Updated October 2026
Maryland winters swing from mild to bitter in a week, which is hard on heat pumps and older furnaces alike. If your system hasn’t had a check-up since last winter, October and early November are the best time to get on a company’s schedule.
Here are local heating and air conditioning contractors across the Maryland side of the DMV, grouped by county. They range from family shops that have been around for generations to mid-sized companies with 24/7 dispatch.
How this list was put together: every company here is an independent, locally operated HVAC business we verified against its own website or a public business record. Nobody paid to be included, and the order within each area is not a ranking. Each name links to the company’s free DMV Business Connect listing with contact details, services and a map.
Jump to: Montgomery County · Prince George’s County · Howard County, Annapolis & Baltimore · Frederick & Southern Maryland · Fall heating checklist · How to choose
Montgomery County
Gary P. Frank, Inc.
Bethesda, MD. Bethesda heating and cooling contractor and Carrier dealer serving Montgomery County, Northwest DC and nearby Northern Virginia. Works on hot water boilers, gas and electric furnaces, heat pumps, ductless mini-splits and humidifiers. View listing and contact info
ADI Heating & Air Conditioning, LLC
Gaithersburg, MD. Montgomery County HVAC company with over 40 years of experience serving upper Montgomery County and Northwest Washington, DC. Services boilers, radiators, radiant floors, oil heat, furnaces and heat pumps. View listing and contact info
GAC Services
Gaithersburg, MD. Family-owned HVAC, electrical and plumbing company founded in 1970 as Gaithersburg Air Conditioning & Heating. Installs, repairs and tunes up gas furnaces, heat pumps and hybrid heating systems across Montgomery, Frederick, Howard and Carroll counties. View listing and contact info
Presidential Heating, Air Conditioning & Plumbing
Gaithersburg, MD. Presidential Heating, Air Conditioning & Plumbing is a Gaithersburg company founded in 1982. It installs and repairs heating and cooling systems and offers plumbing, indoor air quality and maintenance plans in Montgomery County communities such as Bethesda, Rockville and Potomac. View listing and contact info
Don Hoffacker’s Air Conditioning & Heating
Germantown, MD. Germantown heating and cooling contractor in business since 1977, serving Montgomery County homeowners. Installs and services gas and electric furnaces, heat pumps, geothermal systems, ductless mini-splits and humidifiers. View listing and contact info
Glenmont Heating & Air Conditioning
Rockville, MD. Family-owned HVAC contractor founded in 1984 and based in Rockville. Handles heating repair, replacement and maintenance, including furnaces and heat pumps, for homes in Rockville, Bethesda, Olney, Gaithersburg, Germantown and Potomac. View listing and contact info
Robinson’s Air Conditioning & Heating
Rockville, MD. Family-owned HVAC company that has served Rockville and Montgomery County since 1974. Repairs and replaces furnaces, boilers, heat pumps and water heaters, and works on all major brands. View listing and contact info
B.M.C/Clower Heating and Air Conditioning
Silver Spring, MD. Silver Spring HVAC company founded in 1999 that installs, repairs and maintains furnaces, gas boilers, heat pumps and water heaters. Serves Silver Spring, Kensington, Bethesda, Chevy Chase and Northwest DC. View listing and contact info
Thomas E Clark Inc
Silver Spring, MD. Thomas E Clark is a family-owned Silver Spring company that has operated since 1891. It provides heating and air conditioning installation, repair and maintenance along with plumbing and drain cleaning across Maryland, Virginia and Washington, DC. View listing and contact info
Prince George’s County
Priddy Chimney Solutions
Beltsville, MD. Family-owned, woman-led chimney company working since 1982, licensed in Maryland and DC. Sweeps and inspects chimneys, installs caps and liners, repairs fireplaces and masonry, and converts fireplaces to gas or wood stoves. View listing and contact info
A One Heating, Air Conditioning and Plumbing LLC
Bowie, MD. Bowie-based heating, cooling and plumbing contractor serving Maryland and Washington, DC. Works on furnaces, heat pumps, boilers, radiators, baseboard heaters and water heaters. View listing and contact info
S&L Air Conditioning and Heating
Bowie, MD. , who left Sears to start it, and joined soon after by his son Stephen Jr. Based in Bowie with a second location in Greenbelt, the company focuses on customers within about 10 miles of Bowie. View listing and contact info
Nero’s Heating and Air
Cheverly, MD. Owner-run heating and cooling company in Cheverly with 18+ years of experience. Repairs and replaces furnaces and heat pumps, installs mini-splits and handles water heaters. View listing and contact info
Perry’s Air Conditioning & Heating Service
Clinton, MD. Licensed HVAC contractor based in Clinton with more than 30 years of experience. Installs and repairs gas furnaces, heat pumps and HVAC systems for homes and businesses in Maryland, DC and Northern Virginia. View listing and contact info
McCrea Heating & Air Conditioning
Temple Hills, MD. Heating and cooling company founded in 1936 with its Maryland office in Temple Hills and branches in Pennsylvania, Virginia and Delaware. Repairs, replaces and maintains gas and electric furnaces, heat pumps and geothermal systems. View listing and contact info
Belair Engineering and Service Company, Inc.
Upper Marlboro, MD. Upper Marlboro HVAC, plumbing and generator company founded in 1962 and managed by Debbie Risher. Repairs, replaces and maintains furnaces, heat pumps, boilers, gas fireplaces and thermostats across Prince George’s County, including Bowie. View listing and contact info
J & P Heating and Air Conditioning
Upper Marlboro, MD. Upper Marlboro heating and cooling company with more than five decades in business. Installs and repairs furnaces, boilers and heat pumps across Prince George’s, Anne Arundel and Montgomery counties, DC and Northern Virginia. View listing and contact info
Howard County, Annapolis & Baltimore
Barstow & Sons Heating, Cooling & Plumbing
Annapolis, MD. Locally owned heating, cooling and plumbing company serving Annapolis, Pasadena and Anne Arundel County since 1980. Installs, repairs and maintains furnaces, boilers, heat pumps and water heaters. View listing and contact info
R E Robertson Plumbing & Heating, Inc.
Annapolis, MD. Annapolis plumbing, heating and air conditioning contractor serving Anne Arundel County communities from Severna Park to Shady Side. Maintains boilers and repairs, installs and replaces furnaces and heat pumps, with NATE-certified technicians and 24/7 emergency service. View listing and contact info
Amazing Plumbing, Heating & Air
Baltimore, MD. Amazing Plumbing, Heating & Air was founded in 2006 in Baltimore. It handles air conditioning, furnace, heat pump, boiler and ductless system work along with plumbing and indoor air quality, serving Baltimore, Anne Arundel, Howard, Carroll, Harford, Montgomery and Prince George’s counties. View listing and contact info
Clean Air Heating & Air Conditioning Co., Inc.
Baltimore, MD. Family-owned heating and air conditioning company based in Baltimore since 1972. Installs, repairs and maintains gas and propane furnaces, heat pumps, ductless systems and geothermal systems across the Baltimore metro, including Dundalk, Canton and Essex. View listing and contact info
Buric Heating and Air Conditioning
Columbia, MD. Family-owned HVAC company founded in 2000 with offices in Columbia, Ellicott City and Olney. Installs, repairs and maintains furnaces, boilers and heat pumps across Howard, Montgomery and Prince George’s counties, with emergency heating repair. View listing and contact info
No-Frost Air Conditioning & Heating, LLC
Ellicott City, MD. Family-owned and operated heating and cooling company in Ellicott City since 1971. Installs, repairs and maintains furnaces, heat pumps and water heaters across Howard, Baltimore and Carroll counties, including Columbia and Clarksville. View listing and contact info
Frederick & Southern Maryland
BPM Heating, Cooling & Plumbing
Frederick, MD. Family-owned HVAC and plumbing company founded by Bert Miskell, started in Myersville and now based in Frederick. Installs, repairs and replaces furnaces, boilers, heat pumps and geothermal systems across Frederick and Washington counties and southern Pennsylvania. View listing and contact info
Holtzople Heating, Air Conditioning & Electrical Services
Frederick, MD. Holtzople is a family owned and operated heating, cooling and electrical contractor that has served Frederick County for more than two decades. It maintains, repairs and installs furnaces, boilers, heat pumps and AC systems, and also handles residential electrical work such as generators and panels. View listing and contact info
Smock HVAC
Frederick, MD. Frederick-based HVAC company operating since 2005, with a second office in Gaithersburg. Repairs, maintains and replaces furnaces and heat pumps for homes in Frederick, Urbana, Mt. View listing and contact info
Bennett Air Heating and Air Conditioning
Waldorf, MD. Veteran-owned heating and cooling company in Waldorf, operating since 1991. Provides heating maintenance, repair and replacement for homeowners and home warranty customers in Charles, Prince George’s and St. View listing and contact info
T. N. Bowes Heating & Air Conditioning, Inc.
Waldorf, MD. Family-owned heating and cooling company since 1988, with offices in Waldorf and Leonardtown. Services furnaces, boilers, heat pumps and geothermal systems, and handles oil-to-gas conversions across Southern Maryland. View listing and contact info
Before you book: a quick fall heating checklist
- Swap the air filter. A clogged filter is the most common reason a furnace short-cycles or a heat pump struggles on the first cold night.
- Run the heat for 15 minutes before it gets cold. A burning-dust smell for a few minutes is normal; a smell that sticks around is not.
- Test your carbon monoxide detectors if you have any gas appliances, a fireplace or an attached garage.
- Clear leaves and debris from around the outdoor heat pump unit and keep at least two feet of space around it.
- Book a tune-up in October or early November. Most local companies get booked out once the first hard freeze hits.
- Ask about maintenance plans. Many of the companies below offer priority scheduling and waived after-hours fees for plan members.
How to choose an HVAC company
- License and insurance. Maryland requires HVACR contractors to hold a license from the Maryland Board of HVACR Contractors, and Montgomery and Prince George’s counties have their own permit rules for equipment replacements. You can verify a license on the Maryland Department of Labor website.
- Written estimates. Get at least two for any replacement. A good estimate names the equipment brand, model, efficiency rating and what’s included (removal, permits, thermostat, warranty).
- Load calculation. For a new system, the company should size it with a Manual J load calculation, not just match the old unit.
- Emergency service. Ask whether they answer nights and weekends in winter and what the after-hours fee is.
- Warranty and plans. Ask how long labor is covered, and what a yearly maintenance plan costs and includes.
More heating and cooling help in the DMV
See every heating and cooling company on the site in the DMV HVAC directory, or check our guides to the best HVAC companies in Northern Virginia and best HVAC companies in Washington DC. If a cold snap freezes a pipe or your water heater quits, our list of the best plumbers in DC, Maryland and Northern Virginia has you covered. Getting the roof ready too? See our DMV roofers guide.
Run an HVAC company in the DMV that isn’t on this list? Add your business for free.
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