Commercial HVAC Services and Plumbing Solutions
Hartwig Mechanical delivers reliable commercial HVAC services and plumbing solutions across Northern Illinois and Southern Wisconsin.
Over 65 years of experience
Full-Service Commercial HVAC and Plumbing Installs
For more than 65 years, Hartwig Mechanical has delivered reliable, high-performance commercial HVAC services and more across Northern Illinois and Southern Wisconsin. From emergency repairs to full-system installs, our team shows up ready to solve every mechanical need with no excuses or shortcuts.
HVAC Maintenance
Our preventive maintenance plans keep commercial systems running efficiently, with no downtime.
HVAC Installation
We install new systems, including commercial boilers and commercial chillers, tailored to your facility’s demands.
HVAC Repair
Hartwig Mechanical provides rapid-response emergency repair services. Our experienced techs resolve issues according to the highest standards.
Plumbing Installation
Meet demands and code compliance with precision plumbing installs for new construction, retrofits, or system upgrades.
Plumbing Services
Schedule ongoing plumbing support for leaks, clogs, and fixture maintenance in high-traffic commercial environments.
Building Automation Systems
Improve HVAC control, energy efficiency, and performance through integrated design-build solutions.
Our Partners
One Partner for Every Mechanical Demand
Hartwig Mechanical is an expert commercial HVAC contractor. But beyond that, we’re a service partner who stands behind our work. We take on mechanical construction projects with a clear goal: keep your systems operating reliably and efficiently. From installation to service, our commercial HVAC services are delivered with purpose and professionalism.
24/7 service response
Two dedicated offices
Skilled field crews
VDC team support
Commitment to jobsite safety
Industries We Serve
Manufacturing
We design and install systems that support high-demand environments, ensuring air quality, process efficiency, and consistent performance for your production floor.
Multi-Family Properties
Reliable HVAC and plumbing support for apartments, condos, and housing developments, designed to minimize disruption and maintain tenant satisfaction.
Healthcare and Medical Facilities
We bring precision and compliance to every project, ensuring HVAC and plumbing systems meet healthcare-specific performance and safety requirements.
Education
From K-12 buildings to higher education campuses, we support learning environments with dependable climate control and service availability.
Public Facilities
Courthouses, community centers, and government buildings benefit from our consistent, code-compliant mechanical services.
Retail and Hospitality
We support customer-facing spaces with commercial HVAC services built for comfort, efficiency, and flexibility.
Cold Storage and Processing Plant
Our work in temperature-sensitive environments includes installation and service of commercial chillers and support for complex process piping systems.
Our Success Stories
I got lucky and had somebody here within an hour. The plumber was very personable and professional. I will continue to hire this outfit for future needs. Thank you!
Would recommend Hartwig (especially Jack!) to everyone. Thank you for all of your help!
Areas We Serve
Hartwig Mechanical proudly serves Northern Illinois and Southern Wisconsin, with regional offices in Harvard, Illinois, and Rockford, Illinois. We’re positioned to respond quickly and manage jobs of any size across the full range of commercial mechanical needs.