Illingworth-Kilgust Mechanical



With over 120 years of combined HVAC and mechanical services experience, Illingworth-Kilgust Mechanical is one of the largest and most experienced companies of its kind in Wisconsin. Providing clients with the total mechanical solutions they need to meet their facilities’ full lifecycle requirements. Our increased strength enables us to offer a wider range of expertise and a broader array of services across the state. Illingworth-Kilgust Mechanical gives clients a single source for the leading-edge solutions and complete services needed to design, install, commission, and maintain today’s high-performance mechanical systems. We provide a full line of high quality mechanical services, including, HVAC, plumbing, industrial piping, air duct systems, and fire-rated HVAC systems, which are customized to meet your specific requirements. Our services are backed with an extensive team of highly experienced engineers, project managers, plumbers, metalworkers, technicians, and other experts. We are dedicated to providing clients with award-winning safety and first-in-class service. Our Quality Assurance Program ensures that we meet all customer, statutory and regulatory requirements, support our zero accident values, manage costs and risks, and continuously improve our processes and methods for consistent, measurable, and repeatable quality on every project.


Air Conditioning, Heating, Plumbing, Building Automation, Building Operations, Energy Savings Solutions, Test and Balancing, Commissioning/Retro-commissioning, Data Center AC Service, Design and Installation, Chiller Replacement and Repair, Boiler Service and Replacement

States Served:



Contact Name:

David Bavisotto

Contact Title:

VP - Service

Contact E-mail:


11217 West Becher Street
West Allis, WI 53227