We service Barrington, IL & Greater Chicagoland. Not sure if we service your area? Give us a call.
When it comes to keeping your business comfortable and operational year-round, you need a commercial HVAC contractor in Barrington, IL you can trust. At RJ's Heating, Cooling & Water Heaters, we provide expert light commercial heating and cooling services, including rooftop units (RTUs), boiler systems, and customized maintenance solutions tailored for offices, retail locations, light industrial spaces, restaurants, and more.
We've built a reputation in the Northwest Chicago area for responsive service, technical precision, and long-term reliability. Whether you're managing one building or multiple locations, RJ's delivers performance-focused commercial HVAC services that protect your investment and your people.
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RJ's brings over 20 years of experience in commercial systems, with solutions that are energy-efficient, code-compliant, and customized to your space. We offer:
Whether you're upgrading outdated equipment or fixing a sudden system failure, we respond fast and work efficiently so your business can keep running without costly delays.
Rooftop units (RTUs) are a staple for commercial buildings because of their space-saving design, centralized controls, and all-in-one heating and cooling capabilities. At RJ's, we specialize in the installation and service of RTUs up to 25 tons, offering systems that are durable, high-efficiency, and built for the demands of commercial use.
We service and install leading RTU brands including Armstrong, MagicPak, and others trusted across commercial industries.
Our commercial HVAC techs diagnose RTU issues quickly and provide cost-effective solutions to keep your business comfortable and efficient.
If your commercial building relies on a hydronic or steam boiler system, RJ's provides expert-level installation, repair, and maintenance services for both traditional and high-efficiency units. We service light commercial boilers for multi-family buildings, offices, medical facilities, schools, and more.
Boilers offer consistent and even heating, especially in larger buildings with radiant systems or older properties that don't use forced air. Our licensed techs will ensure your system is running safely, efficiently, and within code.
Whether you're installing a new system or keeping your existing boiler in peak condition, RJ's is your go-to boiler expert in Barrington, IL.
Unexpected system breakdowns are costly—not just in repair bills, but in productivity, customer satisfaction, and comfort. RJ's offers custom HVAC maintenance plans for commercial clients in Barrington, IL and beyond.
We build each plan around your needs—so whether you have one RTU or several zones with boilers and ducted units, we'll protect your investment with reliable, scheduled service.
If you're remodeling, relocating, or building out a new tenant space, RJ's works with property managers and contractors to design and install HVAC systems tailored to your commercial build. We coordinate closely with architects, engineers, and GCs to ensure everything is completed on time, on budget, and code-compliant.
We'll help ensure your new space is built for long-term comfort and cost-efficiency.
At RJ's Heating, Cooling & Water Heaters, we believe that quality HVAC services should be affordable for every homeowner and business. That's why we offer flexible financing options to help you invest in new heating, cooling, or water heating systems without financial stress.
Whether you need a new furnace, air conditioner, or water heater, our trusted financing partners make it easy to spread out payments over time. Contact us today to learn more about your financing options in Barrington, IL!
Apply NowOur commercial HVAC team is equipped to handle all types of light commercial HVAC service requests, including:
We know how to troubleshoot, repair, and maintain multi-zone systems while keeping disruption to your business minimal.
Prevent costly breakdowns and keep your HVAC system running at peak efficiency year-round with our Comfort Club Maintenance Plan. Routine HVAC maintenance improves energy efficiency, extends system lifespan, and prevents unexpected failures. Regular maintenance saves you money on energy bills and prevents costly emergency repairs. Sign up today and enjoy worry-free heating and cooling throughout the Chicagoland area!
Join Our Comfort Club Comfort Club DetailsSeasonal HVAC tune-ups to ensure optimal performance.
Priority service—jump to the front of the line for repairs.
Exclusive discounts on repairs and system replacements.
Extended equipment lifespan through regular maintenance.
Furnace and AC inspections & tune-ups
Ductwork and air filter checks
Refrigerant level and thermostat calibration
Water heater efficiency checks
At RJ's Heating, Cooling & Water Heaters, we are:
As a family-owned HVAC company with over 20 years of experience, we proudly serve Barrington and Northwest Chicago. As an Armstrong Pro and Aprilaire Partner, we deliver trusted, high-quality comfort solutions.
We offer 24/7 emergency service for HVAC and water heaters, upfront pricing with no surprises, and highly rated craftsmanship trusted by home and businessowners throughout the region.
We proudly install and service trusted brands like Armstrong, Ducane, MagicPak, Daikin, Burnham, Weil-McLain, Aprilaire, Reme Halo, and State Water Heaters—ensuring lasting performance and comfort you can rely on.
We proudly serve Barrington, IL, and Northwest Chicago, covering areas such as:
RJ's Heating, Cooling & Water Heaters provides commercial HVAC service for a wide range of businesses, including retail stores, restaurants, medical offices, schools, churches, warehouses, multi-family housing, and light industrial spaces. If you're in or near Barrington, IL, we can tailor a solution to your building's specific needs.
A rooftop unit, or RTU, is a self-contained heating and cooling system installed on the roof of a commercial building. RTUs are ideal for businesses because they save indoor space, simplify zoning, and provide easy access for maintenance without disrupting your operations. They're also scalable and available in sizes up to 25 tons, making them suitable for small to medium-sized commercial properties.
We recommend servicing your RTU at least twice a year—once before the cooling season and once before the heating season. Regular maintenance helps ensure efficiency, extend system life, and reduce the risk of emergency breakdowns.
Yes. We specialize in light commercial boiler systems, including Burnham, Weil-McLain, and Navien combi-boilers. These systems are commonly used in multi-unit buildings and commercial spaces where radiant or hydronic heating is preferred. Our team handles everything from installation and start-up to repairs and descaling.
Common signs include uneven heating, fluctuating pressure, frequent lockouts, unusual noises, and visible leaks or corrosion. If your boiler is underperforming or triggering fault codes, it's time to schedule a professional inspection.
Unit sizing depends on square footage, layout, insulation, number of occupants, equipment heat load, and more. At RJ's, we conduct manual load calculations to determine the exact capacity needed and recommend properly sized units ranging from 2 to 25 tons.
Yes. RJ's can retrofit your outdated RTU or boiler with a modern, energy-efficient model. We'll help you choose equipment that qualifies for energy rebates and meets current building codes. Our team handles all necessary modifications, including curb adapters, ductwork transitions, and control upgrades.
Absolutely. We know that a failed heating or cooling system can disrupt business operations, cause product spoilage, or create unsafe conditions for staff and customers. That's why RJ's offers 24/7 emergency repair for commercial HVAC systems, including rooftop units and boilers.
Our commercial maintenance agreements include seasonal inspections, coil cleaning, filter changes, thermostat calibration, electrical checks, refrigerant level inspection, and testing of blower motors, burners, and safety switches. Plans are customized to your systems and usage level, and they come with priority service and discounted repair rates.
Yes. We work with property managers, landlords, and general contractors to install HVAC systems for new tenant spaces, expansions, and renovations. This includes system design, duct layout, zoning, thermostat installation, and coordination with other trades for a smooth build.
Improving IAQ involves proper ventilation, filtration, and humidity control. RJ's offers duct cleaning, UV air purifiers, commercial humidifiers, dehumidifiers, and filter system upgrades to help businesses meet ASHRAE and OSHA guidelines and provide a healthier environment for employees and customers.
Yes. Whether your building uses multiple RTUs, a boiler with zone valves, or split systems, we provide zoning analysis, repairs, and optimization to ensure balanced airflow and consistent temperatures throughout your facility.
RJ's installs and services top-performing brands like Armstrong, MagicPak, Burnham, Weil-McLain, Daikin, and Ducane, as well as many other industry-standard commercial HVAC manufacturers. We also work on legacy equipment and can help you transition to newer, high-efficiency systems.
You can call RJ's directly or use our online contact form to schedule a service visit or site consultation. We're happy to provide estimates, inspections, or full proposals based on your building's needs and goals.
Check out our latest coupons and special offers to get quality HVAC service at a great price.
When your business needs reliable heating, cooling, or ventilation, trust the experts at RJ's Heating, Cooling & Water Heaters. With more than 20 years of experience serving commercial clients across Barrington, IL, we understand the unique challenges of keeping your facility comfortable and operational throughout the year.
Whether you're dealing with an aging rooftop unit, inefficient boilers, or zoning problems that disrupt your workspace, RJ's delivers dependable commercial HVAC services designed around your goals. We install, repair, and maintain RTUs up to 25 tons, light commercial boiler systems, ducted heating and cooling, and multi-zone temperature control systems. No matter the size of your business, our team brings unmatched attention to detail, fast turnaround times, and clear communication from start to finish.
If you're building out a new space or replacing old equipment, we'll help you select high-efficiency commercial HVAC systems from trusted brands like Armstrong, Burnham, MagicPak, and Weil-McLain—ensuring your system performs reliably while keeping operational costs in check. Our team handles every step of the process, including load calculations, ductwork fabrication, and control configuration, so your system is customized to fit your space, workflow, and budget.
We also offer custom maintenance agreements that protect your investment and help prevent costly, unplanned breakdowns. Whether you need quarterly filter changes, seasonal RTU tune-ups, or boiler servicing before winter, our Comfort Club Commercial Plan keeps your system performing at its best all year long.
Our service area covers Barrington, IL, and nearby communities including Schaumburg, Palatine, Hoffman Estates, Skokie, and Oak Park, so you can count on us whether you manage one facility or multiple locations across the Northwest suburbs.
If your commercial HVAC system needs an upgrade, emergency repair, or regular maintenance, we're here to help. Contact RJ's Heating, Cooling & Water Heaters today to schedule your commercial HVAC consultation or service in Barrington, IL. Let's get started—and keep your business running efficiently, comfortably, and confidently.
872-274-4502 Schedule Today
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