Abacus
Company Overview
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Abacus Plumbing was established by Master Plumber Alan O'Neill in 2003 with a singular aim: to create lifelong customers through exceptional service. With a focus on putting customers first, Abacus Plumbing has risen to prominence in Houston and has gained respect across the country.
In February 2012, Abacus expanded its offerings to include Air Conditioning & Heating services. During its inaugural year, the Air Conditioning & Heating division served customers throughout Houston.
Abacus expanded its service range with the addition of Electrical services in September 2014.
The company has exceeded its goals by delivering exceptional, client-centered service and continues to advance and lead in the HVAC and Electrical industries. Houston customers can count on a single provider for their plumbing, HVAC, and Electrical needs.
Quote from Tom Tynan: ""I've known Alan O'Neill for over 20 years, and his company, Abacus, stands out above all other plumbing firms in Houston
Alan has been part of the plumbing trade since 1977. He began as an apprentice plumber in Dublin, Ireland. Alan is a licensed Texas Master Plumber. Alan shares his life with Linda and their three kids. In his leisure time, Alan enjoys family outings and is a certified scuba diver.
Alan states, “The tranquility of the underwater world offers a peaceful break from the fast pace of everyday life” Alan enjoys watching Houston's sports teams, especially the Houston Dynamo.
Business Services
- Bathtub installation
- Bathtub repair
- Circuit breaker installation
- Circuit breaker repair
- Drain installation
- Drain repair
- Electric inspection
- Electric installation or replacement
- Electric panel installation
- Electric panel repair
- Electric repair
- Wire installation
- Wire repair
- Electric vehicle charging station installation
- Faucet installation
- Faucet repair
- Garbage disposal repair
- Gas line installation
- Gas line repair
- Generator installation
- Generator repair
- HVAC installation or replacement
- HVAC system repair
- HVAC system maintenance
- Light fixture installation
- Light fixture repair
- Outlet installation
- Outlet repair
- Plumbing inspection
- Plumbing installation or replacement
- Plumbing repair
- Sewer installation
- Sewer repair
- Shower installation
- Shower repair
- Sink installation
- Sink repair
- Toilet installation
- Toilet repair
- Water heater installation
- Water heater repair
- Water pipe installation
- Water pipe repair
Business Location & Hours
Mon: | Open 24 hours |
Tue: | Open 24 hours |
Wed: | Open 24 hours |
Thu: | Open 24 hours |
Fri: | Open 24 hours |
Sat: | Open 24 hours |
Sun: | Open 24 hours |
Recommended Customer Reviews

This review is specifically for their a/c department. DO NOT EVER HIRE THEM FOR A/C!!! Don't do it... I lost hundreds of dollars to them over a/c repairs and all they did was turn the unit back on, tell me they didn't know what was wrong than tried to say I needed to spend thousands on a new air exchange "because the drain pipe was too small"... It's a complete scam. The volume of condensation required to overflow a clear 1/2" pvc pipe would be truly phenomenal. The air exchange doesn't even effect the drain pipe size... Do you know what I actually needed to fix my a/c? A cup of bleach, $5 of pvc, and ten minutes in my attic installing a vent and cleanout for the drain pipe. That's all... I haven't had any issues with my unit since I personally fixed it. These guys are running some kind of scam through their a/c department. I would go so far as to say that I can't trust any part of their business, you shouldn't either.

Joe was a great technician. The only reason I didn't mark five stars was do to the company. After waiting until 5pm for an appointment scheduled for 8-11am, I was very frustrated with Abacus. Joe accepted my ticket and traveled from SE Houston to Sugar Land. He was very professional and thorough. He explained everything he did, found the issue and attempted several times to get a final resolution to my problem that was covered under warranty. Joe went the extra mile for me. He could have easily just left and said someone would contact me as I believed most would have done. He knew my frustration from waiting all day and did all he could to take care of my issue.

Had a failing garbage disposal on my outdoor kitchen sink. Found Abacus from Home Advisers. This company was on it.
The company dispatchers kept us updated on the Technician arrival time - they called us a couple of times. That was impressive in itself.
Josef Moran arrived to our house to fix the garbage disposal in our outdoor kitchen. He went down and hit a reset button hidden away and it started working immediately.
This was 6:30 in the evening and he No Charged the visit since it was so quick. Josef single highhandedly gave me a feeling of instant credibility for Abacus. His attitude was awesome. He said he is the after-hour guy and loves to work. As a business owner myself, I would only tell Abacus to hold onto this guy. He is representing Abacus well.
There is no doubt that we will be calling Abacus again. I highly recommend them.

My sister flooded in Atascocita subdivision in Humble TX. in short, we thought we had an electrical short, Abacas came out and checked it out. We were told no problem, and no charge. Great people in a time of need.

Professional plumber showed up in uniform. Wore little booties to keep my floors clean. Arrived within the window of the appointment. Gave us three options on a fix for our AC drain clog. And then spent the next 90 minutes fixing and double checking the fix and triple checking the fix to make sure the clog was gone and the leak stopped.
I was very impressed that his truck came complete with everything he needed to fix my issue on the first trip. No running to the supply store or calling another plumber to bring him stuff.
Like most folks we tried all the home remedies YouTube suggested! Then we gave up and called a company that advertised on the radio station where I work.
I have done everything I can to stay away from the "chain/big boy" plumbers. They all seem to want nothing more than to sell me something, sign me up for their semi-annual inspection clubs and over charge me.
Having said that, I called Abacus and got a plumber out in just 2 days...right after Harvey. It was not an emergency fix...so I can't speak on how fast they do those. But it was 2 days after Harvey hit! I left a message on their website on a Sunday morning not expecting to hear back from anyone for a while. Within an hour a lady called to hook me up. I got a text when the plumber was on his way - with his name and photo! No question that he was our guy when I answered the door.
They charge a service fee of $50 to come out. That tells me they aren't there to "sell" me something but to actually fix the problem. They accept credit cards. I will call them again.

I always trust Abacus for my plumbing needs. You really can rely on them for fast, professional service. They're punctual & prepared for just about any job. Peace of mind is worth every penny. Ask for Jarrod & you won't be disappointed. He came by for a simple installation job & was friendly & professional. He worked quickly while paying close attention to detail. Very happy with the work! Abacus always gets 5 stars because their employees are 5 star employees!

So far this is the best AC contractor I found in Houston area. knowledge, experience, professionalism and work ethics, next to none. HIghly recommend them!

Abacus dispatched Bryan Haygood for my garage door electrical problem. Bryan diagnosed the problem and completed the repair within one minute.

I should have read reviews first instead of trusting Tom Tynan sponsor. This company is at least double the cost of regular plumbers and he could not fix a pvc pipe leak under my kitchen sink. I will never use them again nor will I use a Tom Tynan show sponsor.

I have had Abacus out to the house on 3 occasions. Each time work performance of the technicians has been stellar. I had a lot of electrical problems in the house, that Cesar corrected working tirelessly for 3 straight days. I am very satisfied that all the Abacus techs that I have had out to the house go the extra mile to do things right, Thanks to Cesar, Sebastian & Manny.