About Us

A Leading Mechanical, HVAC, Plumbing, BAS, Plumbing & Facilities Services Company

Illingworth-Kilgust Mechanical is the leading mechanical contracting firm in Wisconsin.By combining the unique commercial HVAC, plumbing and sheet metal fabrication capabilities, extended reach and advanced BAS and energy services expertise of two leading mechanical contracting firms - Illingworth Corporation of Milwaukee and Kilgust Mechanical of Madison - Illingworth-Kilgust Mechanical can provide clients across Wisconsin with the total mechanical solutions they need to meet their facilities’ full lifecycle requirements.

Our mechanical construction, BIM, and LEED expertise extends into many different industries.

From healthcare to manufacturing, from finance to entertainment, from education to government, we have the industry expertise and proven experience you need for efficient operation, reduced energy consumption, and a more effective response to today’s most complex and demanding facilities challenges.

The result is an experienced, reliable single-source mechanical construction and HVAC provider with a statewide presence, a talented team of highly trained, highly skilled professionals, and solid financial strength.

It's the right combination to complete your projects safely and on time, while delivering the sophisticated and dynamic systems required by today's high-performance facilities environments.