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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."

"Outstanding service!! Highly recommend. Very thorough! It was a difficult job to determine why the lights in my home were not working properly, but he methodically and patiently determined the multiple problems and repaired everything . So grateful and thankful for the same day service. Wouldn't hesitate to use again."

"The repairman was professional, courteous, efficient, and friendly. We called for emergency help as the heater failed to come on, on a cold Sunday. He arrived within an hour. He quickly identified and repaired the issue. I recommend their service to all."

"We have been thoroughly satisfied with the Holtzople team. From Corey in service to Austin, who handled the estimating for our new HVAC unit, and finally to the installers, Eric and JT, the level of professionalism demonstrated by the entire team has been exceptional. Throughout the years we’ve worked with Holtzople, we’ve consistently felt well cared for—something that’s becoming increasingly rare with vendors. I highly recommend them for service or any HVAC needs you may have."

"Excellent services from Tony Frost of Horizon. Visited hours after my request (broken faucets), supplied me with options, provided a quote, and conducted the repairs immediately. All plumbing is expensive, but cost was actually lower than expected. Worked out great, five stars across the board."

"Service repairman was courtesy, and knowledgeable."

"I recently had a new HVAC system installed, and I couldn’t be happier with the experience. From the initial consultation to the final installation, the team was professional, knowledgeable, and efficient. They took the time to explain all my options, helped me choose the right system for my home, and answered every question clearly. The installation was completed on schedule, and the crew kept everything clean and organized throughout the process. The system runs quietly and has already made a huge difference in comfort and energy efficiency. I highly recommend this company to anyone looking to install or replace their HVAC system. Excellent service, fair pricing, and top-quality workmanship!"

"Professional and efficient. Chris did an A/C repair on a part under warranty from another company. He quickly coordinated getting the new part through the warranty and completed the repair quickly. Will recommend to others."

"Outstanding service. Polite. Professional. Very competitive pricing. Clean crew and clean job site when finished. I would highly recommend this company for HVAC. They will be back to clean my ducts soon."

"Placed Service Magic request during the evening when our central air unit shut down during the dead of summer. I received a call from Andrew within a minute of making the request. Literally a minute! He was over the next morning around 10:30. Within 5 minutes he had the problem diagnosed as the blower motor being dead. He had to leave to get the part, but was back very quickly and had the system fixed within 45 minutes. He was very consistentious and I would highly recommend this company."