Best Heating & Air Conditioning / HVAC In Gaithersburg

“I love GAC for their customer service and professionalism. Jaylen White exemplifies both. He was very polite, on time, and explained many things.“

“I so look forward to them coming to service my Air Conditioning Unit, because they're so proficient & I'm often left more informed. Professional top notch!“

“On several occasions , Eric has come to my
home and has always provided great service! He also provides great recommendations based on his plumbing experience and observations!“

“The outstanding team of Mack and Michael were professional, thoughtful and thorough. They evaluated the current system and presented the options with greatly appreciated details. We are looking forward to making Presidential, Inc. our go to for all things HVAC in our new home. Thank you, Presidential!“

“Cool Breeze installed new HVAC system for my parents. They were very happy with the work.“

“Vick has recently installed a new AC system in our house to replace the existing unit, he and his team team have done a highly professional job with excellent workmanship. Vick is also very responsive in communication which I appreciate a lot.“

“Yonas Mekonen (HVAC Tech) was very courteous, highly knowledgeable, honest, and a pleasure to work with.“

“These guys are great! They were quick and efficient and were willing to answer my questions.“

“Rod Miller replaced two old furnaces and two old air conditioning installations in a day and cleaned up thoroughly after the work.“

“B&B team led by Junior installed replaced our 20 year old heat pump system. They did excellent work. All the technicians were polite, kept the work areas clean, and were very communicative. Junior does beautiful work.“

“Our oil heat furnace broke on what felt like the coldest day in November, and Mallick Mechanical truly came to the rescue. They were the only company able to come out the same day to assess the situation and provide an estimate. Tyler was wonderful. Very knowledgeable, professional, and incredibly helpful in walking us through the process of converting to a heat pump and installing a new AC unit.
Their communication was prompt, clear, and consistent throughout. Once the parts were ordered, a team came out quickly for installation. Every technician who worked on our home was professional, efficient, and hardworking.
We couldn’t recommend Mallick Mechanical more. Exceptional service from start to finish!“

“July 4, 2026 weekend brought record-breaking, sweltering heat but did not stop Gayle and Manny to come by on short notice and an unscheduled service call to troubleshoot and fix my heat pump failure. Hecox is old school, honest and customer service focused. Checkbook recommended and I can agree 100%!“

“Love working with the team at ADI Heating & Air Conditioning LLC. Ronen provides amazing customer service.“

“Refrigeration Heating & Air Conditioning impressed us with fast and reliable service.“

“Diversified Hvac Services is a great HVAC Service. The team was excellent and extremely efficient. I strongly recommend using them if u need any HVAC Service. The crew was so helpful and respectful.Service: HVAC system maintenance“

“For over 20 years I’ve been a property manager of a 36-unit townhome community, built over 50 years ago. During this time, I’ve engaged numerous contractors to perform various types of work throughout the community. This is the first time I’ve been compelled to write a review.

Over the past two years I’ve had two significant projects where I’ve engaging the folks at Harvey W. Hottle, Inc. The first project was to replace all 36 units interior main water shut off valve with new pressure reducers and two ball valves. These 36 units were completed in just over 32 hours. When WSSC turn our water back on not one unit had a leak. (Very impressive to say the least.)

Before they began the project, they inspected each unit and scaled the appropriate manpower to complete the project. Six teams worked together to pull this off in what I feel was record time. The crew were personable, professional, efficient, capable and just good people. I couldn’t have picked a better choice for this project.

Given their previous success we engaged them again this spring to hydro jet our entire sewer system. This system had never been cleaned, since it was built in the early 70’s.

They started in the basement toilet and hydro jetted the line to the main sewer line on our property. As they moved down-hill they went into every 15’ deep manhole on our property to hydro jet these sewer lines too.

Both projects were completed on-time, on-budget and to our complete satisfaction.

I highly recommend you speak to them about any of your plumbing needs.
The guys at Harvey W. Hottle know who I am. Should you like to speak with me directly just contact them and they will forward you, my phone number. I would be glad to meet at my property to better explain their exceptional work.

MIkel“

“We’ve used Germantown for years in our last two homes, both for installation of new systems and annual maintenance. They’re very honest and always give good advice. Their prices are very good. We just replaced our 21 year old system with a new Lennox, and we were so impressed with what a good job they did (in tight quarters, no less) and worked with our time frame. Thanks for everything!

In my picture, the new Lennox unit is on the left. The mini split was already there but they leveled the compressor for us.“

“Ben Feeney with Boland: I’ve have had an exceptional experience of working together on a few projects so far with Ben and his team. He is a true professional that cares about his work. He communicates really well and always has a phenomenal attitude. Always refreshing to work with someone who is willing to build relationships.“

“We had our gas furnace replaced yesterday. The company was on time, organized, polite and efficient. They took the time to lay down tarps and left my laundry room (where the furnace is) cleaner than when they got there. Pricing and warranty options were also very reasonable and competitive- I was given repair options or replace options and didn't feel like I was being sold on something I didn't need. Definitely recommend!Service: Heating system installation“

“We needed to double the CFM in our return air side after installing a modern, high-pressure HVAC system. AAA rebuilt the center hallway ceiling return air vent and added ceiling returns in the master bedroom and front entrance. The project took 1 day, and the crew were very careful about removing dust, debris, etc. The price was right and our new returns, which replaced decades-old rigid pipes with a mix of insulated rigid and flexible, make the house feel balanced. The HVAC no longer is strangling when it runs. Recommended!“