Business Details
50+ Years
experience
Emergency
services
Your Trusted Partner for HVAC & Plumbing Services
Established in 1926, R J O'Neil has built a legacy of excellence in mechanical services through unwavering commitment to quality and customer satisfaction. Our team specializes in HVAC-R, plumbing, and pipefitting solutions for municipal, industrial, commercial, and residential sectors, combining decades of expertise with a personalized approach. We prioritize safety, innovation, and long-term partnerships, ensuring systems operate efficiently while maintaining a 100% on-time completion record. As a certified woman-owned and minority-owned business, we emphasize equity and community impact. Our end-to-end services span installation, maintenance, and emergency response, supported by a dedicated project management team.With roots tracing back to the American railroad industry, our family-owned values drive every project. We serve Chicagoland with 24/7 emergency capabilities and a focus on sustainable outcomes. Our certifications include MBE, WBE, and WBENC recognition. By fostering a positive work culture, we ensure employees prioritize client needs while maintaining work-life balance. This philosophy has earned us 95% repeat client retention and a reputation as a trusted mechanical contractor.
Services
HVAC-R
Plumbing
Pipefitting
Maintenance Packages
Emergency Services
Details
- Year established: 1926
Highlights and features
- We maintain a 100% on-time project completion record since 1926
- Certified woman-owned and minority-owned business in Illinois and Chicago
- 24/7 emergency service with rapid response capabilities
- Decades of experience in HVAC-R, plumbing, and industrial pipefitting
- Single project manager oversight from start to finish
Associations and certifications
- Minority-Owned Business Enterprise (MBE)
- Woman-Owned Enterprise (WBE)
- Womens Business Enterprise National Council (WBENC)
- Small Business Enterprise (SBE)
What people say
24/7 emergency response
Technical expertise
Long-term partnerships
Prompt problem-solving
Professional team
Services
HVAC-R
Our HVAC-R division provides comprehensive heating, ventilation, air conditioning, and refrigeration solutions for commercial and industrial clients. With specialized expertise in rooftop units, chillers, and commercial refrigeration systems, we ensure optimal climate control and energy efficiency. Our authorized Luxaire dealer status guarantees access to premium equipment backed by expert installation and maintenance services.
Plumbing
From emergency repairs to new installations, our plumbing services cover residential and commercial needs including water heaters, sewer systems, and gas piping. Licensed and insured technicians utilize jet rodding and camera inspection technology to diagnose and resolve issues efficiently while maintaining code compliance and safety standards.
Pipefitting
We design and install precision piping systems for industrial applications, including fabrication, welding, and emergency response. Our team handles complex projects requiring specialized materials and configurations, ensuring leak-free performance in demanding environments like manufacturing plants and wastewater treatment facilities.
Maintenance Packages
Customized maintenance contracts prevent system failures through regular inspections and proactive repairs. Our technicians monitor HVAC, plumbing, and mechanical systems to identify potential issues before they cause downtime, extending equipment lifespan while maintaining operational efficiency for businesses.
Emergency Services
Critical mechanical failures demand immediate attention. Our 24/7 emergency team responds promptly to urgent HVAC, plumbing, and pipefitting issues, providing after-hours service with full access to equipment and resources needed to restore operations safely and efficiently.
Questions
What areas do you service?
We serve the entire Chicagoland area including Montgomery, Aurora, Naperville, and surrounding communities for all mechanical service needs.
Are you available for emergency repairs?
Yes, our 24/7 emergency service responds to HVAC, plumbing, and pipefitting crises at any hour with rapid on-site support.
What certifications do you hold?
We're certified as a Minority-Owned Business Enterprise (MBE), Woman-Owned Enterprise (WBE), and WBENC-accredited contractor in Illinois.
What industries do you serve?
We support healthcare facilities, educational institutions, industrial plants, commercial offices, and government buildings with specialized mechanical solutions.
Reviews (4)
Sandi S.
Nov 11, 2021
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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
Oct 03, 2021
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Positive:Professionalism,Punctuality,Quality,Responsiveness,Value
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.
Service:Ductless heating and AC services
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.
Service:Ductless heating and AC services
Ravi Vaghani
Dec 01, 2020
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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.
Manny'S. Food Ventures
Nov 19, 2020
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As a new small business owner, I was working with a deadline to get our business up and running. During this COVID 19 scare, an hvac contractor I paid to finish job, refused to finish a job he was paid in full to complete. I know I know , never pay in full until the job is done. I called and spoke to Jessica. Jessica noticed I was upset and freaking out a bit. She calmed me down and had Levi out in two days to help get our cooler going. They showed up when they were supposed to and Levi was amazing. Thanks guys. I'll be using R.J. O'Neil in the future.
