Affordable Services in the
Greater Chicagoland Area
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.
HVAC-R
- Commercial Refrigeration
- Chillers
- Boilers
- Rooftop Units
- PTAC/VTAC Units
- Mini Splits
- Make Up Air Units
- Air Handlers
- Duct Cleaning
- Gas Piping Repair & Installation
- Custom Maintenance Agreements
Plumbing
- Backflow Testing & Installation
- Jet Rodding
- Sewer Camera Inspection
- Drain Rodding / Drain Cleaning
- Ejector / Sump Pumps
- Plumbing Fixture Installs
- Water Heater Repair & Installation
- Storage Tanks
- Water Main Break
- Water Piping Repair & Installation
- Custom Maintenance Agreements
Mechanical Construction
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.
Maintenance Plans
R.J. O’Neil is dedicated to serving the Chicagoland area. Our quality work ethic and long-running history of professional skill is shown throughout our four generations of family owned business.
