GAC Services Gaithersburg, MD

Rated Excellent
Rated Excellent from 11 reviews
We are the most professional and most referred heating and air conditioning company in the county. From our hometown roots in Gaithersburg, we've been tied to Montgomery County and the surrounding area since 1970. For us, our business is about developing long-term relationships. Our team of professionals have satisfied tens of thousands of customers over the years and we are ready to meet your needs for heating, air conditioning and indoor air quality improvements.

So, if you need a tune up, emergency repair on your air conditioner or a heat pump replacement, we will be available when you need us and get the job done right the first time. We understand that your home is an important part of your life and making you comfortable is an important part of ours. You have our personal assurance that we will stand behind all our work.
Services Offered
  • Cooling Services
  • Heating Services
  • Indoor Air Quality
  • Installation Services
  • Maintenance Services
  • Repair Services
  • Replacement Services
  • Systems & Equipment
Contact Information
Phone Number (240) 534-3115
City Gaithersburg, MD
Zip Code 20877
Address 227 E. Deer Park Drive
Professional Associations and Certifications
  • Air Conditioning Contractors of America
  • North American Technician Excellence
Air Conditioning Contractors of AmericaNorth American Technician Excellence
Reviews and Testimonials
Rated Excellent (5 of 5) from 11 reviews
  Testimonial by Michael Prodywus
I had a complete heating and cooling system installed in my home recently by GAC Services. From the sales process, duct cleaning, and installation, I was impressed the entire way. The sales person sized everything from scratch instead of assuming my current system was sized correctly. Other companies did not do this step and just read off the AC ton size, blower size, and BTU of my current unit and quoted that. It turned out my old system was too big!
Further, the installers (Matt, Phil, and Dave) showed up promptly on the scheduled day and finished quicker than I thought. Their installation was spotless and tidy and did not leave a mess behind. I would highly recommend GAC!
  Testimonial by Kim Schneider
Jim came to fix my air conditioning system right away Monday morning. He explained everything that was going on with my system thoroughly, and was a huge help in helping me understand the problem. He also gave great advice for future use of my equipment. Jim was completely professional and very easy to talk to. I appreciate his work today!
  Testimonial by Jason Gates
Fredy and Brandon were great today. We needed our thermostat replaced and they also did a system check and identified some issues. They took care of the issues and got us on a service plan that saved a couple hundred dollars. I'm so glad we switched from our old company to GAC! Fast service, professional, courteous, very cognizant of social distancing and health in our current environment, and adequately priced. Very happy with the service!
  Testimonial by Joseph Shore
Seasonal tune up; very knowledgeable and friendly guys. Adjusted my dampers and digital thermostat settings to run more efficiently. Recommended some services but it is a pretty new unit so they were in and out. Would definitely recommend!
  Testimonial by Susheal Gupta
We were in the market for a new Generac generator. I shopped around with a few vendors. Our business went to GAC Services. Bill (our sales rep) spent his time explaining all the options and recommendations considering our requirements and budget. Bruce and his install team were very friendly and considerate of my home. The workmanship was very clean. I would definitely recommend GAC Services. They seem to be a customer centric company. Actually planning to switch my HVAC service contract to GAC also.
  Testimonial by Mark Lester
Gary arrived first thing in the morning and did a very thorough inspection of our system. He quickly identified the issue and gave me a very clear explanation. He was also able to do some preventative maintenance that I can see will prevent future issues. Thank you!
  Testimonial by Lisa Anzelone
Excellent service today! We were terribly worried as our cooling system broke down unexpectedly. Our technician worked diligently to resolve the issue. He was thorough/clear in his explanation of the cause, polite, and honest. We are grateful customers!
  Testimonial by Katie Norris
Gary is THE BEST! Our A/C stopped working and Gary came out last minute at 7pm to ensure our family didn't have to sleep in the terrible heat. He was extremely personable and explained everything he was doing along the way. Even when he realized he didn't have a part he needed, he had a coworker come out and bring it to him- he could've easily left and rescheduled us for the next day as it was past 8pm at this point, but he did not! He waited with us and we chatted about our kids and lives until the part was delivered and he quickly installed it and got everything working again! Honestly I would have Gary over to a family BBQ thats how much we enjoyed him!
  Testimonial by Cheryl Cross
I highly recommend GAC. Their employees (from the office to the technicians) are very professional, prompt, courteous and polite. My A/C went out on a Sunday. My mother who's stay with me has severe respiratory issues. Chris came in for a consultation on Wednesday, thoroughly inspecting the house and explaining to me the options available for a new system and what would best suit my needs. He answered all my questions and went out of his way to see that I had a/c by Friday. Noah and Iggy, the installation team, were very thorough as well. They worked non-stop installing the new heat pump and furnace. They explained what had been done, we're patient and answered all my questions and even helped me connect the thermostat to my phone.
  Testimonial by Stacy Kravitz
Our system broke for the second time in two days, we requested a senior technician this time because we anticipated having to replace our entire unit. The tech was professional & understanding & listened to everything we said. Diagnosis was quick but thorough and we had a new part and we are back and running in a couple hours. I will forever keep a service contract with GAC - it saved us $500 this time! - thanks GAC!
  Thanks GAC!
by Jeffrey Wible
Jul 31, 2020
Replacing my AC equipment was my third project with GAC. The first two were furnace replacements which I was provided great service and my (2) Bryant units are quiet and keep my old house warm. I upgraded my AC unit this past April - another great install. I've had some time to use my AC with the continued hot weather and compare billing from this time last year. It was even cooler last spring summer and still I have reduced my electric bill by almost half. This is in addition to reducing my NatGas bill with the new furnaces. Love the savings.
I recommend this business
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