Commercial Rooftop HVAC Chicago – RTU Install, Repair & Service
Installation, Replacement, Repair & Maintenance for Chicago Businesses
Rooftop units are the workhorse of Chicago commercial buildings, and when one fails, your business feels it fast. Browns Heating & Cooling installs, replaces, repairs, and maintains commercial rooftop HVAC systems (RTUs) across Chicago, keeping your offices, retail floors, and facilities comfortable and open.
Since 2016, our EPA-certified technicians have served Chicago businesses with a BBB A+ rating and 24/7 emergency response at no extra charge. We handle the full scope, from load calculations and crane coordination to permits and commissioning, so your project stays on schedule and your doors stay open.
Our commercial rooftop services:
- RTU installation: right-sized, code-compliant packaged units
- RTU replacement: efficient upgrades, often on your existing curb
- RTU repair: fast diagnostics for every major component
- Preventive maintenance: biannual service to prevent downtime
- Crane coordination & permits: the heavy logistics, handled
- 24/7 emergency response: with no after-hours surcharges
Keep your building running. Get a free commercial rooftop assessment.
Call (708) 536-8134 or contact us online.
CONTACT US
What Is a Rooftop Unit (RTU)?
A rooftop unit is a self-contained, packaged HVAC system mounted on your building’s roof. It combines the compressor, coils, blower, heating, filtration, and often an economizer into a single cabinet that connects to your ductwork below.
RTUs are the standard for Chicago commercial buildings for good reason. They free up valuable indoor and ground space, they’re easy to service without disrupting your business, and they scale easily, multiple units can serve different zones of a large building independently.
Our Commercial Rooftop Services
RTU Installation
We install packaged rooftop units sized precisely to your building’s load, typically ranging from 3 to 25 tons. Every install starts with a proper load calculation, not a guess, so you avoid the short-cycling and high bills that come with an oversized unit.
RTU Replacement
When a unit is 15+ years old or facing a major failure, we replace it, often on your existing curb to save time and cost. Modern high-efficiency units can cut energy use significantly compared to aging equipment, paying you back every month.
RTU Repair
Our technicians diagnose and repair every major RTU problem: compressors, refrigerant leaks, control boards, economizer actuators and dampers, igniters, gas valves, blower motors, and condensate issues. We red-tag and immediately report any cracked heat exchanger, a critical safety concern.
Preventive Maintenance
Because rooftop units face Chicago’s full weather extremes, we recommend biannual maintenance, spring and fall. We clean coils, check refrigerant, calibrate economizers, service belts and drainage, and document everything, catching small issues before they shut you down.
Our RTU Installation & Replacement Process
A rooftop unit is only as good as its installation. We follow a proven, disruption-minimizing process.
1. Site assessment & load calculation: We evaluate your roof’s load capacity, existing curb, electrical, and gas, and calculate your building’s true heating and cooling load to size the unit correctly.
2. Equipment selection: We recommend the right configuration, gas/electric, heat pump, economizer-equipped, based on your load and budget, and give you a written quote covering equipment, labor, crane, and permits.
3. Crane coordination & rigging: RTUs are heavy, so we plan the crane lift and safety zone around your operations to minimize downtime, and verify curb and roof compatibility.
4. Connections & commissioning: We tie in ductwork, electrical, and gas, then verify refrigerant charge, airflow balance, thermostat calibration, and economizer function before the job is complete. Our airflow testing and balancing confirms even performance.
Should You Repair or Replace Your RTU?
We give you an honest, numbers-based answer, never an upsell. The industry rule of thumb is to replace when a repair exceeds 50% of replacement cost, or when a unit is 15+ years old with a major component failure like a compressor.
Chicago’s demanding climate accelerates wear, since RTUs run hard in both heating and cooling seasons. When replacement is the smarter move, the energy savings from a modern high-efficiency unit often justify the investment. We’ll walk you through the real costs so you can decide with confidence.
Rooftop HVAC for Every Type of Chicago Business
We size and configure rooftop units for the specific demands of your industry. Whatever your building does, we have the right RTU solution:
We serve restaurants with rooftop units configured for kitchen heat loads and make-up air, warehouses and industrial facilities needing high-capacity airflow, medical and dental offices requiring precise climate control, gyms and fitness centers, churches and facilities, and property managers overseeing multi-tenant buildings. Building new? We handle rooftop systems for new commercial construction too. See all our commercial HVAC services.
We Also Service Residential Rooftop Systems
While rooftop units are most common on commercial buildings, they’re also found on flat-roofed and urban Chicago homes where ground space is limited. We install, repair, and maintain residential rooftop systems too, delivering the same efficient, reliable service. Explore our residential heating and cooling options if a rooftop system fits your home.
Why Choose Browns Heating & Cooling?
- 24/7 Emergency Response: real help any hour, no surcharges
- Minimal Business Disruption: we work around your operations
- Full-Scope Logistics: crane coordination, curbs, and permits handled
- Honest Repair-or-Replace Advice: real numbers, no upselling
- EPA-Certified Technicians: every major brand and system
- Documented Maintenance: reports and priority dispatch
With 10+ years serving Chicago businesses, a BBB A+ rating, and a 4.9-star reputation, we’re the commercial rooftop team Chicago trusts, backed by our satisfaction guarantee and responsive customer service. Ask about financing for larger projects.
A Reputation Built on Trust and Quality
The techs arrived exactly on time at the start of the appointment window, and quickly found the issues (dirty condenser coils, refrigerant top-off, and system sealant to address the small leak). Ramond clearly explained the impact of each along with the cost to fix, then confirmed which services I wanted and what my total would be before starting the work. I also appreciate that Ramond answered all my dumb questions about how air conditioning actually works; he's a great science teacher 🤓.
The cost was less than I expected for a next-day service (coil cleaning $239, sealant $285, and a few pounds of refrigeratant was $370).
During the payment process, the tech didn't prompt for a tip, unlike most companies. So don't forget to ask them for their Zelle/Venmo if you want to send a tip
Angelique on the phone gave clear instructions on what I needed to do before the service guys showed up. Ramod & Eric were courteous and wore shoe covers as they entered the house. They took a quick look and knew what needed to be done immediately.
As a Realtor, I’ve changed many an AC units and their prices were very fair. We ended up repairing instead of a new AC unit. The repair was less than what he originally quoted. How is that for honest service?! Amazing!
They will have to come back for a service ($99) as we ran out of time.
I can highly recommend Browns Heating & Cooling without any hesitation.
Schedule Commercial Rooftop HVAC Service in Chicago
Keep your business comfortable and running with a rooftop HVAC partner Chicago trusts. Whether you need a new RTU, an efficient replacement, urgent repair, or a maintenance plan, we’re ready. Call (708) 536-8134 or request a free assessment online.
Frequently Asked Questions
How long do commercial rooftop units last?
Most commercial RTUs last 15 to 20 years with regular maintenance. Units that receive biannual preventive service reliably reach the top of that range, while neglected units fail sooner, often at the worst time.
When should I replace an RTU instead of repairing it?
The rule of thumb is to replace when a repair exceeds 50% of the replacement cost, or when the unit is 15+ years old with a major failure like a compressor. We provide an honest repair-versus-replace analysis with real numbers.
Do you handle the crane and permits?
Yes. We manage the full logistics, crane coordination, rigging, roof and curb verification, and all required mechanical and electrical permits, so your project runs smoothly and passes inspection.
Can you replace my unit on the existing curb?
In most cases, yes. We can often install a modern, efficient replacement on your existing curb, sometimes with a curb adapter, which saves time and cost compared to a full rebuild.
How often should a commercial rooftop unit be serviced?
Twice a year, in spring and fall, so the unit is ready for both cooling and heating season. Regular maintenance prevents costly breakdowns, extends equipment life, and keeps energy bills down.
What's an economizer, and why does it matter?
An economizer pulls in cool outdoor air for “free cooling” when conditions allow, reducing compressor load and energy costs. A failed economizer quietly wastes money, which is why we check it on every service visit.