Abacus
Company Overview
?New Yelp customers receive a waived dispatch fee? Schedule online with ease? Top-tier Better Business Bureau rating.
Abacus Plumbing was established by Master Plumber Alan O'Neill in 2003 with a singular aim: to build lasting relationships via outstanding customer care. Thanks to a customer-first philosophy, Abacus Plumbing has emerged as one of Houston's leading companies and has gained a solid reputation nationwide.
In February 2012, Abacus expanded its offerings to include Air Conditioning & Heating services. In its first year, the Air Conditioning & Heating services catered to clients in 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 thrive and excel in the HVAC and Electrical sectors. Residents of Houston need only contact one company for comprehensive plumbing, HVAC, and Electrical services.
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
Since 1977, Alan has been involved in the plumbing industry. Starting as a plumbing apprentice in his hometown of Dublin, Ireland. Alan is a licensed Texas Master Plumber. Alan is married to Linda and is a father of three. 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

If I could give a zero I would. The technician came to diagnose the problem with my air conditioner and they told me it will cost 500 dollars. No other options
What was very upsetting is that the technician spent about 45 minutes telling me how bad home warranties are and that they will not fix the problem and will tell me that I will need to replace the whole unit.
I called my home warranty and they sent in on the same day a technician that diagnosed the problem and fixed it. They said it was totally different problem and I paid only 65 dollars.
DONT USE THEM

The technician quoted me $260+ to unclog the AC drain. He made it sound like our roof is about to be flooded and he needs to cut the pipe to flush it off. I declined the service and he got upset. He said "You think you can claim this from your home insurance?", and he laughed. I poured Drain-O into the pipe and it was unclogged.

These guys sold me over $8000 worth of air conditioning replacement and fixes to install a new AC unit, reduce humidity, and correct airflow between rooms of my house. Looks like they sold me a unit that was too small for my house (I had no idea) and did not reduce humidity at all inside. Now I cannot get someone on the phone that will do anything. Buyer beware. I've been conned and I hope you will be victimized by this company.

I experienced problems with my water filtration system that Abacus installed 4 years ago. I noticed the problem on a Saturday morning. System was regenerating (flowing water full stream) but didn't stop regenerating due to malfunction for an undetermined amount of time. Called that morning and they sent a plumber within an hour. He bypassed system, tweaked existing system and seemed ok. Five days later, Wednesday, got a call from the Water Dept notifying me of an unusually high usage of water...11,000 gallons (due to malfunction). Friday, I had no running water in my house. Checked the water filtration system again. It was trickling water so I bypassed the system and was able to get running water in the house. Called Abacus on that day and left a message. Didn't get a call back Friday or Saturday. I had to call back on Monday. They did schedule a plumber for the next day but I was unavailable. Plumber came out the next morning, ordered new parts (thankfully under warranty) and installed new parts within hours. Other than the non-response from my messages, eventually, they came through and I do appreciate their efforts to make things right. It would have been nice to know, at installation, that parts may need replacing in 4 to 5 years. Otherwise, I do appreciate their response time and fixing the problem. 4 stars given because I see an improvement in their efforts to address issues.

I called on a Saturday at noon when my air conditioning unit stopped cooling. I was given a 3 to 6 PM window for my repair team to arrive. Doug and Michael arrived at 3 PM. Within 20 minutes they had diagnosed and repaired the problem (a corroded connecter). I was not charged extra for a weekend visit. In fact I was given a 10% discount as a member of the Abacus service network. This is simply the best company in Houston.

Don't waste your time or money with these guys. You will likely waste a lot of just time waiting for a technician for your scheduled appointment only to have to reschedule again and again because they can't seem to figure out how to show up on time. Also, they seem to have gotten too big for themselves are the departments are very siloed such that no one seems to know much. I am canceling my membership and going back to the small business who has more reliable and better customer service.

Called for an appointment at 3:00pm on Sunday, was told of the additional charges for the holiday weekend. Telephone sales agent told me it would be after 6pm before service tech would be out. I had family over for barbeque and needed to clean up. Called back at 7:30pm for update, told we were second stop for tech, did not hear from anyone until 11:30pm ( still not there) Told whoever was on the line to forget it. NEVER EVER AGAIN!!!

Had a very small leak in a copper line. Same issue I've dealt with 5-6 times in several houses in the last 10 years. Usually costs less than $300 to fix. Abacus charged us $780. Job took about an hour. Called them to ask why it was 3X more expensive than everyone else. They couldn't give me an answer but said they would refund the $122 they charged to cut a hole in the Drywall. I wasn't aware until now that anyone was worse than John Moore.

Three hour appointment as a club member and they were a no show. They used to be good, few years ago, but no longer.

My AC wasn't working, condenser coils had froze and the blower motor was out. A technician/salesman was sent to me and explained that I would need to pay 500-600 for a new blower motor (when really it just needed a new capacitor and began to work just fine). Since my system is older he then explained I would be better off getting a whole new AC system. I took the quote and thanked him and called another individual with Sanders service solutions. Thank goodness an actual installer (not salesman) was sent who had real knowledge and changed the capacitor. My home is now cooling and I'm not out a whole bunch of paychecks and my sanity. I understand companies wanting to make a buck but not at the expense of people in need during tough situations. The 10 year part and labor warranty did sound pretty good if I had to get a new system but 11K wasn't gon' happen. Glad I didn't sell soul away.