Hours: 24 Hour Answering Service

MD (301) 260-6000 VA (703) 777-9211

How can we help?

Your Reliable HVAC Contractor in Potomac, MD

Whether you find yourself in the sweltering heat of summer or the frigid cold of winter, Mannix Heating & Cooling is your reliable HVAC services provider in Potomac, Maryland. With years of experience under our belt, we are dedicated to ensuring that your home or business stays comfortable all year round. Our skilled technicians are proficient in servicing all types of HVAC systems, delivering top-tier workmanship and customer service.

As the go-to HVAC contractor in Potomac, we take pride in our comprehensive services. These range from routine maintenance and repair to full system installation. We only use the highest quality products and equipment in our service provision, always ensuring that our customers are happy with the results. Moreover, we understand that HVAC issues can happen at any time — that’s why we offer emergency HVAC services to take care of those unexpected incidents.

Quality HVAC Services: Repairs, Replacements, and Installations

Our team is armed with knowledge and expertise in a broad range of HVAC services. Whether your faulty heating system needs a repair or it’s time to replace your cooling system, we’ve got you covered. Our service also extends to the installation of new HVAC systems, helping Potomac residents enjoy the benefits of a high-efficiency HVAC system, including energy savings and improved indoor air quality.

Beyond repairs and installations, we understand the importance of preventive maintenance in extending the lifespan of your HVAC system. Our maintenance plans are designed to keep your heating and cooling systems running smoothly, spotting potential issues before they lead to major breakdowns or inefficiencies. We carry out thorough inspections and necessary tune-ups, saving you time, money, and potential frustrations long term.

Eco-Friendly HVAC Solutions

At Mannix Heating & Cooling, we strive to provide HVAC solutions that do not only improve comfort but also are environmentally friendly. We promote the use of energy-efficient HVAC systems and employ eco-friendly practices in our service provision. By choosing us, you are making a positive contribution towards reducing the carbon footprint and making Potomac, Maryland a healthier and more sustainable place to live.

Our commitment to delivering exceptional customer service sets us apart from the competition. When you choose Mannix Heating & Cooling, you are choosing a partner who is ready to walk with you every step of the way. We take the time to understand your heating and cooling needs, providing tailored services that are right for you. Choose us today for unmatched HVAC services in Potomac, MD.

Furnace Repair, HVAC Near Me, AC Service & Heating Installation in Potomac, MD

Furnace Repair in Potomac, MD | HVAC Near Me

Furnace RepairHVAC Near MeHeating InstallationAC Service ∴ Potomac, MD

Mannix Rewards

Receive a $100 Mannix Heating & Cooling Visa® Prepaid Card

Customer Referral Program

Customer Reviews

Shondra J ones

They were lifesavers!!! My furnace went out and after three days of dealing with the home warranty company and the unscrupulous vendor they sent to my home, I called Mannix. The service technician was friendly, efficient but most of all honest. He found the problem after twenty minutes, saving me thousands in unnecessary replacement costs. It is refreshing to know that honest people still exist.

Lynne Wilson

I contacted Mannix from a referral of a friend who has benefitted from the excellent service this company provides. I found out a couple I know in Vienna had their heat pump stop working a few months ago and needed to be replaced. I called up the Mannix office later in the day on Monday 11/30/20 and provided information needed. I had a proposal in my email the next morning 12-01-20. This will enable me to discuss with my friends how they wish to proceed with fair financing options available too. This is EXCELLENT customer service and I would like Mr. Mannix to know that Sarah is an amazing professional face for his company. I plan to become a customer of theirs by signing up for the annual maintenance plan which is very reasonable priced. Sincerely, Lynne Wilson

Philip Slingerland

Been a happy Mannix customer for a few years now, but recently had them replace our aging HVAC system. The whole process was very painless, from Eric helping us decide which system was right for our home, to the efficient and professional installation by Billy and Matt. I am very pleased with the new system and very impressed with the level of service, communication, and detailed information I received from everyone involved. Highly recommend!


Before dealing with Mannix I used two very well-known and “reputable” HVAC companies who did nothing but rip us off over the years. I was frustrated and found Mannix Heating & Cooling about 10 years ago. They installed a new HVAC system in my old home, and installed a water heater and various other items in my new home. They also have been doing yearly maintenance for years. Their employees are the most honest, reliable, and knowledgeable individuals in this industry. We recently had an issue with our HVAC system and they came out within a few hours on an emergency call. The technician was prompt, kind, professional, and very fair. He figured out what was wrong with our system quickly and remedied it immediately. Do not hesitate to call them if you need anything–you won’t regret it!

Wendy Collins

Mannix has always been professional from service calls to repairs and replacements. The technicians are always polite and knowledgeable. They consistently exceed our expectations.

Gary Hendricks

Mannix proved very responsive in fixing my A/C system. The tech, Erick, was very professional by taking the time showing and explaining to me the system problem prior to taking action replacing the coil. Ashleigh, customer service, was excellent in addressing and following through on concerns in order to achieve total customer satisfaction.

M. Reyzer

My 24-year-old heat pump finally decided to stop working. I sent a request for a replacement estimate late one night through the Mannix website and received a phone call early the very next morning to set up an appointment. Eric Holzworth stopped by my house the next day to go over my options. He was wonderful and so easy to work with and answered every question I had. He definitely listened to me and my concerns did not push me into purchasing a high-end system which I didn’t need. The technicians arrived at 8am and were finished with the entire installation by 1pm. They were very courteous and left my house in pristine condition. I HIGHLY recommend Mannix! They always returned my calls and emails right away, and Eric made sure I received all of my equipment on time–even with Carrier factory delays/limited supplies due to COVID. So glad I chose Mannix. I love my brand new Carrier system and my cold house during these hot and humid days.


We were in desperate need of a fix on our AC system during the July heatwave. The issue arose on a Saturday. Mannix came to the rescue in short order, fixed it, and at a reasonable price.

Silvio G was the technician, and he was GREAT.

We would definitely use Mannix again!

Patricia Ryan

I have been using Mannix for years. They have replaced my HVAC system and I have them do maintenance twice a year. The past couple of visits have been done by Ramiro. He is professional, polite, knowledgeable, and very helpful in assisting me with tips on the best ways to operate my system. Today, he installed a water safety device and taught me exactly how it works and how to reset it. I’m so impressed with him! I will continue with Mannix for years to come as I find them to be very reputable and reliable. Thank you!

Rachel Craft

I’ve been using Mannix for years and have never been disappointed. They’ve replaced my HVAC, hot water heater and installed a humidifier on my furnace. Whenever I need them, they can get me on the schedule in a timely manner. All the personnel are great and I trust Jerry and his team with their recommendations and the work they do. Would highly recommend.

Read more reviews

Chantilly, VA Gaithersburg, MD

Potomac, MD