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R.J. O'Neil Inc. Mechanical Contractors

Montgomery, IL
4.7(50 reviews)
RESPONSE

Unknown

No response data yet

EMERGENCY

Claims 24/7

Self-reported — not confirmed by reviews

PRICING

Unknown

Based on review analysis

RED FLAGS

None Found ✓

No significant concerns in reviews

Trust Score: 72/100 · Based on 50 reviews

AvoidAvoid
4.7Google

Our Verdict

Not Recommended

#1 of 5 in Montgomery, IL

Best for

No standout specialties

Avoid if
  • You're highly price-sensitive
  • You need this for a complex or high-stakes install

Hire if: You need a plumber who actually shows up when scheduled

Hire if: You need transparent, predictable pricing with no surprise fees

Caution if: You want detailed upfront explanations

Caution if: You need airtight scheduling and guaranteed arrival times

Caution if: You need rock-bottom prices with zero flexibility on the quote

How they score across what matters

Based on 0 reviews analyzed. Click a row for the quote that best illustrates the score.

What they do well (and don’t)

Green means reviews confirm they’re good at it. Red means reviewers flag issues. Gray means no reviews talk about it yet.

What 50 Reviews Tell Us

Emergency Response

No reviewers specifically mention emergency response times

What To Watch Out For

Not enough data to identify weaknesses

Customer reviews

Recent Google reviews

H
Hi5 Vacations
8 months ago

I’ve been using this company for over 11 years, and they continue to exceed my expectations every single time! Recently, our AC stopped working, and they sent a technician out right away. He was incredibly knowledgeable—after I explained the issue, he immediately diagnosed the problem and even made an extra trip to pick up the replacement part to get us up and running the same day. This is a woman-owned business run by hardworking people who truly treat their customers and employees like family. Their service is always superior, and their prices are very reasonable. It’s rare to find a company that cares this much and delivers such consistent quality. Highly recommend them to anyone looking for honest, dependable HVAC service!

J
Jon Dow
8 months ago

As a small business owner, I strongly caution others against using this HVAC/R company. In my 10+ years of small business ownership, they are by far the least trustworthy and poorest performing contractor I have ever used. Our experience with them was nothing short of a disaster. We trusted them with all our HVAC and refrigeration needs and were met with poor service, a defensive attitude, and zero accountability. When problems arose (and there were many), they were quick to argue and slow to act. They raised our service rate by 25% over the course of a year without notifying us. When I asked about it via email—no response. I also requested multiple quotes that never showed up. As a business owner, I don’t have time to chase vendors just to pay them. We caught them billing us for work that was clearly not performed. On two separate occasions I verified this—one required a third-party HVAC company to inspect and confirm, with photos, that the rooftop unit had not been cleaned or serviced as billed. Even when caught with proof, they were completely deflective on the issue. After waiting almost 2 months for a return visit to correct this PM (and them continually rescheduling) – we gave up and had to hire a new company to do the work. Their refrigeration services were even worse. They mis-sized a walk-in freezer system – which we purchased and were forced to replace - because they used incorrect measurements and passed the load calculations off to their supply warehouse. When I showed them manufacturer-provided calculations that proved the system was undersized, they did nothing but argue. No ownership. No fix. Just more excuses. Hilariously, they also bid to replace the walk in freezer / cooler and the measurement was completely wrong. If I would have used them – they would have showed up with a cooler/freezer that would not have fit the space. Inability to properly use a tape measure, I’m sure that would have been turned around on me and become my fault too. The most frustrating part of all this has been their attitude—always defensive, never apologetic, and absolutely no sense of customer care or professionalism. Bottom line: If something goes wrong (and it likely will), this company will not stand behind their work. Do yourself a favor—look elsewhere. You deserve a company that values your time, your business, and does the job right. Attached are photos right after a “PM” on our roof top units.

J
Jennifer McSkimming
3 months ago

I used RJ O'Neil for the first time and was beyond impressed! I was given options of furnace repair, replacement and furnace and a/c replacement. As a woman it is an intimidating process to have home repairs/replacement done, but RJ O'Neil made it such an easy process. I appreciate their professionalism, expertise and how respectfully they treated me. I am very happy with my new furnace & AC, I would highly recommend RJ O'Neil!!

L
Lou Rivera-Hill
7 months ago

R. J. O’Neil handled the removal and installation of our heating and AC system today. The response to our need was quick, starting with the estimate, then proposal/invoice and finally the installation. The installers were prompt and professional and work was done in a timely fashion. They went above and beyond when connecting to the existing duct work and the clean up. We highly recommend R. J. O’Neil for all your mechanical, HVAC and plumbing contractor work, both residential and commercial. Five star business for sure!

J
Josh Kutzke
6 months ago

We can’t thank RJ O’Neil enough! Our AC went out in the middle of a heat wave, and with a newborn at home we were really worried. They responded immediately, showed up quickly, and had our unit fixed the same day. The technician was professional, efficient and personable. Having cool air back so fast was such a relief for our family (especially for the newborn and dog!). Highly recommend RJ O’Neil for anyone looking for reliable and caring HVAC service!

Business details

Phone
(630) 906-1300
Address
1125 S Lake St, Montgomery, IL 60538, USA
Hours
Open 24 hours

Service area

Based in Montgomery. Serves 28 nearby cities within 20 miles:

Last updated June 25, 2026 · Data from Google Reviews
72

R.J. O'Neil Inc. Mechanical Contractors

4.7
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