- Lighting Source, The
 - Manufacturers' representative for residential and commercial lighting, serving Michigan and Toledo, OH. - Scholtens Electric
- Electrical contractors specialising in commercial, industrial, and home generator systems.
- Advanced Tech Courses
- Offers a home study course for the Michigan state contractors' license examination.
- Automation Plus, Inc.
- Integrators focusing on small- to medium-sized manufacturers.
- Behler-Young Company, The
- Distributors of heating and air conditioning products.
- BuildersExam.com
- Offers test preparation software to obtain a builder's license and pass the Michigan Builders Exam.
- Forslund Building Supply, Inc.
- Building supply company serving the U.P. of Michigan and Northern Wisconsin.
- Madison Electric Company
- Wholesale distributor of electrical and electronic components, connectors, cable lines, construction lighting, & HVAC for commercial, residential, and industrial markets.
- Oakland Building Materials
- Distributor of acoustical ceiling materials as well as drywall, studs, and supplies. Serving the Midwest.
- Savage Heating and Air Conditioning Inc.
- Installing and servicing Lennox equipment.
- Windemuller
- Offers electrical and electronics integration to Western and Northern Michigan
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