Upper Midwest HVAC & plumbing manufacturers’ representatives We grow manufacturers’ sales.

Mike Dungan, CPMR, has helped more than 50 manufacturers grow sales and build profitable business over a career of more than three decades. His experience owning and leading SEI combines HVAC equipment knowledge with distribution strategy and long-standing contractor relationships. Mike understands what it takes for a distributor to support a line and what gives contractors the confidence to choose it.

That perspective shapes his work in account development and in building lasting demand for the manufacturers SEI represents. He serves Minnesota, North Dakota, South Dakota and Wisconsin.

Michael Dungan is Vice President of Sales Engineers, Inc. and a Certified Professional Manufacturers’ Representative (CPMR). He entered the HVAC industry in 2016 and became Vice President in 2025.

His experience spans residential, light commercial and commercial equipment, including VRF, unitary and boiler systems, along with professional HVAC tools, gas piping and radiant heating. He builds distribution and contractor demand through dealer onboarding, sales blitzes, counter days and hands-on product training. Michael is a graduate of HARDI’s Emerging Leaders program and serves on an AIM/R committee.

Based in Minnesota. Core markets include Minneapolis–St. Paul, Rochester and southern Minnesota, select Duluth accounts, western Wisconsin, and all of South Dakota.

Todd Montgomery leads SEI’s eastern expansion, drawing on years of HVAC distribution experience at Ferguson and First Supply, including HVAC segment leadership. He helped establish SEI’s Chicago market and brings deep distributor and contractor relationships across Wisconsin and Illinois.

Todd understands how a line gains support inside a distribution business, from sales leadership to the branch teams serving contractors. He applies that experience to developing markets where manufacturers have struggled to gain traction, working with SEI’s eastern team to build distribution and contractor demand across Wisconsin, Illinois and Indiana.

Zach Ziroll leads SEI’s work in Michigan and also covers Indiana. His background includes Robertson Heating Supply and Johnstone Supply, spanning warehouse and counter operations, territory sales and branch management. At Robertson, he led the new Brighton, Michigan branch.

That experience gives him a practical understanding of what a distributor needs to stock, explain and support a line. Zach works with branch teams and contractors on product education and applications, drawing on experience with communicating and zoned HVAC systems, radiant heating, press connections and alternatives to brazing.

Covers Michigan and Indiana, with current field activity in metro Detroit, Grand Rapids, Lansing, and northern Indiana.

Sean Trudeau brings decades of HVAC experience across bid/spec representation, sales for multiple manufacturers and the contractor side of the business. His time with F.E. Moran gave him firsthand exposure to mechanical contracting, working alongside technical, sales and support teams.

His relationships reach commercial HVAC contractors throughout Chicago and Illinois, as well as engineers and the union community. Sean understands the different priorities involved in specifying, selecting and putting equipment to work. He brings that perspective to SEI’s manufacturers across Illinois and Indiana, connecting product knowledge with the people who influence commercial HVAC decisions.

Brent Johnson joined SEI in 1995 and covers North Dakota and Minnesota. He brings practical experience in piping, line sets, venting, hand and power tools, leak detection, and combustion analysis.

His work connects distributor development with the training that supports a new line: presenting to ownership and sales teams, coordinating branch visits, and training contractors and inspectors. In North Dakota, that has included introducing a CSST gas-piping line and making joint field calls with distributor territory managers.

Serves Minnesota and North Dakota, with experience supporting markets shaped by mining and lumber in northeastern Minnesota, agriculture and food processing in eastern North Dakota, and energy industries in western North Dakota.

Greg Miller is SEI's Territory Manager for South Dakota. He connects manufacturers, distributors, and contractors with SEI's HVAC equipment, plumbing, and professional tool representation in the state.

Brian Quittschreiber provides dedicated inside sales support for SEI's complete seven-state territory. He supports the field team and helps connect contractors and distributors with the right SEI representative.