R J O'Neil Montgomery IL — HVAC, Plumbing & Backflow Services

Business Overview

R J O'Neil Montgomery IL is a woman-owned, minority-owned mechanical contractor serving homes and businesses across the Fox Valley since 1926. The company provides HVAC, plumbing, backflow, and water heater services for municipal, industrial, commercial, and residential customers. Technicians are licensed and trained for installation, routine maintenance, and 24/7 emergency repairs.

Emergency service is available every day of the year. The R J O'Neil Montgomery IL team responds to burst pipes, failed furnaces on cold nights, and broken AC systems on hot summer afternoons.

Key Services

• HVAC: installation or replacement, system repair, seasonal maintenance, and commercial refrigeration.
• Plumbing: plumbing inspection, installation, and repair (sinks, toilets, tubs, showers, faucets, drains).
• Water heaters & pumps: water heater installation and repair, hot water recirculation pumps, sump pumps.
• Backflow & gas: backflow services, gas line installation and repair, sewer and water pipe work.
• Service examples: bathtub and shower installation/repair, garbage disposal and drain work, sewer installation and repair.

Areas Served

R J O'Neil serves Montgomery and nearby communities across Kane and Kendall counties. Regular service areas include Aurora, DeKalb, Oswego, Bristol, Wasco, Geneva, Yorkville, Sycamore, North Aurora, Shorewood, Little Rock, Plano, Clarendon Hills, Boulder Hill, Sandwich, Elburn, Mission, Cortland, Squaw Grove, Hinckley, Fox, Big Grove, Maple Park, and Big Rock.

Company History

Founded in 1926, R.J. O'Neil grew from a local mechanical shop into a multi-trade contractor trusted by municipalities and property owners. Over generations the firm added HVAC and refrigeration, then expanded plumbing and backflow specialties. The business holds Minority-Owned Business Enterprise (MBE) and Woman-Owned Enterprise (WBE) certifications, reflecting long-term community ties and steady, practical growth.

Leadership

The current owner began at R.J. O'Neil in 2009 and worked through a variety of roles before taking leadership. She focuses on relationship-building, staff development, and problem solving. That approach shapes day-to-day operations: technicians treat customer issues like their own, and feedback moves freely across teams. The company remains locally based and active in the community.

Specialties & Highlights

• Nearly 100 years of local service with experience across municipal, industrial, commercial, and residential projects.
• Woman-owned and minority-owned certifications that support public and private contracting needs.
• 24/7 emergency response for heating failures in cold Illinois winters and cooling issues in humid summers.
• Skilled teams for both large mechanical projects and small home repairs.

Why Locals Choose R J O'Neil

Residents and businesses hire R J O'Neil Montgomery IL for steady workmanship and a practical approach to problems. The long history, reliable emergency coverage, and trained technicians make the firm a pragmatic choice for Fox Valley properties—from older riverfront homes near the Fox River to newer subdivisions. The company emphasizes clear communication, fair repairs, and working with customers to keep systems running year-round.

For HVAC, plumbing, backflow, or water heater needs in Montgomery and surrounding towns, R J O'Neil offers experienced local service backed by decades of practice and community trust.