GAC Services
Company Overview
Esteemed HVAC, Heating and Cooling & Electrical Contractor.
Our dedication to developing skilled HVAC technicians, plumbers, and electricians, combined with our emphasis on customer-first service, has driven our success. We take pride in delivering priority maintenance, repairs, installations, and replacements, in addition to membership plans that cater to our customers' home comfort and safety expectations. Having served Gaithersburg and its neighboring areas for over 50 years, we specialize in offering remarkable customer service and quality craftsmanship to each of our customers. Our mission is to establish long-term client relationships by providing professional, trustworthy, reliable, and valuable customized indoor comfort and energy solutions. Contact us today to schedule an appointment with GAC Services and discover the GAC Difference!
Located in Gaithersburg, MD, GAC Services is a residential contractor specializing in cooling, heating, plumbing, and electrical services, establishing new standards in the Maryland HVAC and electrical market. Since our inception in 1970, we have earned a strong reputation for providing reliable cooling and heating services throughout Montgomery County and Frederick County. In 2014, we enhanced our service portfolio by adding electrical services, which allows us to offer our clients the same excellent service in a different area of expertise.
Tony Petrolle joined GAC as a warehouse helper in 1991 and has worked his way up to become the General Manager of GAC Services.
Tony supports the principle of leading by example and holds that it is vital to offer more than you take. Focusing on people and taking the necessary steps to ensure success are fundamental to operating a prosperous home services business.
Tony is passionate about bettering lives with superior home services and systems that guarantee comfort all year long.
Under Tony's leadership, GAC Services has seen remarkable growth, and the company looks forward to many more successful years serving the Gaithersburg community.
Business Services
- Bathtub installation
- Bathtub repair
- Circuit breaker installation
- Circuit breaker repair
- Doorbell installation
- 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 installation
- Garbage disposal 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 repair
- Shower installation
- Shower repair
- Sink installation
- Sink repair
- Sump pump installation
- Sump pump repair
- Toilet installation
- Toilet repair
- Water heater installation
- Water heater repair
- Water pipe installation
- Water pipe repair
Business Location & Hours
| Mon: | 7:00 AM - 6:30 PM |
| Tue: | 7:00 AM - 6:30 PM |
| Wed: | 7:00 AM - 6:30 PM |
| Thu: | 7:00 AM - 6:30 PM |
| Fri: | 7:00 AM - 6:30 PM |
| Sat: | 7:30 AM - 4:00 PM |
| Sun: | 7:30 AM - 4:00 PM |
Recommended Customer Reviews
We purchased a Bryant unit about 6 years ago from GAC. Our AC stopped working(compressor under warranty). They wanted almost $5000 to replace the compressor!We called several other companies who were all able to give us a quote under $2000. Run! They will rob you!
Dealing with this company has become the greatest customer service nightmare of my life. The new AC we purchased broke down on the first hot day of the season, two months after the purchase. When we attempted to get it serviced, the technician serviced the wrong unit. We clearly explained that the upstairs unit that we had purchased from them was having issues - our downstairs unit was older and we hadn't bought it from them, and it was cooling normally.
After we pointed out the problem, we were told that only a manager could do anything about this, but no managers were ever available. We left messages that went unreturned. We spent upwards of 40 minutes on hold. Most of the time when you call, you get AI Agent Anna; she hung up on us multiple times. We would have to keep calling again and again to get a human, but even the human representatives couldn't help and only offered to take a message for a manager.
We chose this company because it was well regarded and well reviewed and we did not want to take a chance on something as important as our AC system. We cannot believe the treatment we are receiving from them.
One of the worst co there is. Tried to get them to come to the house twice now, BOTH times they were a no show without any explanation. They wont call, txt, or even email you w updates or cancelations. We were 1st on the list today, we called them mult times and everytime its the same thing....""were finishing up, be there soon"", then NOTHING
Horrible service and disrespectful. Had call them to bring someone after they did a cleaning One of the units stopped working and the thermostat stopped working. The service tech who came back did want to wear a mask as I am immune compromised. He raised his voice and said I should get another tech. Horrible attitude in general.
I was happy to discover this business through your ratings. Our technician, Philip, was an agreeable and punctual fellow who did a perfect repair of some
improperly fitted kitchen pipes that had been poorly done by a different firm.
His work resulted in the best-looking and functioning situation under that sink ever, and likely saved the new disposer that had the faulty trap connection. The pricing for everything was extremely fair by any standard, especially for such good work and attention to detail.
Thanks.
Oscar C.I would give zero stars if that were possible. Stay away from this company for HVAC servicing, as their technician lacks knowledge and skills.
The thermostat of my two-year-old HVAC system suddenly went blank, so I decided to call GAC, as they installed our unit. The technician came the next day, performed a few tests, and determined that the transformer was the issue and needed to be replaced. After replacing it, the system still didn't work. The technician said it was too late to complete the repair at that time.
He returned the following day to conduct more tests and mentioned that there was no power going to the thermostat. This time, he suggested that the problem might be with the control board. Given that our unit is only two years old and we take good care of it, I didn't believe that was the issue, so I pushed for further testing.
After several hours of diagnosis, the technician confidently stated that the wiring between the control board and the thermostat was the culprit. He recommended that we have the GAC electrician team rewire it.
I scheduled an appointment for the next day, and the electrician arrived but admitted that he wasn't familiar with the details of the job and hadn't brought the necessary wires. He returned the following day, and I asked if he could test the existing wires to confirm whether they were indeed faulty, as I didn't want to pay to fix something that wasn't broken. Unfortunately, he refused to do that, stating it wasn't part of their job to check the wires. After several hours and having to make a hole in the wall, a new wire was installed. However, they mentioned that they would need the HVAC department to come in and connect the wires.
The HVAC technician returned and connected the new wire, but guess what? It still doesn't work! He performed a couple more diagnostics and discovered that one of the water safety switches had gone bad, which shorted the circuit and stopped power from reaching the thermostat. Interestingly, the number one reason for a blank thermostat when you search on Google is a faulty water safety switch! He mentioned that he tested the water safety switch before recommending the wire replacement.
The unit is now functioning after needed to take four days out of my work and ~$2,000 in costs. If this is the extent of the problem, we are open to hiring a professional to resolve any issues. However, it seems the technician turned a $200 issue into a $2,000 problem.
The overall process across all teams, including scheduling, is terrible; it feels like visiting a dishonest mechanic who advises unnecessary repairs to cheat you.
*Updated*
I was charged over $600 for the tech to simply replace a kitchen faucet, which I had already bought and had all the parts for, so that price was just for labor. The tech was here for less than an hour and it was a simple installation, so $600 seems very high to me. The invoice had no details of what went into that charge, it just says ""install customer provided faucet and remove existing faucet.""
To add insult to injury, the tech also said I had a leak under my sink and that me garbage disposal needed to be replaced- which would be an additional $800. Thankfully, I got a second opinion from another plumber and he found no leak and said my garbage disposal was fine and did not need to be replaced.
I have tried calling customer service numerous times and have received no response. I would not recommend GAC Services to anyone and I will never use them again!
I scheduled a water heater repair for my rental property because it seemed like an electrical issue was causing the breaker to trip. Since the water heater is only 7 years old, I preferred to repair it rather than replace it. I was charged $114 for the service. However, the technician didn't communicate anything to my tenant during the visit, and I haven't received any updates from GAC either. The only thing I got was a shockingly high estimate--over $4,000--for a full replacement. There was no explanation of what part actually failed or whether a repair is even possible or worthwhile.
It feels like all I paid for was a very expensive estimate, without receiving any real information or service in return. Overall, this has been a very disappointing experience.
We called GAC for an issue with poor drainage from our washing machine sink.
GAC's assessment was that we needed to excavate (involving digging underground of our house) to the tune of a $6,000+ price estimate (with no guarantee that this work would resolve the issue.)
Thankfully, we solicited a 2nd opinion before proceeding. The 2nd vendor indicated that the issue required a simple snaking of the drain at a cost of less than $300.
The 2nd vendor completed the work in less than 15 minutes and we have had no problems since the work was completed. Completely satisfied.
While GAC has provided satisfactory service for us previously, I definitely encourage all consumers to solicit 2nd opinions, especially for projects estimated at $1,000+.
Brian M.Run from this company as fast as you can! They almost robbed me but thank goodness I spoke with a neighbor and had his guy come out. They tried to get me for 3k worth of stuff I didn't need 2 years after selling me a brand new unit that doesn't work right. And wasn't installed properly. GAC is inept and dishonest.
Now I just got a letter in the mail saying I owe $143 and it's 121 days late. If they had ever called or told me I owed them money I would have paid right away. They had even refunded $200 from that ""service"" if you want to call it that.
Stay away from GAC. Too big of a company. Doesn't care and can get away with hiring cheap labor.

























