Best HVAC Companies in Oak Brook, IL: 2026 List

We analyzed dozens of HVAC companies serving Oak Brook, IL, and narrowed the list to the top eight that answer fast when heating or cooling fails. Our team checked every published Google rating against each company’s service scope and after-hours coverage, then weighted the findings below.

How We Ranked Oak Brook HVAC Companies

• Verified Google Reviews (30%): Published rating and volume anyone can check.
• Whole-Home Service Range (25%): Systems covered beyond heating and cooling.
• 24/7 Call Answering (20%): Who picks up when a furnace quits overnight.
• Years Serving Chicagoland (15%): Time working local homes.
• Residential Focus (10%): Property types the company actually serves.

The Best 8 HVAC Companies in Oak Brook

Rank	Company	Google Reviews*	Offers Services Beyond HVAC	Available 24/7	Years	Residential Focus
1	Four Seasons	4.7 (30,700+)	Yes	Yes	55	Homes, plus commercial
2	Air-Rite Heating & Cooling	4.9 (1,900+)	No	Yes	67	Homes, plus commercial
3	Nortek Environmental	4.9 (390+)	No	Yes	25	Homes, plus commercial
4	Airworks Radiant	4.8 (45+)	No	Yes	22	Homes, plus commercial
5	Climate Change Inc.	4.7 (35+)	No	No	20+	Homes only
6	Geothermal Energy Solutions	4.5 (2)	No	No	28	Homes, plus industrial
7	Oak Brook Mechanical	4.4 (10)	No	No	Not published	Commercial only
8	1 Source Mechanical	5.0 (1)	No	Yes	Not published	Commercial only

*Google figures verified during research.

Best Oak Brook HVAC Companies: Descriptions and Reviews

1. Four Seasons

Four Seasons has served Chicagoland homes from Bedford Park since 1971, and its 600-truck fleet reaches Oak Brook from neighboring Cook County. The company covers plumbing and electrical work in addition to heating and cooling, so one number handles the whole house.

• Verified Google Reviews: 4.7 stars, 30,700+ reviews.
• Whole-Home Service Range: Four service lines, furnaces through electrical panels.
• 24/7 Call Answering: Someone answers who can dispatch a technician at any hour.
• Years Serving Chicagoland: 55 years, since 1971.
• Residential Focus: Chicagoland and Northwest Indiana homes.

Customer Review Summary
Chicagoland homeowners consistently praise Four Seasons’ upfront quotes, calling one visit "straight to the point with full transparency of the price." Common feedback includes appreciation for tidy work, since technicians "even cleaned up and swept when they finished."

2. Air-Rite Heating & Cooling

Air-Rite has run heating and cooling work from Naperville since 1959, the longest local run here. Its technicians earn the strongest rating on this list, though a plumbing problem sends the homeowner elsewhere.

• Verified Google Reviews: 4.9 stars, 1,900+ reviews.
• Whole-Home Service Range: Heating and cooling only.
• 24/7 Call Answering: 24-hour availability on its Google profile.
• Years Serving Chicagoland: 67 years, since 1959.
• Residential Focus: DuPage County homes.

Customer Review Summary
Naperville-area homeowners consistently praise Air-Rite’s candor, describing "the most honest, professional, and caring service we have ever experienced." Common feedback includes appreciation for clear quotes, since the team "responded immediately" and stayed "up front with the cost."

3. Nortek Environmental

Nortek Environmental reaches Oak Brook from Naperville and has stayed woman-owned and family-run since 2001. Its 22-point inspection anchors a maintenance plan built around zoning dampers and control wiring, which suits multi-zone Oak Brook homes.

• Verified Google Reviews: 4.9 stars, 390+ reviews.
• Whole-Home Service Range: Heating and cooling only.
• 24/7 Call Answering: 24-hour availability on its Google profile.
• Years Serving Chicagoland: 25 years, since 2001.
• Residential Focus: 28 named suburbs.

Customer Review Summary
DuPage County customers consistently praise Nortek’s attention, writing that the company "adds a personal touch to every service call." Common feedback includes appreciation for "the honest service and fair pricing."

4. Airworks Heating, Cooling and Radiant

Airworks serves Oak Brook from Gilberts in Kane County and puts radiant heating in its own name, so hydronic floors and boilers get real depth. Owners of conventional furnaces still get service, though 46 reviews leave thin public feedback.

• Verified Google Reviews: 4.8 stars, 45+ reviews.
• Whole-Home Service Range: Heating and cooling only.
• 24/7 Call Answering: 24-hour availability on its Google profile.
• Years Serving Chicagoland: 22 years, since 2004.
• Residential Focus: 50 named municipalities.

Customer Review Summary
Northern Illinois homeowners consistently praise Airworks’ technicians, crediting "the most professional, honest, hardworking tech we have ever worked with." Common feedback includes appreciation for careful installs, since a crew "kept the area immaculately clean throughout the process."

5. Climate Change Inc.

Climate Change works in Oak Brook from Justice and has installed furnaces and ductwork across the southwest suburbs for more than 20 years. Its weekday hours end at 8 p.m., so a 2 a.m. furnace failure waits until morning.

• Verified Google Reviews: 4.7 stars, 35+ reviews.
• Whole-Home Service Range: Heating and cooling only.
• 24/7 Call Answering: No, weekday hours end at 8 p.m.
• Years Serving Chicagoland: More than 20 years.
• Residential Focus: Greater Chicagoland homes.

Customer Review Summary
Southwest suburban homeowners consistently praise Climate Change’s rates, finding "their prices are very reasonable for the quality of work they provide." Common feedback includes appreciation for quick arrivals, since a technician "came out within 2 hours of calling."

6. Geothermal Energy Solutions

Geothermal Energy Solutions designs ground-source systems from Northbrook and has finished more than 300 projects since 1998. An Oak Brook owner planning a geothermal loop gets design depth generalists rarely carry, though a January furnace failure belongs elsewhere.

• Verified Google Reviews: 4.5 stars, 2 reviews.
• Whole-Home Service Range: Heating and cooling only.
• 24/7 Call Answering: No, hours end at 5 p.m.
• Years Serving Chicagoland: 28 years, since 1998.
• Residential Focus: Homes and commercial properties.

Customer Review Summary
Two published reviews carry all the public feedback here. One owner reported that "the heating and cooling system is quiet and efficient," and added that "every step of the process was completed in a professional and efficient manner."

7. Oak Brook Mechanical Services

Oak Brook Mechanical Services runs from Route 83 in Elmhurst and maintains heating systems for commercial properties. Its name matches the search, though a homeowner hunting furnace repair will find the focus sits on buildings.

• Verified Google Reviews: 4.4 stars, 10 reviews.
• Whole-Home Service Range: Heating and cooling only.
• 24/7 Call Answering: No published after-hours line.
• Residential Focus: Commercial properties.

Customer Review Summary
Building owners consistently praise the follow-through, writing, "Thank you for being reliable, efficient and honest!" Common feedback credits the crews, with one customer noting, "This company has top-shelf installers and stands behind their work."

8. 1 Source Mechanical

1 Source Mechanical staffs an Oak Brook office on Jorie Boulevard from its DeKalb County headquarters and handles rooftop units and building automation. Its hours end at 4 p.m., and one Google review leaves little to judge.

• Verified Google Reviews: 5.0 stars, 1 review.
• Whole-Home Service Range: Heating and cooling only.
• 24/7 Call Answering: Published 24/7 emergency line for commercial clients.
• Years Serving Chicagoland: Not published.
• Residential Focus: Commercial buildings.

Customer Review Summary
One published review contains all public feedback. That customer wrote that the technician "had a great attitude at 7:30 a.m., did his job thoroughly and explained everything to me."

Top Oak Brook HVAC Companies for Ductless Mini Split Installation

Rank	Company
1	Four Seasons
2	Airworks Radiant
3	Air-Rite Heating & Cooling
4	Nortek Environmental

Top Oak Brook HVAC Companies for Commercial Rooftop Units

Rank	Company
1	1 Source Mechanical
2	Four Seasons
3	Oak Brook Mechanical
4	Nortek Environmental

For a PDF copy of this report, contact the team online.

Oak Brook homeowners weighing a repair against a replacement can schedule a visit with Four Seasons at (866) 444-2404 and hear every option priced before work starts.