R.J. O'Neil

1125 S Lake St
Montgomery, IL, 60538
(630) 906-1300

Established in 1926, R.J. O'Neil Mechanic Contractors provides HVAC-R, plumbing, and mechanical construction.

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 build lasting relationships with our clients, making R.J. O’Neil an unparalleled choice for all of your mechanical service needs.

Main Services

  • HVAC
  • Plumbing
  • Mechanical Construction



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