales and sales manager, and then to GM. Mr. Haynam has received Tech-1 certification and training from Carrier and studied HVAC at Mt. San Antonio College. He holds a C-20 license in California and Nevada, has expertise in sales, service, preventive maintenance, plan and spec construction and design-build work. He has been married for 28 years, with four children and one granddaughter. He enjoys riding dirt bikes, playing golf, serving at his church and spending time with family.

Chip Knight
General Manager
Tri-Pacific Heating & Conditioning, L.P.

Mr. Knight has served as the GM at Tri-Pacific for 10 years. He has been with AMS for 16 years and has worked in the HVAC industry for 31 years. He currently holds a C-20 Contractors License with the State of California. Mr. Knight has expertise in design-build work, large commercial applications and is capable of handling most any size commercial HVAC project. He enjoys spending time with his wife, playing golf, surfing and family time, especially with his 4 sons.

Mike Lepak
General Manager
Southcoast Heating & Air Conditioning, L.P.

Mr. Lepak has been the GM at Southcoast since 2011. He has been with AMS for 12 years, previously working at the Anderson location. Mr. Lepak has been in the HVAC industry for 15 years. He specializes in new construction (plan and spec), retrofit and construction, as well as replacements of chillers, cooling towers, boilers, roof top units as well as split systems. He also has extensive experience providing HVAC air conditioning for the telecom industry in the form of split systems and/or wall mount units in order to cool the equipment serving the cell tower, as well as handling residential needs including but not limited to replacing existing equipment and/or designing a new system for an existing or new custom home.

Gary Nuñez
General Manager
American Mechanical Services of Texas, L.L.C.

Mr. Nuñez was named GM of the Dallas office in October of 2013. He has been in the HVAC industry for more than 18 years, starting his tenure with AMS in Houston in 2000. He spent 13 years in sales and account management. While in Houston, he sold HVAC maintenance, equipment replacement and service/repair agreements. His primary focus was on hospitals and medical facilities throughout The Texas Medical Center. Mr. Nuñez sold light commercial HVAC equipment for 5 years prior to joining AMS. He received his Bachelor's of Business Administration with a Minor in Political Science from Stephen F. Austin State University in Nacogdoches, Texas. He is married and has two children.

Sheen Thomas
General Manager
American Mechanical Services of Colorado Springs, L.L.C.

Mr. Thomas was named GM of the Colorado Springs office in August of 2017. He has been with AMS since 2000 and has worked in the HVAC industry for more than 25 years. His career started as a helper/installer in Northern Michigan. After moving to Colorado in 1993 he continued with installation and completed 4 years as a sheet metal apprentice through Pikes Peak Community College. After completing his apprenticeship he then transitioned into a Journeyman Service Technician position advancing into commercial HVAC. While employed at AMS he has held positions from Journeyman Technician to Service Manager, then Project Manager and now General Manager. He has a diverse background in service, sales, preventative maintenance, retrofit and replacement, plan and spec construction and design build projects. His free time is spent thinking about snowmobiling, talking about snowmobiling, planning snowmobile trips, and actually snowmobiling.

Dave Schellhardt
General Manager
American Mechanical Services of Maryland, L.L.C.

Mr. Schellhardt has served as the General Manager in the Maryland office since 2003. In addition to his role as GM, he has served as the President of AMS since 2006. Prior to 2006, Mr. Schellhardt served as CFO of AMS for 10 years. Mr. Schellhardt has been in the HVAC industry for over 27 years. He worked at Boland Trane for 10 years and at EMD Mechanical prior to joining the AMS management team with Mr. Dunn in 1996. Mr. Schellhardt received his BS in Accounting and Business Administration from Delaware State University. He enjoys playing golf in his spare time and spending time with his family.

Jerry Sievers
General Manager
Air Conditioning Associates, Inc. dba Denver Boiler

Mr. Sievers has served as the GM at ACA Denver Boiler since 2007 and has been with AMS in its predecessor forms for over 32 years. He has been in the HVAC business for 34 years, starting as an apprentice and working his way from journeyman to field supervisor to service manager and now serving as the GM. Mr. Sievers successfully performed 4 years of apprenticeship training and 15 years of level 3 journeyman training and has received numerous HVAC certifications. He currently carries all state and local municipality licensing, along with the ICC international master mechanical license. Mr. Sievers’ expertise is in commercial HVAC systems and building evaluations, diagnosis, repair, solutions and bidding.

Ron Timmons
General Manager
American Mechanical Services of Denver, L.L.C.

Mr. Timmons has served as the Denver GM since 1998 but has worked at the Denver location since 1980. He has been in the industry since 1969. He worked as a technician from 1969 to 1979 and started the predecessor business entity in 1980. Mr. Timmons’ experience varies from general HVAC service to working on large central plants, chillers, boilers, and controls. He enjoys working directly with customers and genuinely enjoys working in the HVAC industry. Mr. Timmons has received several training certifications and awards from Carrier, Trane, Honeywell, and other major manufacturers, as well as National and Local Contractors Associations, such as ACCA, RACCA, and SMACNA.

Luann Vazquez
General Manager
AMS Mechanical Services of Indianapolis, L.L.C.

Ms. Vazquez has served as General Manager since September 2014. She has been with AMS Mechanical and it’s predecessor entities since 1985. She also worked at Honeywell before joining AMS. She enjoys sports, cooking & travelling.

CORPORATE

Ed Dunn
Chief Executive Officer

Mr. Dunn has served as the CEO of AMS since 2006. Prior to 2006, he served as President of AMS for 10 years under the ServiceMaster company umbrella. Mr. Dunn founded EMD Mechanical in 1985, which later became one of the first companies acquired to begin the formation of AMS as it exists today. He has been a key executive on the AMS management team since its inception, and has been in the HVAC and construction industry for over 33 years. Mr. Dunn received his BS in Mechanical Engineering from The Johns Hopkins University. He enjoys deep sea fishing and spending time with his wife and children.

Dave Schellhardt
President

Mr. Schellhardt has served as President of AMS since 2006. In addition to his role as President, he serves as the General Manager of the Maryland office. Prior to 2006 Mr. Schellhardt served as CFO of AMS for 10 years. Mr. Schellhardt has been in the HVAC industry for over 27 years. He worked at Boland Trane for 10 years and at EMD Mechanical prior to joining the AMS management team with Mr. Dunn in 1996. Mr. Schellhardt received his BS in Accounting and Business Administration from Delaware State University. He enjoys playing golf in his spare time and spending time with his family.

Andy McCrossan
Chief Financial Officer & Vice President

Mr. McCrossan has been with AMS collectively for over 10 years. He previously served as the Controller for the Maryland office, joining the corporate office in 2007 and being elevated to CFO in 2009. Mr. McCrossan has over 20 years of industry experience and over 15 years experience serving as a Controller and/or CFO. He received his BS from the University of Maryland Business School and passed the Maryland CPA exam in 1995. Mr. McCrossan enjoys playing golf and spending time with his wife, two daughters and son.

Patti Hilton
Controller & Treasurer

Ms. Hilton began working at AMS in 1997. She has been in the construction and HVAC industry for 25 years. She received her BS in Management Studies at the University of Maryland, University College.

Chad Gazan
Corporate Controller

Mr. Gazan joined AMS in September of 2014, when he accepted the position as Corporate Controller. His previous 11 years of work experience was with a national public accounting firm and controller at a local construction company. He received his B.S. in Accounting and Business Management from West Virginia University and passed the CPA exam in 2009. Mr. Gazan enjoys spending his free time with his family.

Debbie Lotman
Director of Human Resources

Ms. Lotman joined American Mechanical Services in July of 2015 as the Human Resources Director. She has over 20 years of experience in the Human Resources field. She was Human Resources Director at Corporate Express for the Mid-Atlantic Region for 12 years and the Human Resources Director at Truland Systems for over 5 years. She received her SPHR in June of 2002. She's a HUGE Orioles fan and enjoys spending time at the beach with family.

Karl Ballwanz
Director of Corporate Safety

Mr. Ballwanz joined American Mechanical Services in March of 2015, when he accepted the position of Corporate Safety Director. Since 2007 he served as a Senior Safety Manager for Clark Construction over seeing large construction projects in the Baltimore metro area. Karl received his B.S. Degree from Millersville University (Lancaster Pennsylvania) in Occupational Safety and Health Management. He also has to his credentials, the Construction Health and Safety Technician (CHST), the Safety Trained Supervisor (STS) and the Graduate Safety Practitioner (GSP). He has extensive experience in work site safety inspections and audits. Mr. Ballwanz is a member of the National Safety Council, the American Society of Safety Engineers and is a certified OHSA 502 instructor. Karl is married, enjoys time at the beach with family and friends, is a lifelong Orioles and Raven fan.

Bryan Starr
Director of Information Technology

Mr. Starr came to AMS in 2007. He has worked in IT since 1982 when he started programming professionally at the age of 15. His education includes a B.S. in Computer Science and an MBA with an emphasis in Management Information Systems, both from the University of Missouri. Mr. Starr has worked on systems ranging from the mainframe databases and security at Chevron, down to mobile devices. He currently holds eleven Microsoft certifications including: Microsoft Certified Information Technology Professional - Enterprise Administrator, Microsoft Certified Systems Engineer and mulitple Microsoft Certified Technology Specialist certificates. He is married with two children and happily spends his free time with them.

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
SASCO/Electek
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 …...
COO
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
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