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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."

"We were extremely happy with our entire experience. Grove responded quickly to our inquiry - provided a quote the next day and started the day after that. Our attic air handler was very difficult to access and Grove had a "can do" attitude about the entire installation. The price was comparable to other bids - but for a better system and with a much better explanation. They were on time, complete, and clean. We will absolutely use them again."

"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..."

"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."

"Installed the next day once we made the decision to move forward. Waiting for them to come back to start up furnace and drain the line."

"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."

"I couldn't be happier with the service I received from McCrea Heating and Air Conditioning Services of Maryland. Upon returning from vacation on a 100 degree July day, I found my old HVAC system basically dead (90 degrees in my kitchen!) ... Shane immediately came out to provide an estimate, we signed a contract on the spot, and he kindly provided some freon to hold me over until the new system could be installed. Brian and Nick showed up exactly on time to install the unit, used drop cloths to protect my flooring, and were exceedingly polite and professional throughout. I'd highly recommend this organization."

"They (2 workers) did an EXECCENT job installing gas heater and Central Air unit. They were very polite and professional. I could not convince them to take a coffee break. Answered all my question. I'm soo happy I chose Blue Dot !! Also the price was unmatch... Thanks !! PS... The Wife is back to calling me HONEY again :)"

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.

"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."