Commercial HVAC Contractor

Commercial HVAC Services

A reliable HVAC system is critical to any workplace. It not only ensures worker comfort and productivity. An HVAC that fails in the height of the cooling or heating season can severely impact your business.


Whether you are installing a new system or repairing a current one, we are the Commercial HVAC Contractor you can rely on in the Chicagoland and Dekalb areas. If your HVAC is not functioning at its peak, we can assess your system and advise you about repair, replacement, or basic maintenance.

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Refrigeration/Freezer Repair and Installation

If your business relies on refrigeration, any downtime means a significant interruption and threatens the products that you store. We provide first-rate installation, repair, and maintenance for refrigerators, walk-in coolers, display cases, and other cold storage equipment. Restaurants, grocers, meat packers, hospitals, schools, and R&D facilities throughout Northern Illinois know they can rely on us.

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Backflow Services for Commercial Properties

The quality of your water is vital to the health and safety of employees, customers, and visitors. Backflow prevention keeps drinking water separate from non-potable water to ensure water safety. We are licensed to perform the backflow testing required by the State of Illinois and can also provide repair and replacement when needed.

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Test & Balance Services For Commercial Spaces

An unbalanced HVAC system is a faulty or inefficient HVAC. If your building has random drafts, fogged windows, unexplained humidity, air noises, doors unexpectedly shutting, hot and cold spots, or increasing utility bills, you may have an imbalance. We can test, adjust, and balance for a safer and more comfortable system.

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Building Controls

A 1 Source Mechanical Building Automation System (BAS) coordinates the control of critical building functions, including lighting, HVAC, plumbing, elevators, emergency and security systems, and more. You get centralized web-based commands so that you control these systems from any computer. The result is a “smart building” that is comfortable, efficient, and environmentally friendly.

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Commercial Boiler Repair & Installation

It gets cold in Northern Illinois, and a problem with your boiler requires immediate attention from a qualified boiler repair technician. We install and maintain boiler systems, and, if you have a troublesome boiler, we can diagnose the problem and provide the needed repair, replacement, or maintenance.

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Commercial Water Heater Repair & Installation

You demand a lot from your water heater, and the heavy year-round use it experiences requires regular maintenance, especially as equipment ages. Chicago area customers rely on us for that maintenance, and we also provide repair or installation of new water heaters when the need arises.

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Where We Serve


Looking for commercial HVAC services? 1 Source Mechanical has offices in DeKalb and Oak Brook to serve you. Our wide service area covers much of northern Illinois, from Chicago to Dixon, Rockport to Marseilles, and everywhere in between.


If you don't see your city, simply reach out to us! There's a great chance that we cover your area, too.

Competent. Trustworthy. Genuine.

1 Source Mechanical technicians average 20 years of experience, and they have seen every kind of variation that HVAC installation and repair presents. We provide consistent and reliable service in Chicago, Dekalb, and everywhere in between. Whether you have an emergency or need us to assess the state of your equipment, contact us for a free estimate.

Why choose us ?

24/7 Emergency Service  |  Union-Trained Employees  |  OSHA Certified
Technicians Average 20 Years of Experience  |  Fully Insured, Licensed, and Bonded
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