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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."

"Excellent! The whole process was explained well, and the installation was very clean and efficient."

"In researching the installation of a brand new central air system I got four bids. Dean's Heating & Air Conditioning saved us from the over-charging, poorer quality large commercial options - which there are too many of. Michael Dean is a conscientious, experienced craftsman who takes pride in his work, joy in figuring out challenging jobs, and backs up his work with a personal guarantee that means something when your name is on the business. The team did a full design and installation of a two-zone, 6-ton Trane central air conditioning system without taking up an inch of our living space. Amazing! One large company didn't even want to bid on the job when they learned that our historic 1920 Dutch Colonial home had no existing ductwork. Michael and his team took on the challenge, finding space in the walls, attic, and basement that I didn't even know we could use. We couldn't be happier with the result: perfectly cut openings for the vents and returns, beautiful ductwork, and a personal guarantee that I believe in. I couldn't recommend Dean's more highly."

"The system was installed as scheduled and is working great. The company representatives were friendly and helpful."

"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..."

"The installer was very efficient and when finished, he explained everything. Very pleased!"

"Perfect! Doug is an expert Plumber that knows private water system. He removed the old equipment and installed the new. Everything is still working great. The work was done almost 13 years ago. We used all Top of the line Gould Equipment. I probably should call Doug to replace it again because breakdowns with the water system can leave you stranded."

"The installation team - Ramone Rivera - was professional and kind - great work"

"The technician did an excellent job installing the faucets in the very tight space. He was professional and I would be happy to work with him again."

"I got quotes from a few different contractors. Carroll Mechanical’s was very competitive. It was the best value so I decided to go with them. The installers were prompt and did a fantastic job. The new system works great and they walked me through everything before they left. I have an ongoing maintenance so I know they will continue taking care of the new unit and making sure it works well. Overall, very happy with my choice."