Executive Profiles


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.

Damon Johnson
General Manager
American Mechanical Services of Houston, L.L.C.

Mr. Johnson was named Assistant GM of the Houston office in January of 2022 then subsequently became General Manager in January 2023. He started with AMS in 2011 as a Project Manager/Estimator working on some of the office’s largest account. Mr. Johnson’s career began as an engineer in the auto industry moving to power generation then eventually general contracting. In his role at the general contractor, Mr. Johnson became acquainted with AMS and eventually took an open position in the Houston office. He holds a Bachelor’s degree in Mechanical Engineering from Florida Agricultural and Mechanical University and a Master’s Degree from Rensselaer Polytechnic Institute in Engineering Science (Management of Technology). He also holds a State of Texas Class “A” mechanical license with endorsement for both comfort cooling and refrigeration. Mr. Johnson is married with two teen children that keep him busy going to all their events. 8:07 AM 4/27/2023

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.

James (JD) Markle
General Manager
AMS Mechanical Services of Indianapolis, L.L.C.

Mr. Markle was named GM of the Indianapolis office in July of 2019. He has an MBA and is an experienced business professional with a demonstrated history of working and developing companies and people in multiple industries. Skilled in Sales & Distribution, Direct Sales, Customer Relationship Management (CRM), Sales Management, and Indirect Channel Sales. Strong entrepreneurship skill set focused in Business, Management, Operations and Related Support Services and recognized for strategic planning, organization and commitment in achieving goals, driving revenue and ensuring operational efficiency. Mr. Markle is a graduate of Purdue University, husband and father of two.

Charlie McDaniel
General Manager
American Mechanical Services of Maryland, L.L.C.

Mr. McDaniel has been with AMS for just four years before becoming General Manger. However, he’s been in the HVAC trade for twenty-three years, joining Union Local 602 out of High School. He began as a welder and then turned his attention to chillers and installs. He worked in the field for fifteen years and spent the last eight years in different roles, including Project Manager, Service Manager, Businesses Development and Director of Service Operations. He currently holds Maryland and Virginia Master HVAC Licenses. He’s been married for 15 years and has 4 children. He enjoys spending time with his friends and family.

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.

Doug Sitch
General Manager
Air Conditioning Associates, Inc. dba Denver Boiler

Mr. Sitch has served as the General Manager at ACA since April 2021 and has been with ACA 13 years; with a total of 31 years HVAC experience. As a journeyman, he received several HVAC certificates. In 2014 he accepted the Service Manager position with ACA and held that position until April 2021 when he was promoted to General Manager. He carries all state and local municipality licensing and an International Code Council Master Mechanical license. Mr. Sitch’s expertise is in commercial HVAC systems which includes building evaluations, proposals, management, budgeting, customer relations and sales. Mr. Sitch enjoys spending his free time with his wife doing home projects, travel (particularly cruises around the world), and the many activities Denver has to offer.

Matt Sweetser
General Manager
American Mechanical Services of Denver, L.L.C.

Mr. Sweetser has been with AMS Denver for over 27 years. He began his career with AMS as a Delivery Driver and soon transitioned into the field as a HVAC Apprentice Technician. After completing the 5-year apprenticeship he became a Journeyman Technician. In 2007 Mr. Sweetser accepted a Service Manager position with AMS and held that until 2019 when he was promoted to General Manager of the Denver office. He carries all state and local municipality licensing and an ICC Master Mechanical designation. Mr. Sweetser has expertise in commercial building HVAC systems which includes technical resourcing, repair, management, budgeting and sales. He is very proud of his roots and all the positions he has held with AMS. Mr. Sweetser is a devoted family man and enjoys spending his time off camping, fishing and in the outdoors.

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.


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.

Andy McCrossan
Chief Financial Officer & President

Mr. McCrossan has been with AMS collectively for over 20 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 30 years of industry experience and over 25 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.

Patrick Collier
Corporate Safety Director

Mr. Collier joined the AMS Corporate Office in March of 2019, as the Corporate Safety Director. Previously he had been with Anderson Air Conditioning, LP, an AMS office located in Fullerton, California, overseeing construction health and safety since 2016. He is a US Army veteran and proudly served with the 11th Armored Calvary Regiment for 6 years. He has his credentials from the Board of Certified Safety Professionals for Construction Health and Safety Technician (CHST). In his free time, he enjoys the outdoors and spending time with his wife and daughter.

Bryan Starr
Director of Information Technology

Mr. Starr came to AMS in 2007. He has worked in IT since 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 happily married with a son and daughter in college.

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