Plumbing Heating and Air Conditioning in Montgomery


The Best HVAC Company
Serving The Chicago Area

Est. 1926

Keeping Your HVAC Systems Healthy

R.J. O’Neil is a company that provides HVAC services to the Chicagoland area. HVAC-R stands for heating, ventilation, air conditioning, and refrigeration. These services are important because they help to keep your home or office comfortable year-round. The ventilation system helps to circulate air throughout your home or office, and it also helps to remove pollutants and improve indoor air quality. R.J. O’Neil has a team of skilled technicians who can help you with all of your HVAC needs. Whether you need a new installation or a routine maintenance check, we can help you get the job done right!

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Services At A Glance

What Our Customers Think

Julie Jones
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We have been using RJ O'Neil for years. Not only for home but also for business. First off I would like to comment on their vast knowledge, reliability and complete professionalism but equally as important are the people who work for this company. They are trustworthy, respectful, personable and just flat out good people. The response time is great and are very conscientious about cleaning up when they are done. We are a fan if you can't tell....... we highly recommend them
Sandi S.
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I was having drainage issues in several parts of my house. The tech repair man walked through my house and patiently listened to everything. He ended up recommending that I have my bathroom rodded out however he could have sold me additional services but told me they were not necessary. He was here and done in less than 60 minutes.
Cynthia Kaplanis
Ductless heating & A/C services
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Our air conditioner went out on a very hot morning. We call R.J. O'neil and they were at our house within 1 hour . The service was amazing. We will always use them when in need.
Kathy Garazin
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Arden from R.J. O'Neil came out to our commercial building on Christmas Eve on a quasi-emergency basis to turn off our water and blow out the pipes. And then Alex came out the Sunday after Christmas to get our HVAC units up and running again. Jessica in the office helped coordinate Alex being on standby on Sunday. We truly appreciate all of their assistance and the work they did for us. I would not hesitate to recommend them - they're awesome!
Justin Soofi
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Excellent communication (both via phone and email) and customer service from the first contact through completion. I was having a lot of trouble finding a company that could handle the install of my tankless water heater in a timely manner and they fit me in promptly. Quoted a rough estimate over the phone after hearing all the details and were very competitively priced. Actual job charges were in line with that estimate, which to me is commendable. Very professional on site and the work was done quickly and with care. Would definitely recommend.
Ravi Vaghani
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My furnace stopped working on a very cold day. I called R.J.O'Neil and they sent a technician right away. The Technician was very knowledgeable and went above and beyond to resolve the issue. One part needed a replacement and Jessica worked with the manufacturer to get the part covered under warranty to save us the cost. They kept me informed through out the process and provided time line to get the part in and get it replaced. Will definitely call them with any HVAC related issues. Keep up the Great Service.

Chicagoland contractor

HVAC Services


We are a heating company serving the Chicagoland area. We offer a variety of services designed to keep your home or office comfortable all winter long. From furnaces and boilers to radiant heating and ductwork, we have the knowledge and experience to keep your space warm and cozy. We also offer preventative maintenance services to help keep your system running smoothly all season. Heating Services are important for R.J. O’Neil because without them we would not be able to properly serve our community. R.J. O’Neil is dedicated to providing the best possible service and experience to our customers and that starts with having a well-functioning heating system. Schedule a preventative maintenance appointment today and rest easy knowing your home or office will be


R.J. O’Neil provides high-quality ventilation services to home and business owners in the Chicagoland area. While most people think of ventilation as something that is only important for commercial buildings, the truth is that ventilation is just as important for homes. Poor ventilation can lead to a build-up of dust, mold, and other allergens, which can cause respiratory problems. In addition, poor ventilation can also trap heat and moisture, creating an ideal environment for pests such as cockroaches and rodents. By investing in R.J. O’Neil’s ventilation services, you can improve the air quality in your home and create a healthier environment for your family.


Air Conditioning

We provide air conditioning services in the Chicagoland area. With a variety of services, including installation, repair, and maintenance. While most people are aware of the importance of air conditioning in the summer months, R.J. O’Neil also offers services for heating and cooling in the winter. This is important because it can help to prevent your pipes from freezing and bursting. In addition, R.J. O’Neil also offers a variety of other services, including duct cleaning and energy efficiency audits. As a result, our team is a comprehensive provider of HVAC services. Whether you need installation, repair, or maintenance, we have you covered! 

Duct Cleaning

R.J. O’Neil is a leading provider of duct cleaning services. We’ve been in business for over 20 years, and our experience shows. We’re experts in HVAC-R and we know how to clean ducts so that they work efficiently and last longer. Our duct cleaning services are important for your home or business because they remove dirt, dust, and other contaminants from the air ducts. This improves the quality of the air you breathe, and it also helps to prolong the life of your HVAC system. In addition, our duct cleaning services can help to improve the efficiency of your HVAC system, saving you money on your energy bills. 


R.J. O’Neil has been Chicagoland’s premier provider of refrigeration services since 1926. We are dedicated to providing our clients with the highest quality of service and workmanship. Our team of experienced professionals are available 24 hours a day, 7 days a week to ensure that your refrigeration needs are met. R.J. O’Neil offers a wide range of refrigeration services, including system design, installation, and maintenance. We also offer emergency repair services for those times when you need us most. Whether you’re in need of a new system or simply need to have your existing system serviced, R.J. O’Neil is here to help!