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Our Sales Team

At Mainstream, we are proud to be your trusted partner for your air handling needs. Our reps are always available to walk you through our product features and customizations.

Learn more about our sales team below, and let us know how we can help you! Check out our careers page to learn about joining our team.

Sheldon Markham

Sheldon has held the role of IntelliCUBE Sales Lead at Mainstream since 2020. For six years prior, he also worked with the Mainstream team as the Engineering Team Lead and on the Inside Sales & Engineering team.

Sheldon has a comprehensive knowledge of fan arrays and HVAC systems and ample hands-on experience gained from helping countless clients get the HVAC equipment they need.

Get in touch with Sheldon to discuss your next fan array project.

Contact Sheldon

Greg Ewing

Greg is a long-term colleague at Mainstream and knows the ins and outs of commercial HVAC, coils, and fan arrays better than anyone. His meticulousness is an asset in performing onsite measuring services to ensure clients get perfect match replacement coils.

Greg’s strengths include project management, customer service, and business development.

Get in touch with Greg to discuss coils or EC fan arrays.

Contact Greg

Ron MacPherson

Ron has served as Mainstream’s Mid-Atlantic Account Manager since 2009. With over 28 years of sales experience, Ron has an innate ability to listen to clients’ needs and deliver exactly what they are looking for. Ron travels between New Jersey and Virginia servicing and developing accounts focusing on coils and fan arrays but willing to help his customers find a solution to many of their HVAC dilemmas outside of coils and fan arrays.

Get in touch with Ron to discuss your next commercial HVAC project.

Contact Ron

Courtney Lock

Courtney has been Mainstream’s New England Account Manager since 2016. Based out of Canton, MA, Courtney services commercial and institutional HVAC systems accounts. He is centrally located to get to any project in New England quickly for an on-site survey

With over 30 years of experience in HVAC, ranging from Pipefitting to Commissioning, to Project Management and as a Sales engineer, Courtney is a master at getting to the bottom of what a client really needs, and delivering accurate solutions quickly. Courtney has worked on all the systems we provide, so can assist with designing HVAC coils and Fan Array systems to match client needs perfectly.

When he is not at work, he likes to be somewhere nearby cold water with children and his grandson.

Get in touch with Courtney to discuss your New England-based commercial HVAC project.

Contact Courtney

Sharon Coulter

Sharon joined Mainstream in 2008 and now leads Inside Sales. Her rich subject matter expertise makes he an asset to any HVAC project.

Get in touch with Sharon to discuss coils or EC fan arrays.

Contact Sharon

Jim Markham

Jim has over 30 years of experience in the industry, getting his start with a local HVAC contracting firm in the early 90s. Over the past 25 years, Jim has been a key driver of the innovation and product development that has set the course for Mainstream’s continued growth and success.

Jim’s subject matter expertise encompasses much of the commercial air handling and heat transfer industry, making him a trusted resource for engineers and customers alike.

Get in touch with Jim to discuss partnerships with Mainstream.

Contact Jim

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