Rooftop units
Service, repair, and replacement for packaged RTUs — gas-electric, heat pump, and dedicated outside air units — sized for Chicago winters and the summer cooling load.
Service
Commercial HVAC
Heating, ventilation, and air conditioning service for commercial facilities across Bensenville, the O'Hare corridor, and Chicago's suburbs — from an emergency rooftop-unit repair at 2 a.m. to a full equipment changeout.
What we service
Every system on the roof and in the mechanical room.
Our techs work the full breadth of light-commercial HVAC — packaged units, boilers, split systems, ventilation, and the controls that tie them together.
Boilers & hydronic heat
Hot water boilers, pumps, and hydronic distribution — combustion analysis and tuning, glycol systems, and the code-required inspections an Illinois heating season demands.
Split systems & heat pumps
Commercial split systems, VRF, and heat pumps for offices, clinics, and tenant spaces — diagnosis, refrigerant management, and end-of-life replacement.
Air handlers & ventilation
AHUs, fan coils, exhaust and make-up air — coil cleaning, motor and bearing replacement, airflow balance, and ventilation that keeps kitchens and shops legal.
Controls & thermostats
Smart thermostats, zone controls, and equipment controls — set up so your building runs itself and your energy bill shows it.
Commercial IAQ
Filtration upgrades, UV-C, humidification, and ventilation surveys — tenant comfort and air quality your property manager can stand behind.
Why Comfort Indoor Solutions
We service what we install — and we install what we service.
Most HVAC firms split into install crews and service crews that don't talk. Ours don't. The tech who shows up to fix your rooftop unit has probably worked on the crew that put it there — and with technicians averaging more than 15 years at CIS, the institutional knowledge of your building doesn't walk out the door.
That means faster diagnosis, cleaner repairs, and a service record that actually reflects what's on your roof — whether that's a restaurant in Addison, an office in Schaumburg, or a warehouse off the O'Hare corridor. After nearly five decades of servicing Chicagoland's buildings, there aren't many systems we haven't seen.
- Servicing Chicagoland's buildings since 1978
- Factory-trained on major commercial equipment lines
- EPA-certified techs on every truck
- Manufacturer warranty handling — we file the paperwork, you don't
- Aligned with your in-house facilities team, not in competition with them
- Same crew for service and projects — no handoff friction
Ready to talk?
Let's keep your buildings running.
Tell us about your facility — current equipment, pain points, expansion plans — and we'll come back with a proposal.