Abacus Plumbing, Air Conditioning & Electrical
5th year as a Best Pick
certified company
Based on 646 reviews
Our Certification Process
Best Pick Guarantee
Verified License(s)
Verified General Liability Ins.
5th year as a Best Pick Call
"You can count on us. We believe in being there for our customers, which is why our office is open seven days a week and until 8:00 PM Monday through Friday. We also provide 24/7 service to all of our customers."

Alan O'Neill | CEO
Company Information
Services Offered
Abacus offers maintenance, repair, and installation of most HVAC brands. Abacus also provides indoor air quality solutions, ductwork cleaning and replacement, attic insulation, climate zoning, radiant barriers, and Wi-Fi thermostats with an emphasis on improving system efficiency. Abacus offers a biannual HVAC service plan called BAM!
Abacus offers up to a ten-year parts-and-labor warranty on all full system installations.
Company History
Abacus was founded in 2003.
The company was awarded the Best of Readers' Choice Award by Living Magazine.
Employee Information
Employees wear uniforms, drive marked vehicles, and undergo background checks and drug testing.
Areas Served
North Houston Suburbs, Fort Bend County & Southwest Houston, West Houston Suburbs, The Heights/Midtown
A selection of 646 homeowner reviews:
“I was impressed that the technician called in his supervisor to consult on a unique problem that was not at all routine. Good teamwork—A.”
“The install crew was prompt and efficient with their time, they cleaned up very well after completing the job, and they were very professional. We're very pleased with our new heating and A/C.”
“The experience was great. I will use them again, and I will recommend Abacus if the opportunity arises—A+.”
“Outstanding in every respect—A+.”
“Great service. Not only did they check all systems to make sure they were working properly, they also cleaned things I didn't know were disgusting.”
“Never have to worry about the quality of work done.”
“I liked them. I thought they did a great job, and I'm very pleased. I would use them again. They did mostly air conditioning work and a filter, and they did some other small things for me. Also, I had an electrical part that needed work, and they did a good job. I chose them because I had heard that they were really good—I wanted someone that knew what they were doing and would do a good job. I'd grade the company as an A.”
“They seemed to know what they were doing, and that's what I liked about them. They worked on my air conditioning unit, and I'm getting ready to have some plumbing work done and probably a little bit of electrical work, too. I would give them an A.”
“I used them several times before. Their workers are very professional and knowledgeable. They show up on time, they don't try to oversell you on things that you don't need, they're realistic about what's going on, and they're very helpful. They did air conditioning repair work. They get an A rating.”
“They're very personable, and they are professional. We had them install an air conditioning and heating system in our house, and they service it two times per year, as scheduled. I think we picked them out of a Best Pick Reports book. I would grade the company as an A.”
“They're on time, and they're fine. They did the air conditioning, and they maintain it for me. Somebody told me about them, and that is how I found them. I would give them an A-.”
“I like that they're fast and usually give same-day service. They did air conditioning repair. I used them before for a different issue, too—for a prior experience. I'd grade them an A-.”
“They did what they said they were going to do. They put in an air conditioning system. They also did some plumbing work. I would recommend them to a friend. They're an A-grade company.”
“They're very thorough, and they're very straightforward in explaining things to you. A couple of times, I've had to call them back for minor issues. They replaced the furnace, they replaced my air conditioners, and they service them annually. They did both plumbing and heating and air works. They did water heaters—they changed those. I've used them for a number of years. I would definitely rate them as an A.”
“We use them for our air conditioning and for our plumbing. They're professional, and they're pretty much on time. The nice thing is that they'll keep working until they get it the right way. I chose them because of references. I'd probably give them an A-.”
“The guy from Abacus was very professional, and he got my A/C unit running. He knew his stuff backwards and forwards. I would recommend them to anyone, and if I have an issue again, I will call them over anyone else. He did a great job—A+++.”
“Abacus put in my air conditioner. They were extremely professional, and the guys were all experienced. I was very pleased with them; they did a great job. I would give them an A+ grade.”
“They're prompt and clean, and they take care of whatever you ask them to do. They did the ductwork for my air conditioning unit and heater, they replaced my air conditioner and my furnace, they completely redid all the water pipes in my house, and they put in a water filtration system. They earned an A+.”
“Abacus was quick and professional. They did plumbing and A/C work. I chose them because of their reliability—they're A+.”
“The young man that came out to fix our heating was very professional. He had the equipment on his truck to fix it, and he fixed it in no time at all. The problem was a safety feature—a fuse on the heating unit. If the furnace overheated, it would shut down. Abacus deserves an A+.”
“They did A/C work. I had a positive experience—everything was great.”
“Abacus replaced a vent motor, a blower motor, and a thermostat. It worked afterward, and I didn't have to call him back. I would give them an A.”
“Abacus did everything great. The lady on the phone was very nice, and I was impressed with the on-time arrival of the workers. They put on booties before they came in the house, and they didn't make a mess. They listened to what I had to say, and the work didn't take long at all. I'd give them an A+.”
“The people from Abacus were very professional. They installed a new heating and air conditioning system, and they also installed a new water heater. The workers were prompt and efficient. They've earned an A.”
“Abacus was very quick to get out here and get the job done. They changed out a circuit and fixed the air conditioning, and I have no complaints. They're an A-grade company.”
“The Abacus technician was very knowledgeable. They're A+.”
“Abacus Plumbing did work on my air conditioner. I was very impressed with the technicians. Their customer service was excellent. I would give them an A+.”
“Abacus Plumbing did their job as they were supposed to. The workers were very polite and very knowledgeable, and their work was high quality. The customer service was excellent, too. They cleaned up whatever they did. The last time they came out, we just had a regular routine checkup, and the time before that, they had to put something in our yard to replace something. They cleaned up and did a good job. I have been using them for two years, and I chose them over other companies because I thought they were the best. They get an A+.”
“ We've been using Abacus Plumbing for the last four and a half years, since we moved to Houston. They're extremely professional and extremely timely. All of the servicemen that have come were very knowledgeable. I would give them an A+.”
“Abacus Plumbing did some work in a house that we sold. They were very good, and the quality of the work that they did was good. They replaced a switch on the air conditioner and a thermostat as well. I would use the company again, and I would tell a friend to use them. They were good. I'd give them an A+.”
“Abacus Plumbing did air conditioning service for me. I thought they did a really good job. They did what they said they'd do, and their service was good. They did a routine checkup and tune-up. They arrived within their time frame. I would give them an A+.”
“I think Abacus Plumbing had to replace some kind of drain hose for my air conditioning unit, and then they cleaned my drain lines out. The technician was knowledgeable and very friendly. They're quick and efficient, and the work was good. They did pretty good. I'll give them the A+.”
“Abacus Plumbing was on time and efficient. Everything's working great. I've had them out twice, and I've had no problems at all. They typically do repair work for me. I have been using this company for about a year. Everything they've done has had no problems, so I have no complaints. They're an A+.”
“Abacus Plumbing did A/C work. It was fine. They seemed professional, and the quality of the work was fine. Everything's held up just fine. I would give them an A+.”
“Abacus came in and thoroughly analyzed my situation. They were professionals. I would give the company an A+.”
“They were very timely, very efficient, and they know what they're doing. I'd give them an A+.”
“Abacus Plumbing was great. We also had them do our air conditioning. I have not had any problems with the work that they've done—everything's fine. I would definitely use them again, and I would definitely give them an A.”
“Abacus Plumbing did an air conditioning check for me. That was my first time using them. I would use them again. The guy was great—he did a good job. They did what they came to do, so I would give them an A.”
“They repaired the air conditioner. They were good at scheduling the appointment, and the gentleman who came to the house was very competent and knowledgeable—he just did a good job. I would say Abacus Plumbing gets an A.”
“Abacus Plumbing was on time. They did a tune-up on the air conditioners, and they took care of everything that needed to be done. I think this is the third time I've used them, and I have been using them for a little over a year. I would give this company an A.”
“Abacus Plumbing serviced our air conditioner. They were good at communicating what needed to be done, and then getting the work done in a timely fashion. This was my first occasion to use them, and I think I would use them again in the future if I had additional services that I might need. The initial customer service contact was good. I would give them an A.”
“They did a great job. My experience was great because they just came in, did what they needed to do, and they were finished. My air conditioner wasn't working, and the technicians were very helpful. The customer service was good. Everything's held up good. Abacus Plumbing gets an A.”
“I've used Abacus Plumbing before. It had something to do with the air conditioning motor. They're fine. I'd give them an A.”
“Abacus Plumbing did several things—plumbing, air conditioning, and all that stuff. They're always on time, and they always explain what they're doing and what they need to do along those lines. I would grade them an A.”
“I had air conditioning work done but not the plumbing. It was fine. My air was out and Abacus Plumbing came and fixed it. The quality of work was fine—it worked—and I would use the company again. They did fine. I have no complaints. A.”
“They were prompt in responding when I called for various services. They did a good job overall. We bought an older house, and Abacus Plumbing did some plumbing work and unclogged the drains. I've used them for other services, too. They replaced my air conditioning system and did some other remedial plumbing work to bring the house up to code. I haven't been using them for long at all—just since I moved to the area about four months ago. They're an A.”
“We had a little bit of A/C and plumbing work done by Abacus. It wasn't a whole lot. They've done some plumbing work for me, and they came and checked out my A/C for a maintenance check thing. My experience with them went very well, and I think they did very good work. So far, it's held up just fine. They finished in a reasonable amount of time—a lot faster than I thought they would have. I would certainly recommend them to someone else. They were an A.”
“Abacus Plumbing repaired an A/C unit and then did a checkup on it. They came out for the repair and then did the checkup, and that was it. The checkup was part of a year warranty thing or something. This is the company that I would contact if another need arose. I would give them an A.”

I had a wonderful experience with Abacus Plumbing & Air Conditioning. Each time I've used them, it has been very, very good. They put in an air conditioning unit and a heater, and they put in a water heater and faucet. They're very professional, and the workers that have been out here have been nice and very helpful. They get an A+.

Abacus is a good company, and I'm really happy with them. I've used them for a handful of years now, and I'm pleased. Last time, they were here for air conditioning issues. Everything worked out well. They did a good job, and I'm very happy with it.