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.

About Us

With over 120 years of combined 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.