Abacus
Company Overview
?Dispatch fees are eliminated for first-time Yelp clients? Convenient online booking available? BBB A+ accreditation.
Abacus Plumbing was established by Master Plumber Alan O'Neill in 2003 with a singular aim: to build lasting relationships via outstanding customer care. Due to its commitment to customer satisfaction, Abacus Plumbing has become a top player in Houston and has gained a solid reputation nationwide.
In February 2012, the company added Air Conditioning & Heating to its lineup. During its inaugural year, the Air Conditioning & Heating division served customers throughout Houston.
In September 2014, Abacus broadened its scope by adding Electrical services.
The company has exceeded its goals by delivering exceptional, client-centered service and continues to thrive and excel in the HVAC and Electrical sectors. Houston customers can count on a single provider for their plumbing, HVAC, and Electrical needs.
Tom Tynan states: ""For more than two decades, I've known Alan O'Neill, and Abacus is far superior to any other plumbing business in Houston
Since 1977, Alan has been involved in the plumbing industry. Alan's journey started as a plumbing apprentice in Dublin, Ireland. He holds a Master Plumbers License in Texas. He is married to Linda and has three children. Alan loves spending time with his family and is a certified scuba diver.
“The calm and serenity of the underwater realm provide a refreshing escape from the daily grind,” says Alan He also takes pleasure in following Houston's sports teams, particularly 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

Total scam. Came home to a gas leak on a Sunday afternoon. Dispatch says there is no charge for a service call, and I will get an estimate before any work is done. Tech shows up without a gas leak detector and wants to charge $1,300 to look for the leak!
They could have told me that over the phone. I would have called someone else. By not telling me, they created a situation where now I have no other option to fix it tonight. I told the tech to leave.
We will have a cold night tonight and a cold shower in the morning. But our regular, honest plumber will be here tomorrow to fix the problem. Never use Abacus, even if you are desperate. They will fleece you.

Awful company. We bought a Lennox 20 seer unit from them and nothing but issues. First Jeremy of the company claimed it would cool at the rooms within 1 degree difference. NOPE. My bedroom is 81-84F while the kitchen and living room are at 75F. No matter how many times Abacus comes out they don't care. They haven't bothered to install an another vent or another line or any type or fix. Instead they scheduled for a pipe cleaning tomorrow. Abacus doesn't care that I work night shift and will lose yet more sleep again Tuesday and I bet Wednesday too since they love to send out people to "assess the situation". This isn't even our first issue, the first issue was the unit was as loud as a Jet when it ran. Abacus fixed that citing the project manager Jeremy didn't leave notes that we needed a larger intake even though it's standard to upgrade the intake for a four ton 20 seer Lennox system. Issue after issue with Abacus and I still get to sleep in heat at night. Awful company, buyer beware. They'll make promises and not deliver. They'll waste your time with recurring "maintenance" visits instead of actually resolving anything. Hope this company gets sued. Horrid. Waste of money, my previous unit cooled better than this.

This is one of those times I wish I had looked at the yelp reviews before calling Abacus. Avoid them at all costs as they are scam / ripoff artists. I had used them before and I was satisfied with the work they did if not the price. This Time I needed a light switch replaced, a simple job, I thought, so since there was 2 of them in the same switch cover I thought I would replace both of them. He had an estimate of $235 to replace one, which included the trip to evaluate (usually $150) which I can understand, but for 2 he just doubled the price. $470 to replace 2 light switches. that is a rip-off. I will look elsewhere when I need services.

Chester Grimes arrived and gave estimate, timely and professional. Gave us several options for installation. Jose Amieva arrived following day to install hot water heater. Not an easy install, as it was in the attic. Jose and helper Jessie (?) were professional and punctual. Great job and I highly recommend Abacus.

I bought a microwave to be installed over range there was no outlet got the microwave, so Icalled Abacus to do the electrical work. no price given over phone and had to wait until electrician came todothe job. After waiting for him to make up his mind he told me $808.00with a prior $50.00 discount.This amount was just for putting in an outlet, removing a vent fan . i should have read comments before hiring him. Never again will I call on this company.

This is something I witnessed with my own eyes, and if you are a Green person or care about the environment you might think twice about using Abacus A/C services. They were at my neighbors house, the guy was in an Abacus truck and uniform!!! All of the sudden the BIG loud noise and big white cloud that released into the sky lasted about 20 minutes!!! I had to yell at him because it was so loud!!! He had cut the copper line with a hacksaw and released all the refrigerant ( freon 22 ) into the air!!! He told me that the A/C unit had blown up!!! I guess he thought I was real dumb!! I looked through the fence and could see where he cut the copper line! FYI

These guys are very dishonest. I called them out to simply tape two 8" ducts back together that had come apart in the attic. I was out of town when they came out to the house. My pregnant wife was home alone and concerned the AC might go out. The service member tried to charge her $750 for the duct work, then tried to sell her a $35 capacitor for $450. My wife didn't know the extent of the work that needed to be done. She called me when he gave her the quote of $1200 and I asked to speak to technician for clarification. He was clearly taken aback when I asked specific questions. I asked what materials and labor time is needed to tape the duct back together. He knew the gig was up. He tried to use fancy words for duct tape and zip ties. The capacitor was fine, just slightly low capacitance. I replaced it in 15 minutes for $35. I ended up zip tying and taping the duct back together in 30 minutes. Please avoid these guys.

I am very disappointed in this business. I had an issue with my A/C unit not pushing out cold air. We had a technician come out and inspect the unit. He informed us the Compressor was bad, and it would be cheaper to get a whole new unit. I asked if it was the capacitor, and he said the capacitor was not the issue. He didn't even check the capacitor.
The man then quoted me $9,600 for a new unit but had a 10-year warranty on it. I told him I would have to think about it, in which he said, "I'm not your financial advisor, but you'll need a new unit soon". He then charged me $199 for the diagnostic, even though I told him I was a veteran.
I called an army buddy of mine who was HVAC certified as well. He informed me my Compressor was fine, but my capacitor was dead. He then replaced it without issue, and now my family saved over 9000.
I am disappointed that this business would take advantage of a veteran and his family, especially in these hard times. I pray that no other family is taken advantage of by this company, who's main focus is to sell A/C Units and not repair them.
I even looked up the same unit that was quoted and found it to be around $2300. Unless labor is $7000, this company is taking advantage of people. My only regret is that I cannot give it a zero star.
Abacus, shame on you. Shame on you for taking advantage of people in this heat. Shame on you trying to sell me a whole unit when it wasn't needed. Shame on you for charging me $200 for a diagnostic. I hope you change your business model and think of the people you serve.

I had Jonathan, a technical, go to my elderly father's home to check his disposal that my father thought was not working. He arrived on time and found a seed in the disposal that was causing it not to work. We were not charged one penny. I appreciate the honesty and the kindness that was offered; in addition to not charging a service fee. I will definitely use them again and highly recommend them.

These people came out to help me with an emergency some years ago when my water heater tank ruptured. They told me there was only one option they could offer me - an expensive tankless. I did not want it, but I felt pressured by the emergency situation.
I found out some time later that they sold me a commercial grade tankless heater that was well beyond what I needed for a private home.
They also came out to give my plumbing an annual inspection, and in the process, one of their technicians broke the hot water valve under one sink. They said nothing about this to me at the time and did not offer to fix it.
I since cancelled all business with them, but they continue to send me mail-in advertisements. I have called them several times over the past months asking them to stop sending these, but they will not.
This is a company with a very aggressive policy that will take advantage of your situation or lack of knowledge to up-sell you and have tests run that are not needed. Do not use them.