The Ultimate Guide to Maryland HVAC Regulations for Homeowners
Maryland HVAC work is governed by three separate things: state licensing, county permits, and federal efficiency minimums. Most homeowners only discover the second one when a sale falls through.
- Licensing is statewide. The Maryland Board of Heating, Ventilation, Air Conditioning and Refrigeration Contractors, under the Maryland Department of Labor, issues six license classes. Only a licensed contractor may install, repair or maintain your system.
- Permits are county-level. Requirements, fees and turnaround differ by county. In Howard County the permit is issued by the Department of Inspections, Licenses and Permits: a $50.00 application fee plus 10% technology fee, plus $40.00 per heating/cooling zone for single-family homes.
- Efficiency minimums are federal. Since 1 January 2023 the standard is measured in SEER2. Maryland is in the DOE’s North region: 13.4 SEER2 minimum for split-system central air conditioners, 14.3 SEER2 for heat pumps, 80% AFUE for gas furnaces.
- Building codes are state-adopted. Maryland uses the 2021 IECC and 2021 IMC through the Maryland Building Performance Standards.
- Rebates can offset the cost. BGE’s Home Performance with ENERGY STAR program pays up to $10,000 on modelled savings, or up to $15,000 when switching from fossil fuel to a heat pump — capped at 75% of project cost.
This guide is maintained by A-C Air Care LLC, a licensed Maryland HVAC contractor (MD HVAC License #60218) based in Elkridge, serving Howard, Anne Arundel, Baltimore, Prince George’s and Montgomery counties since 2010. Last reviewed: September 30, 2026.
Maryland HVAC Regulations: Permits, Licensing and Efficiency Standards (2026)
Three different authorities regulate the HVAC system in your Maryland home, and they do not talk to each other.
The state decides who is allowed to touch it. Your county decides whether you need a permit and what it costs. The federal government decides the minimum efficiency of anything new you install. A contractor can be perfectly licensed and still leave you with unpermitted work; a system can be permitted and still fail to meet efficiency minimums.
This guide covers all three, with the specific numbers, and notes where the rules change depending on which county you live in.
Who is legally allowed to work on your HVAC system
Only a person holding a current HVACR license from the Maryland Board of Heating, Ventilation, Air Conditioning and Refrigeration Contractors may install, repair or maintain an HVAC system in Maryland. The Board sits under the Maryland Department of Labor. There is no homeowner exemption for the work itself, and there is no “handyman” tier.
The six license classes
Maryland does not issue one HVAC license. It issues six, and the difference matters when you are reading a quote:
| Class | What it permits |
|---|---|
| Master | Installation and maintenance of all HVAC and refrigeration systems |
| Master Restricted | Installation and maintenance of one or more specified types of system |
| Limited Contractor | Maintenance and repair only — no installation — on specified system types |
| Journeyman | Full HVACR work under the supervision of a licensed master |
| Journeyman Restricted | Specified system types, under the direct supervision of a licensed master |
| Apprentice | Work under the direction and control of a licensed master, while training |
What those licenses actually take
The hour requirements are the part worth knowing, because they tell you what the license means:
- Apprentice — no prerequisites. This is the entry point.
- Journeyman — at least four years licensed as an apprentice, including a minimum of 6,000 hours of supervised HVACR work.
- Master — at least three years of active experience as a journeyman under a master’s direction, a minimum of 1,875 hours worked in the year immediately before applying, and a passing score of 70% on the master examination.
A master license therefore represents a minimum of roughly seven years of documented, supervised work before the exam is even taken.
How to check a contractor’s license before you sign
Ask for the license number and the class, then verify it directly with the Maryland Department of Labor’s license lookup. A contractor who will not give you a number in writing is telling you something.
What to do with this: if you are being quoted for an installation, confirm the license is Master or Master Restricted covering your system type. A Limited Contractor license does not cover installation, and work done outside a license class is unpermittable — which surfaces at resale, not at install.
A-C Air Care holds Maryland HVAC License #60218. We are also a certified Minority Business Enterprise (MBE #15-541), which matters for Howard County institutional and commercial contracts.
Permits: what triggers one, what it costs, how long it takes
Most HVAC replacement work in Maryland requires a county permit, and permits are pulled by your contractor, not by you. Requirements and fees are set county by county — there is no single statewide HVAC permit.
What triggers a permit
Howard County’s published criteria are the clearest statement of the pattern, and the other counties in our service area follow it closely. A permit is required for:
- HVAC installations in new construction
- Any conversion of electric to another energy source
- Additions and alterations that require installation of new HVAC systems
- Replacement HVAC equipment when gas- or oil-fired — or when a geothermal tax credit is being sought, regardless of energy source
Read that last bullet carefully, because it is the one that catches people. A like-for-like gas furnace swap is replacement work, and it still needs a permit. So does a heat-pump replacement if you intend to claim a geothermal credit.
Minor repairs and routine maintenance — a capacitor, a blower motor, a coil clean — generally do not require a permit. Confirm with your county before assuming. If your system just needs a repair rather than a full replacement, our AC repair team can typically help without any permit involved.
Permit costs and turnaround by county
| County | Issuing office | Application cost | Typical turnaround |
|---|---|---|---|
| Howard | Department of Inspections, Licenses and Permits (DILP) | $50.00 application fee (+10% technology fee), plus $40.00 per heating/cooling zone for single-family homes ($80 per unit for multi-family) | 1–3 weeks (state portal range: 1–30 days) |
| Anne Arundel | Department of Inspections and Permits | $43.00 non-refundable application fee + $51.00 minimum mechanical permit fee | Varies by project — Contact Permit Center for estimate |
| Baltimore County | Department of Permits, Approvals and Inspections (PAI) | 57–506, size-based (under 4,000 sq ft: $34 base; all others: $85 base; $57 minimum; $506 maximum) | General building permit range only: 10–30 days (not mechanical-specific) |
| Prince George’s | Department of Permitting, Inspections and Enforcement (DPIE) | $86.00 minimum (or 1.3% of mechanical construction cost, whichever is higher) + $66.00 administrative fee, plus 10% technology fee | General plan review cycle: ~4–6 weeks (official DPIE FAQ; may not reflect simple standalone HVAC replacement) |
| Montgomery | Department of Permitting Services (DPS) | $80.84 minimum (residential one/two-family), plus separate equipment fees: $28.61 per 100 MBH for heating equipment, $28.61 per 5-ton capacity for cooling equipment | Immediate for one-for-one replacements; 3 business days if plan review required |
The four steps
- Application — your contractor submits equipment details, load calculations and, for new construction, mechanical plans.
- Fee — scales with scope. Some counties charge per heating/cooling zone rather than a flat rate.
- Review — days to weeks depending on county and complexity.
- Inspection — after the work is finished, an inspector verifies compliance and closes the permit out.
The permit is not closed until step 4 happens. An open permit is a live defect on your property record, and it is the single most common HVAC problem discovered during a home sale.
Efficiency minimums your new system must meet
Since 1 January 2023, HVAC efficiency in the United States has been measured using SEER2, EER2 and HSPF2 — not the older SEER, EER and HSPF ratings. The test procedure changed to reflect real-world static pressure, so the numbers are not interchangeable. If a quote cites plain “SEER”, the equipment data is out of date, the quote is out of date, or both.
Maryland’s minimums
Maryland sits in the DOE’s North region, which has a lower cooling-season minimum than the South and Southwest:
| Equipment | Minimum | Note |
|---|---|---|
| Split-system central air conditioner | 13.4 SEER2 | North region. Equivalent to the previous 14.0 SEER |
| Air-source heat pump | 14.3 SEER2 | National minimum — no regional variation |
| Non-weatherized gas furnace | 80% AFUE | Federal minimum |
The North/South split matters if you are comparing quotes or equipment against national content. The South and Southwest minimum for split-system air conditioners is 14.3 SEER2 — higher than Maryland’s. Equipment that fails to meet the standard in Georgia may still be legal here, which is why national buying guides can be misleading in this market.
Building codes
Maryland adopts building and mechanical codes at state level through the Maryland Building Performance Standards. New code editions are formally adopted by the Department of Housing and Community Development, while the standards themselves are administered under the Maryland Department of Labor’s Building Codes Administration. The current baseline incorporates the 2021 International Energy Conservation Code (IECC) and the 2021 International Mechanical Code (IMC), alongside the National Electrical Code for electrical connections.
Counties may amend on top of the state standard, so the state edition is your floor, not necessarily your final answer.
Sizing
Efficiency ratings describe the equipment. They do not describe the installation. A 16 SEER2 system that is two tons oversized will short-cycle, dehumidify poorly, and cost more to run than a correctly sized 13.4 SEER2 unit — which matters in Maryland, where summer humidity, not peak temperature, is usually the comfort problem.
Correct sizing requires a Manual J load calculation using your home’s square footage, insulation, window area, orientation and air-sealing. Ask whether a Manual J was performed. “We’ll match what’s there” is not a load calculation, and the existing unit may have been wrong for twenty years.
What the codes require vs. what your warranty requires
Maryland does not legally mandate annual HVAC maintenance for homeowners. This is widely misstated. What creates the obligation is your manufacturer’s warranty, and nearly every major manufacturer voids coverage on systems without documented annual professional service.
The practical distinction:
| Required by | Consequence of skipping | |
|---|---|---|
| Filter changes (30–90 days) | Nobody — best practice | Reduced efficiency, worse air quality |
| Annual professional inspection | Manufacturer warranty terms | Warranty voided — you pay for covered failures |
| Refrigerant handling | Federal law (EPA Section 608) | Illegal to perform unlicensed |
| Permitted repair work | County code | Open permit on the property record |
Refrigerant is the one with real legal teeth: EPA certification is required to purchase or handle it, which is why refrigerant work cannot legally be a DIY job regardless of skill.
The five compliance failures that cost Maryland homeowners money
Listed in order of what they typically cost:
- Unpermitted replacement discovered at resale. A gas furnace or AC replaced without a permit shows up during the buyer’s inspection or title review. Retroactive permitting means opening walls, re-inspection, and in some cases replacing non-compliant work — during a live transaction, with a closing date.
- Warranty voided by undocumented maintenance. A compressor failure in year six on a ten-year warranty, denied for lack of service records. Four-figure repair, entirely avoidable.
- Oversized equipment. Short-cycling, poor humidity control, shortened compressor life. Locked in on install day and effectively uncorrectable without replacing the unit.
- Work performed outside a license class. An installation done by a Limited Contractor cannot be permitted. It also may not be insurable.
- Rebates missed by sequencing. Most Maryland efficiency rebates require pre-approval or an assessment before installation. Install first and the money is gone — see below.
Rebates you can stack in the BGE and PEPCO territories
Maryland’s EmPOWER programs, delivered through BGE, PEPCO and Delmarva Power, can cover a substantial share of a heat pump project — but the money is sequenced, and most of it is claimed before installation, not after.
Home Performance with ENERGY STAR
Effective 1 May 2025, the program pays:
- Up to $10,000 based on modelled energy savings
- Up to $15,000 where the project switches a combustion furnace, boiler or water heater to a qualifying electric heat pump or heat pump water heater
- Capped in both cases at 75% of total project cost
The higher tier is a fuel-switching incentive: it rewards removing combustion equipment, not simply upgrading efficiency. If you are replacing an aging gas furnace and were already considering a heat pump, that decision is worth materially more under this program than it was before May 2025.
No-cost HVAC tune-up
BGE offers eligible residential customers a no-cost HVAC or AC tune-up, which includes a report identifying qualifying improvements — the assessment that often unlocks the larger rebates above.
Sequence matters
The order is: assessment → approval → installation → claim. Reversing it forfeits the incentive. This is the most expensive mistake on this page, and it is entirely procedural.
A-C Air Care is a participating contractor in the BGE and PEPCO tune-up programs.
Frequently asked questions
Do I need a permit to replace my air conditioner in Maryland?
It depends on the equipment. In Howard County a permit is required for replacement HVAC equipment that is gas- or oil-fired, or for any replacement where a geothermal tax credit is being claimed regardless of energy source. Requirements are set county by county — confirm with your county’s permitting office.
How much does an HVAC permit cost in Howard County?
The application fee is $50.00, per the Maryland OneStop listing for the Howard County Department of Inspections, Licenses and Permits, plus a 10% technology fee. Single-family homes also pay $40.00 per heating/cooling zone ($80.00 per unit for multi-family).
Can I pull my own HVAC permit as a homeowner in Maryland?
Permit-pulling rules vary by county. Most Maryland jurisdictions require the licensed contractor performing the work to pull and close out the permit, though some counties — including Montgomery — offer a formal homeowner exemption process for owner-occupied single-family homes. Confirm with your specific county before assuming either way.
What SEER rating do I need in Maryland?
Maryland is in the DOE’s North region. The minimum for a new split-system central air conditioner is 13.4 SEER2; for an air-source heat pump it is 14.3 SEER2 nationally. Ratings changed from SEER to SEER2 on 1 January 2023 and the two scales are not interchangeable.
What licence should my HVAC contractor hold?
For installation work, a Master or Master Restricted licence from the Maryland Board of HVACR. A Limited Contractor licence covers maintenance and repair only and does not permit installation.
How long does a Maryland HVAC permit take to approve?
Review times vary by county and by project complexity, from a few days for a straightforward replacement to several weeks for new construction. Contact your county’s permitting office for current timeframes.
Is annual HVAC maintenance legally required in Maryland?
No. Maryland does not legally require homeowners to maintain their HVAC systems. Most manufacturer warranties, however, require documented annual professional service and will deny claims without it.
What building code does Maryland use for HVAC?
Maryland adopts codes through the Maryland Building Performance Standards. New editions are formally adopted by the Department of Housing and Community Development, while the standards are administered under the Maryland Department of Labor’s Building Codes Administration. The current baseline incorporates the 2021 IECC and 2021 IMC. Counties may adopt local amendments.
Primary sources
| Topic | Authority | What to check there |
|---|---|---|
| Licensing, license classes, license lookup | Maryland Board of HVACR, Maryland Department of Labor | Verify a contractor’s licence number and class |
| Building and mechanical codes | Maryland Building Performance Standards (DHCD — adoption; MD Dept. of Labor — administration) | Current adopted IECC/IMC editions |
| Permits — Howard County | Howard County Department of Inspections, Licenses and Permits | Fees, forms, inspection scheduling |
| Permits — all Maryland | Maryland OneStop | Statewide permit and licence listings |
| Federal efficiency standards | U.S. Department of Energy | Current SEER2 / EER2 / HSPF2 minimums by region |
| Rebates | BGE Smart Energy · PEPCO Home Energy Savings | Current program amounts and eligibility |
| Refrigerant handling | U.S. EPA, Section 608 | Technician certification requirements |
Reviewed by Jaime, Owner, A-C Air Care LLC. A-C Air Care is a licensed Maryland HVAC contractor (MD HVAC License #60218) and certified Minority Business Enterprise (MBE #15-541), based in Elkridge, Maryland and serving Howard, Anne Arundel, Baltimore, Prince George’s and Montgomery counties since 2010.
Last reviewed: September 30, 2026. Regulations, fees and rebate amounts change — verify current figures with the authority before relying on them.