Plumbing Heating and Air Conditioning in Montgomery

Plumbing Contractors

Woman Owned and Operated

Providing Contracting Services
to The Chicagoland Area

Est. 1926

Tradition & Innovation

Why R.J. O'Neil
Is Right For You

Established in 1926, R.J. O’Neil has a strong sense of pride that characterizes our company. We have built a solid reputation as a high-quality service-oriented firm with a can-do team-oriented attitude. We work diligently to improve our products, processes, and services every day.

We provide quality HVAC-R, plumbing, and mechanical services to the municipal, industrial, commercial, and residential markets. Our can-do attitude, long history of service, and proven process for customer satisfaction builds lasting relationships with our clients, making R.J. O’Neil an unparalleled choice for all of your mechanical services.

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Our Partners & Affiliations

What We Offer

Plumbing Services

Backed by a team of trained mechanical technicians, we have the skills & resources to handle everyday commercial projects or emergencies, as well as any unique industrial process piping systems.

Quality Plumbing Services

Since 1926
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HVAC-R Services

From industrial high-pressure steam boilers, to walk in freezers, we provide the commercial heating & air equipment. Including piping, ductwork, and the expertise to service and install your system.

Trained technicians. Exceptional service.

Since 1926
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Maintenance Packages

R.J. O’Neil offers completely comprehensive commercial or industrial maintenance programs. All with the goal of assisting in keeping all of your equipment running both safely and efficiently.

Save Time and Money

Since 1926
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Mechanical Construction

R.J. O’Neil employs skilled tradesmen who possess knowledge in a variety of disciplines and are capable of affecting repairs, replacements, retrofit adaptions, and installation of every component needed.

Trained professionals who take your project seriously

Since 1926
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Plumbing & Piping Services

Backed by a team of trained mechanical technicians, we have the skills & resources to handle everyday commercial projects or emergencies, as well as any unique industrial process piping systems.

Quality Plumbing Services

Since 1926
Learn More

HVAC-R Services

From industrial high-pressure steam boilers, to walk in freezers, we provide the commercial heating & air equipment. Including piping, ductwork, and the expertise to service and install your system.

Trained technicians. Exceptional service.

Since 1926
Learn More

Maintenance Packages

R.J. O’Neil offers completely comprehensive commercial or industrial maintenance programs. All with the goal of assisting in keeping all of your equipment running both safely and efficiently.

Save Time and Money

Since 1926
Learn More

Mechanical Construction

R.J. O’Neil employs skilled tradesmen who possess knowledge in a variety of disciplines and are capable of affecting repairs, replacements, retrofit adaptions, and installation of every component needed.

Trained professionals who take your project seriously

Since 1926
Learn More

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.
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Chicagoland contractor

Who We Serve

R.J. O’Neil is a mechanical contractor that has been serving the Chicagoland area for four generations. The company was established in 1926 and has since then gained a reputation for being a reliable and professional contractor. R.J. O’Neil specializes in quality workmanship and takes pride in its long-running history of providing skilled services to its clients. The company’s markets include residential, commercial, industrial, and municipal projects. R.J. O’Neil is dedicated to providing its clients with the best possible service and strives to be the leading contractor in the Chicagoland area.

About R.J. O'Neil

A full-service mechanical contracting firm, R.J. O’Neil specializes in process piping, plumbing, heating, air conditioning, and refrigeration. Offering complete mechanical services including systems design and layout, installation, maintenance and emergency repair. We also offer comprehensive maintenance programs for our commercial and industrial customers.

Great Service Starts With Great People

Join Our Team

R.J. O’Neil strives to continue to build a culture rooted in team-oriented collaboration and can-do attitudes. It is these core values that lay the groundwork for a level of professionalism and excellence that consistently exceeds our customer’s high expectations.