Illingworth-Kilgust Mechanical, a wholly owned subsidiary of EMCOR Group, Inc., combines two leading mechanical contracting firms – Illingworth Corporation of Milwaukee and Kilgust Mechanical of Madison – into one of the largest and most experienced companies of its kind in Wisconsin.

Pink Hard Hats

For the month of October, our employees are wearing pink hard hats to support Breast Cancer Awareness. Read more.

Energy Tips to save you money

About Us

With over 85 years of HVAC and mechanical services experience, Illingworth-Kilgust Mechanical provides clients statewide with the total mechanical solutions they need to meet their facilities' full lifecycle requirements. Learn about us.


By integrating our strengths, we can offer a wider range of mechanical construction expertise and a broader array of commercial heating and cooling, plumbing systems, building automation systems design/build, and facilities services to more clients across Wisconsin than ever before. Learn more.

Meet the Team

Dan Pfeifer, President of Illingworth-Kilgust Mechanical Dan Pfeifer, President, is just one of the many people that deliver high performance projects that meet our clients most exacting standards.

Meet the rest of the team.