Plumbing Heating and Air Conditioning in Montgomery

Mechanical Construction

Industrial Servicing Tailored For Your Company

Est. 1926

The One Stop Shop For Mechanical Services

R.J. O’Neil is a professional mechanical contracting company specializing in the installation and servicing of industrial process piping, cooling towers, and other related equipment. We strive to provide our customers with the best possible service and products available on the market today. Our experienced technicians are trained to work on a variety of machinery types and brands, ensuring that your equipment is serviced properly and efficiently. In addition to our regular services, we also offer emergency servicing for those unexpected breakdowns. Whether you need routine maintenance or a one-time repair, R.J. O’Neil is here to help. Contact us today to learn more about our services or to schedule a service call.

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Our Partners & Affiliations

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

Mechanical Services

Ever striving to offer not only the best in machinery servicing, but a full suite of services to match, R.J. O’Neil provides both mechanical as well as industrial servicing for a variety of machinery types including: Boiler Units, Rooftop Equipment, Industrial Chillers, Walk-In Coolers, Cooling Towers, Industrial Freezers, And Many More!


One of our main focuses with any project is to not only meet your expectations with the quality of our craftsmanship but exceed them with each task completed, delivering a superior customer experience for each and every project that we are a part of. Installation and servicing of your mechanical and industrial units is a service we take pride in combining with our company’s widely recognized expertise.


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, from the equipment itself to the required piping and sheet metal. All the way down to the concrete pads that the equipment rests on, our experts are here to make sure your equipment is installed correctly and capable of running at peak efficiency.

Mechanical Construction