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"I’m back again to write another stellar review for GAC. Last year they replaced our HVAC system; this year we circled back and had them install a home generator. This was a long and drawn out process due to the various approvals needed from Montgomery County as well as coordination with Washington Gas (which ended up not just being a simple sign off but necessitating an additional, expensive upgrade to the gas line from the street to our home). Nevertheless, GAC did a fantastic job shepherding this process over the 6+ months of waiting on stakeholders, and they were also maximally accommodating to our family’s significant constraints on time and availability (due to health concerns related to a medically fragile family member). A special kudos to Sandy M, GAC’s master electrician, who took it on personally to ensure we were taken care of all throughout this process, going above and beyond with phone calls, text messages, personal visits, etc. on behalf of my family, I want to thank GAC and am giving top marks across the board for this effort which was complex , lengthy, and ultimately successful."

"Everything went extremely well. I found Grove a completely professional organization with highly skilled workers. Their plumber subcontractor handled the installation of all gas piping in my house, oversaw the hookup with BGE's gas line and installed the hot water heater. Grove provided a skilled crew of 5, with 2 working outside and 3 inside to remove all old equipment, do some duct repair and install the new air conditioner, gas furnace, humidifier and thermostat in 2 days. They also removed all debris from the worksite and swept it clean. Their work proposal included a year's maintenance, which I feel sure will be equally satisfactory. This was a big project (3 days including the plumber), but I am confident they would handle both small and large jobs with the same competence and professionalism. I highly recommend them."

"They were excellent! Scheduled a consult the day after I called and gave a very quote! New furnace and vac unit were installed in a matter of hours..."

"Replaced old HVAC system. Very knowledgeable team that provide competitive and comprehensive solutions. Great customer service and were in and out in one day with quality workmanship. We couldn t be more pleased!"

"Managers were knowledgeable, and techs were fast commutative about the install."

"Not always as responsive as I'd have liked beforehand, had a discussion with them about it. Install went well despite a cure ball I gave them the morning of the installation."

"The plumber that came out was professional and knowledgeable. Talk me through the process before starting and after installation cleaned up well, then tested everything to make sure there was no leaks in the system."

"Comfort Consultant John Kline came to assess the situation. He was on time, very professional and extremely helpful. He determined I needed 2 new parts and arranged for them to be ordered and will be installed this week. He went out of his way to explain the situation and as it is very warm right now he gave me suggestions on what I could do to minimize the discomfort. He also helped me with my screen door which allows cooler air into the house. I was very happy with the service I received."

Serving Mount Airy & Surrounding Areas Since 1949\nOne Hour Air Conditioning & Heating® of Mount Airy is proud of its long history serving the Mount Airy community. Our business began in 1949 as a furnace and air duct company. In the 1950s, we began building custom homes and commercial buildings. However, we devoted our attention to HVAC work full-time in 1993. Since then, we focused on making the residents of Mount Airy, Frederick, Gaithersburg, and surrounding areas in Maryland comfortable in their homes.

"I shopped around and received quotes from this company and 3 others for installation of a new HVAC for my condo. Horizon had a fair price and the customer service and installation was worth it. The technicians and consultants were all professional and got the job done in a timely manner. Would hire again and highly recommend to others. Thank you Shawn, Michael, James, and Butch!"