Hartwig Mechanical has been on the ground for over 65 years, providing HVAC, plumbing, and design-build services across a broad service region. With an office positioned in Harvard, Mokena, and Rockford, Illinois, our team covers everything from dense suburban corridors to wide industrial zones. Our crews move quickly, show up prepared, and know the territory. Whether it’s a commercial site near Chicago or a manufacturing facility further west, we’re built to respond across the region with no compromise in speed, quality, or service.
We proudly serve Northern Illinois and Southern Wisconsin, covering major business hubs and surrounding counties with reliable, full-scope mechanical work.
Serving Chicago’s northern suburbs and more, our Harvard office supports multiple commercial and industrial clients.
From our Rockford base, crews are deployed daily across, serving facilities of all sizes.
From our new Mokena locations, crews are deployed daily across, serving facilities of all sizes.
Whether you’re managing a growing facility in the suburbs or a long-standing plant in a rural county, Hartwig Mechanical has you covered. Our field teams regularly work across a multi-county region, bringing the same high standards, safety protocols, and reliability to every site. We serve many counties, including: