No heat or no cooling right now?
If you smell gas or a carbon monoxide alarm sounds, leave first and call 911 or your gas utility from outside. Otherwise, call a company below that says it takes emergency calls. Quick checks first: AC not cooling · furnace not working.
The list
Baltimore HVAC companies, A to Z
Filter by what each business says on its own website. “Says 24/7 emergency” means its site says so – call to confirm before you rely on it.
Your HVAC company, Baltimore
The one City Spotlight place for Baltimore sits here, above the A to Z list. Requests sent from this page for areas the Spotlight company serves go to it. Offered only to companies that pass our listing rules. How it works
A-C Air Care LLC
Based in Elkridge, MD
Names on its website: Baltimore, Catonsville, Clarksville, Columbia, Ellicott City, Glen Burnie, Laurel, Odenton, Olney, Pasadena and more
License number shown on its website: #60218
ABC Cooling & Heating
Based in Dundalk, MD · 4030 North Point Blvd, Dundalk, MD 21222
Names on its website: Baltimore, Middle River, Essex
License number shown on its website: MD-HVAC-02-5581; MD-MHIC-01-164544
Ambient Cooling & Heating
Based in Ellicott City, MD · 4950 Dorsey Hall Dr, Ellicott City, MD 21042
Names on its website: Severn, Severna Park, Columbia, Annapolis, Pasadena, Crofton, Davidsonville, Glen Burnie, Bowie, Odenton and more
At Your Service Heating & Cooling LLC
Based in Baltimore, MD · 6801 Eastern Avenue, Suite 209, Baltimore, MD 21224
License number shown on its website: License #57444
Beltway Air Conditioning and Heating
Based in Severn, MD · 8141 Telegraph Rd Suite I, Severn, MD 21144
Names on its website: Hanover, Columbia, Ellicott City, Anne Arundel County, Howard County, Baltimore County
License number shown on its website: #82458
Carroll Mechanical
Based in Columbia, MD · 8300 Guilford Rd, Suite D, Columbia, MD 21046
Names on its website: Ellicott City, Elkridge, Bethesda, Rockville, Silver Spring, Gaithersburg, Germantown, Potomac, Chevy Chase, Clarksburg and more
License number shown on its website: 127439
Clean Air Heating & Air Conditioning Co., Inc.
Based in Baltimore, MD · 1911 Portal Street, Baltimore, MD 21224
Names on its website: Dundalk, Canton, Edgemere, Essex, Severna Park, Millersville, Pasadena, Severn, Lutherville-Timonium, Hunt Valley and more
Farnen & Dermer
Based in Owings Mills, MD · 10500 Reisterstown Rd, Owings Mills, MD 21117
Names on its website: Baltimore County, Central Maryland
License number shown on its website: #9402, #1600, #871
Future Tech Heating & Cooling Co.
Based in Baltimore, MD · 2826 Pinewood Ave, Baltimore, MD 21214
Names on its website: Parkville, Hamilton, Towson, Perry Hall, Lutherville, Timonium, Carney, Cockeysville, Reisterstown, Owings Mills and more
License number shown on its website: Maryland Master HVAC License #4441
Hughes Mechanical, LLC
Based in Essex, MD · 820 Eastern Blvd, Essex, MD 21221
Names on its website: Abingdon, Baltimore, Bel Air, Cockeysville, Lutherville-Timonium, Nottingham, Parkville, Perry Hall, Towson
License number shown on its website: #81818, #78238, #M12097
ITB Heating & Air Conditioning
Based in Ellicott City, MD
Names on its website: Columbia, Crofton, Glen Burnie, Montgomery County
Modern Comfort Systems
Based in Essex, MD · 1401 E Homberg Ave, Essex, MD 21221
Names on its website: Baltimore, Ellicott City, Westminster, Frederick, Hagerstown
License number shown on its website: MD 06126564 & PA 005725
Pipco A/C & Heating Co. Inc.
Based in Lutherville Timonium, MD · 26 West Aylesbury Road, Lutherville Timonium, MD 21093
Names on its website: Lutherville, Timonium, Towson, Baltimore County, Baltimore City, Harford County, Carroll County, Howard County, Anne Arundel County
Reliability Home Services
Based in Dundalk, MD · 4030 North Point Boulevard, Dundalk, MD
Names on its website: Canton, Hampden, Towson, Essex, Middle River, Parkville, Perry Hall, Catonsville, Columbia, Glen Burnie and more
License number shown on its website: MD HVAC MASTER 12066; MD HVAC MASTER 63026; MD HOME IMPROVEMENT COMMISSION 102008; Harford County HVAC Master 00000764-M
S&L Prime A/C & Heating Systems, Inc.
Based in Glen Arm, MD · 12076 Glen Arm Rd, Glen Arm, MD 21057
Names on its website: Baltimore, Towson, Catonsville, Perry Hall, White Marsh, Bel Air, Timonium, Dundalk, Cockeysville, Owings Mills and more
SG Heating & Cooling, Inc.
Based in Columbia, MD
Names on its website: Ellicott City, Laurel, Elkridge, Catonsville, South Laurel, Arbutus, Severn, Fairland, Milford Mill, Olney and more
License number shown on its website: NATE License #3478360; HVAC Licenses #87065 & #55590
Smith & Company HVAC
Based in Crownsville, MD · 1211 St Stephens Church Rd, Crownsville, MD 21032
Names on its website: Annapolis, Arnold, Catonsville, Crofton, Edgewater, Glen Burnie, Pasadena, Severna Park, Baltimore City, Howard County
Details on this page come from each business’s own website, checked October 2026. Free listings are shown alphabetically. How we list · Update or remove a listing
Before you hire
Checking an HVAC company in the Baltimore area
HVAC licenses in Maryland
HVAC contractors are licensed by the state.
License types: Master License, Master Restricted License, Limited License, Journeyman License, Journeyman Restricted License, Apprentice License.
Companies: Under Business Regulation Article 9A-301, an individual must be licensed by the Board before providing or assisting in providing heating, ventilation, air-conditioning or refrigeration services in Maryland. Contracting businesses work under a Master (all HVACR areas), Master Restricted (selected areas) or Limited (maintenance and repair only) license.
Check a license: dllr.state.md.us
Search the company's license on the Board's license search and make sure the license class (Master, Master Restricted or Limited) matches the work you are hiring them to do.
Federal rule: in every state, technicians who handle refrigerant must hold EPA Section 608 certification, whatever the state or city requires.
Sources: labor.maryland.gov, labor.maryland.gov, labor.maryland.gov, mgaleg.maryland.gov. Checked October 2026 from official sources. This is not legal advice.
Questions to ask
Ask every company the same questions: license number, insurance, EPA refrigerant certification, a written itemized estimate, a load calculation for new equipment, after-hours rates, who pulls the permit, and the warranty. All eight questions.
Seasonal care
Year-round care in Baltimore
Baltimore homes lean on both heating and cooling, so each system needs a check before its season: cooling in spring, heating in fall.
Questions
Baltimore HVAC questions
How many HVAC companies are listed in Baltimore?
17 HVAC companies, each based within about 25 miles of Baltimore. They are listed alphabetically.
Which Baltimore HVAC companies say they offer 24/7 emergency service?
8 of the businesses listed here say on their own website that they offer 24/7 or 24-hour emergency service: ABC Cooling & Heating, At Your Service Heating & Cooling LLC, Beltway Air Conditioning and Heating, Future Tech Heating & Cooling Co., Hughes Mechanical, LLC, Reliability Home Services, S&L Prime A/C & Heating Systems, Inc., Smith & Company HVAC. Call to confirm availability and after-hours rates.
Do HVAC contractors in Baltimore need a license?
Maryland licenses HVAC contractors statewide through the Maryland State Board of Heating, Ventilation, Air-Conditioning and Refrigeration (HVACR) Contractors (Dept. of Labor, Division of Occupational and Professional Licensing). Check a license at dllr.state.md.us.
Which Baltimore companies work on heat pumps?
17 of the listed businesses say on their own website that they install or repair heat pumps. Use the Heat pumps filter above the list.
Which HVAC companies here do commercial work?
13 of the listed businesses say on their own website that they work on commercial properties. Use the Commercial filter above the list.
Do technicians need EPA certification?
Yes: federal rules require technicians who handle refrigerant to hold EPA Section 608 certification, in every state. Ask any company you are considering.
Nearby metro areas: Washington, DC · Philadelphia, PA · Pittsburgh, PA · Virginia Beach, VA · Richmond, VA · Charleston, WV · Wilmington, DE · Allentown, PA. All of Maryland.
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No heat in freezing weather, or no cooling in dangerous heat? Call a company from the list that says it takes emergency calls – a form is not fast enough. If you smell gas or a carbon monoxide alarm sounds, leave first and call 911 or your gas utility from outside.