HVAC contractor insurance in Maryland

What Maryland's HVACR license makes you carry

Maryland licenses HVACR work statewide and writes the insurance into the statute. A master, master restricted or limited licensee can't contract for work unless it's covered by at least $300,000 of general liability and $100,000 of property damage insurance, and that coverage has to include completed operations.

Who licenses the work. The State Board of Heating, Ventilation, Air-Conditioning, and Refrigeration Contractors, part of the Maryland Department of Labor, runs the program under Business Regulation Title 9A. The license types are:

• Master: all HVACR services.
• Master Restricted: one area only, such as forced-air heating, hydronic heating, ventilation, air conditioning or refrigeration.
• Limited: maintenance and repair only, for one or more system types.
• Journeyman and Journeyman Restricted: work under the direction and control of a licensed contractor.
• Apprentice: assists a licensed contractor while training.

Everyone on the job holds a license. An individual must be licensed before providing, or even assisting in, HVACR services anywhere in the state, so apprentices are licensed too. There's no dollar threshold. Exemptions include homeowners working on their own single-family home, public-utility employees, master electricians on electric resistance heat and an owner's regular maintenance staff.

The insurance rules in §9A-402:

• $300,000 general liability and $100,000 property damage, covering the work including completed operations: the injury or damage that traces back to a job months after you closed it out.
• Who buys it. The licensee or the HVACR business that employs the licensee.
• Proof up front. No license issues or renews without proof of coverage.
• Cancellation notice. The licensee must tell the board at least 10 days before a cancellation takes effect.
• Journeymen and apprentices working under a master's control don't need their own policy.
• No state bond. If a county or city requires a surety bond under local HVACR rules, proof of this insurance can satisfy it.

Each license even states whether its holder meets the insurance requirement. Confirm the current amounts with the Maryland State Board of HVACR Contractors.

Related licenses. Licensed HVACR contractors working within their license, or installing a central heating or air-conditioning system, don't need a Maryland Home Improvement Commission license. In Montgomery and Prince George's counties, gas work like furnace and gas water heater replacements must be done by a WSSC Water licensed gasfitter under WSSC permits.

Refrigerants. Maryland has its own HFC rule, COMAR 26.11.33, which restricts certain HFCs in chillers and stationary refrigeration. It reaches anyone who sells, installs or uses those substances in the state; check the regulation for which ones and when. Federal EPA Section 608 certification applies to every tech who opens a system.

Maryland workers' comp and the heat rule for attic crews

Maryland presumes anyone working under a contract of hire or apprenticeship is a covered employee unless you prove independent-contractor status. Your licensed journeymen and apprentices may not need their own liability policy, but they are employees for comp.

1099 installers. The Workplace Fraud Act, which applies to construction and landscaping services, presumes paid work creates an employment relationship unless the employer proves an ABC-style test (Labor and Employment §3-903). You'd have to show three things: the installer is free from your control, he's customarily in an independent business of the same kind, and the work is either outside your usual course of business or done away from your office or headquarters. How a 1099 installer fares under that test is a question for your attorney.

Owners. Paid corporate officers and LLC members are covered employees, but some may opt out. That includes officers of close corporations, up to five officers of other corporations, and LLC members holding 20% or more of the profits interests. Opting out takes a written notice sent to both the commission and the insurer.

Penalties. An employer that skips comp commits a misdemeanor punishable by as much as $5,000, a year of jail time, or both. When the employer is a corporation, liability lands on the officer who runs its general management.

Heat. Maryland's heat stress standard, COMAR 09.12.32, has been in effect since September 30, 2024. It applies at a heat index of 80°F, indoors and outdoors, and calls for a written plan, water, rest, shade and acclimatization. Summer attics are indoor work, so it reaches your install crews. Heat illness is a comp claim, and underwriters may ask about your plan. Maryland is an NCCI state, so HVAC payroll typically rates under class 5537. Filings and exemption forms are with the Maryland Workers' Compensation Commission, and our comp guide for HVAC contractors covers audits.

Maryland risks behind HVAC premiums

Finished work that fails later

Maryland stands out for spelling out that license insurance must cover completed operations. That's the exposure from a condensate overflow or a failed flue connection months after you leave. Completed-operations claims are paid from their own aggregate, and with an occurrence policy, the policy in force when the damage happens is the one that responds. Keep coverage continuous when you change carriers.

Gas appliance swaps in the WSSC area

In Montgomery and Prince George's counties, furnace and other gas appliance replacements need a WSSC licensed gasfitter and a WSSC permit. A crew that swaps a gas furnace without the right license or permit invites enforcement, and it can complicate a claim if something goes wrong.

The new apartment air-conditioning law

Chapter 664 of 2026 requires landlords to provide air conditioning in rental units in buildings of 10 or more units. It applies from June 1, 2026 to newly built units and to units that have had air conditioning since January 1, 2025, and from October 1, 2026 to units renovated with replacement or substantial upgrade of electrical or heating systems. From June 1 through September 30, the system must be able to hold each habitable space at no more than 80°F. A furnace or heating replacement in a larger building can now bring a cooling job with it, which means bigger projects, more equipment on site and more contract terms to read.

Example scenario: A Baltimore shop bids a heating upgrade in a 24-unit building. The owner adds cooling to meet the new law, and the job doubles. The shop's installation floater limit was set for single-family change-outs and doesn't stretch to 24 condensers sitting on site.

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Maryland HVAC markets we serve

What shapes HVAC insurance costs in Maryland

Maryland quotes move on these factors:

• Your license type. A master doing installs carries different exposure than a limited licensee doing maintenance and repair.
• Completed-operations exposure. Years of furnace and heat pump installs build up exposure, and the license requires it to be covered.
• Licensed headcount. Every apprentice and journeyman is on comp payroll.
• Apartment work. Larger buildings under the new AC law mean bigger jobs and higher limits in contracts.

What you pay depends on your payroll by class code, your annual revenue, your mix of installation and service work, residential versus commercial jobs, the vans you run, your claims history and the limits you pick. See the HVAC insurance cost guide for published ranges.

The license behind our Maryland quotes

HVAC Insurance Group is a brand of The Allen Thomas Group, licensed in Maryland (License #3003445098, NPN 7642818).

Each Maryland request, from a limited-license service tech to a master-led install shop, gets a licensed agent checking that the policy meets the board's rule before you bind.