How to Start an HVAC Business in Mississippi (2026)

Last updated: May 4, 2026

Mississippi’s HVAC licensing framework is built around the Mississippi State Board of Contractors (MSBOC) and a tiered dollar threshold system that determines when a license is required. Residential remodeling HVAC work reaching $10,000 triggers the MSBOC license requirement. Commercial HVAC work and new residential construction reach the licensing threshold at $50,000. Below those thresholds, state licensure from MSBOC is not required, though local permits still apply. The license classifications relevant to HVAC contractors are Mechanical Contractor and Air Conditioning and Refrigeration Contractor, both of which require passing two open-book PSI exams – the Law and Business Management exam and the trade-specific exam – at a minimum score of 70%. Contact MSBOC at 800-880-6161 or 601-354-6161, or visit msboc.us.

The Mississippi HVAC market is defined by extreme summer heat – Jackson averages a 91-degree high in July, and the Gulf Coast humidity amplifies that demand – combined with the Gulf Coast’s hurricane rebuild legacy from Katrina in 2005, which reconstructed most coastal commercial and residential infrastructure and created a durable market for HVAC service, replacement, and installation work. Major institutional clients along the Coast include Keesler Air Force Base in Biloxi and NASA’s John C. Stennis Space Center in Hancock County. Inland, Tupelo’s Toyota Motor Manufacturing Mississippi plant and USM’s campus in Hattiesburg represent significant commercial HVAC accounts. Overlaid on all of this is the federal AIM Act transition away from R-410A to A2L refrigerants (R-32 and R-454B), which requires updated technician training, new handling protocols, and equipment investment beginning in 2025-2026.

Mississippi HVAC Business Requirements at a Glance

Requirement	Mississippi Rule
MSBOC License – Residential Remodeling	Required at $10,000+ project value; Mechanical Contractor or AC and Refrigeration Contractor classification
MSBOC License – Commercial and New Residential	Required at $50,000+ project value
PSI Exams Required	Two open-book exams: (1) Law and Business Management + (2) HVAC trade exam; 70% passing score each
General Liability Insurance – Residential	$500,000 per occurrence minimum; MSBOC as certificate holder
General Liability Insurance – Commercial	$1,000,000 per occurrence minimum; MSBOC as certificate holder
Surety Bond	$10,000 for residential classifications
EPA 608 Certification	Required (federal); all refrigerant handlers including A2L types
State Business Formation	LLC $53 online at business.sos.ms.gov; annual report free due April 15
Local Business Privilege License	Required from city/county clerk (no state business license in MS)
Workers Compensation	Required at 5+ employees; NCCI code 5183; private market
HVAC Labor Taxability	Labor on real property improvements generally not taxable; parts/equipment taxable at 7%
MSBOC Contact	800-880-6161 / 601-354-6161 / msboc.us

How to Start an HVAC Business in Mississippi (Step by Step)

Step 1: Determine Whether You Need an MSBOC License

The Mississippi State Board of Contractors (MSBOC) administers contractor licensing for HVAC work in Mississippi. Whether you need an MSBOC license depends on the dollar value of the projects you intend to perform. For residential remodeling projects, the MSBOC licensing threshold is $10,000 – any single HVAC contract at or above that amount on an existing residential structure requires a valid MSBOC license. For commercial projects and for new residential construction (building new homes rather than remodeling existing ones), the threshold is $50,000. If you plan to work exclusively on smaller residential service calls and repairs below $10,000, you are not required to hold an MSBOC license at the state level, though local permits and inspections may still apply depending on your city or county.

The two MSBOC license classifications most relevant to HVAC contractors are the Mechanical Contractor license (covering heating, ventilation, and air conditioning systems as mechanical systems) and the Air Conditioning and Refrigeration Contractor license. Review both categories at msboc.us or by calling MSBOC at 800-880-6161 to determine which classification best matches your intended scope of work. Some contractors hold both classifications to maximize the range of projects they can bid.

Step 2: Pass the Two Required PSI Exams

MSBOC requires all applicants to pass two open-book PSI exams before a contractor license will be issued. The first exam is the Law and Business Management exam, which covers Mississippi contractor law, lien rights, contract requirements, business management principles, and MSBOC administrative rules. The second exam is the HVAC trade exam specific to your license classification – it covers the technical knowledge required for mechanical contracting or air conditioning and refrigeration contractor work. Both exams require a minimum passing score of 70%.

Both exams are open-book, meaning you can bring reference materials. Many applicants study using the MSBOC-approved reference materials list and practice exams available through PSI Exams Online, where you also schedule your exam sittings. You must pass both exams before MSBOC will process your license application. If you fail one exam, you may retake it; contact PSI for retake scheduling and fee information. There is no requirement that you pass both exams in the same sitting.

Step 3: Secure General Liability Insurance and the Surety Bond

Mississippi MSBOC has specific insurance minimums that differ by license classification type. For residential HVAC contractor classifications, MSBOC requires at least $500,000 per occurrence in commercial general liability (GL) insurance. For commercial HVAC contractor classifications, the minimum is $1,000,000 per occurrence. In both cases, MSBOC must be named as the certificate holder on your certificate of insurance – this means your insurance carrier will send MSBOC a copy of the certificate and must notify MSBOC if the policy is cancelled or lapses.

In addition to GL insurance, residential contractor classifications require a $10,000 surety bond. The surety bond is a financial guarantee that protects customers if you fail to complete contracted work or violate contractor regulations. Surety bonds for a $10,000 limit typically cost $100-$300 per year depending on your credit history and the bonding company. Obtain both the insurance certificate and the bond before submitting your MSBOC application – incomplete applications will delay processing. Contact MSBOC at 601-354-6161 to confirm the current requirements, as minimum amounts can be updated.

Step 4: Obtain EPA 608 Certification

EPA 608 certification is a federal requirement that applies nationwide, including in Mississippi. Under Section 608 of the Clean Air Act, any technician who purchases, handles, recovers, or recycles regulated refrigerants must be certified by an EPA-approved testing organization. There are four certification types: Type I (small appliances), Type II (high-pressure systems including most residential AC), Type III (low-pressure systems), and Universal (all types). Most HVAC technicians pursue Universal certification to cover all equipment types.

EPA 608 certification does not expire, but technicians must stay current on the refrigerant types they are certified to handle. The A2L refrigerant transition under the federal AIM Act (see Step 5 below) does not require a new certification category but does require updated safety training because A2L refrigerants (R-32 and R-454B) have mild flammability characteristics not present in R-410A. Get EPA 608 certified through an EPA-approved organization before purchasing or handling any regulated refrigerants. Uncertified purchase or release of regulated refrigerants can result in significant federal penalties.

Step 5: Understand the A2L Refrigerant Transition

The federal AIM Act (American Innovation and Manufacturing Act) is phasing out high-global-warming-potential refrigerants including R-410A and replacing them with lower-GWP A2L alternatives. The primary A2L refrigerants entering the Mississippi market are R-32 (used in many split systems and mini-splits) and R-454B (used in larger residential and commercial equipment). Equipment manufacturers transitioned to A2L-compatible systems on a phased schedule, with key deadlines in January 2025 and January 2026 depending on equipment type and tonnage. R-410A equipment can continue to be installed from existing inventory through December 31, 2025.

A2L refrigerants are classified as mildly flammable (ASHRAE safety classification A2L) and require additional handling precautions compared to R-410A, which is non-flammable. Mississippi HVAC contractors need to update their technician training to cover A2L safety protocols, invest in leak detection equipment appropriate for mildly flammable refrigerants, and ensure recovery and charging equipment is compatible with the new refrigerant types. The Gulf Coast’s high volume of post-Katrina construction means a significant portion of existing HVAC equipment in the Gulfport-Biloxi-Bay St. Louis corridor is approaching or past its useful life, creating a large replacement market that will increasingly involve A2L-equipped systems.

Step 6: Form Your Business Entity and Register for Mississippi Taxes

Form your HVAC business as an LLC at business.sos.ms.gov for $53 total ($50 Certificate of Formation plus $3 online fee). The annual report is free and due April 15. Get a federal Employer Identification Number (EIN) at IRS.gov at no cost. Then register for Mississippi taxes at the TAP portal (tap.dor.ms.gov).

Mississippi Tax Treatment of HVAC Contracts

The tax treatment of HVAC work in Mississippi depends on how the contract is structured. Labor performed as part of a real property improvement is generally not subject to Mississippi’s 7.0% state sales tax. However, HVAC parts and equipment – including condensing units, air handlers, ductwork, thermostats, refrigerant, and other materials – are taxable. In a lump-sum contract, the contractor typically owes sales tax to the supplier on all materials purchased. In a time-and-materials contract, the taxability can depend on whether materials are separately itemized. The Mississippi Department of Revenue’s TAP portal and published guidance should be reviewed for your specific contract structure, or consult a Mississippi tax professional familiar with contractor sales tax rules.

Mississippi Income Tax Phase-Down for HVAC Business Owners

As a pass-through business owner, your HVAC business profits flow through to your personal Mississippi income tax return. The state income tax rate in 2026 is 0% on the first $10,000 and 4.0% on income above $10,000. That rate drops to 3.75% in 2027, 3.5% in 2028, 3.25% in 2029, and 3.0% in 2030 under the legislatively scheduled phase-down in HB 531 of 2022 and HB 1 of 2025. For a profitable HVAC owner earning $150,000 through the business, the declining rate means meaningfully lower state tax each year through 2030.

Step 7: Obtain Your Local Business Privilege License

Mississippi has no general state business license. Before operating your HVAC business, obtain a Business Privilege License from the city or county clerk where your business is located. Contact your local government office directly for the application, fee amount, and renewal date. If you work across multiple jurisdictions – common for Gulf Coast HVAC contractors who work across Harrison, Hancock, and Jackson counties – you may need a Business Privilege License in each location where you have a business presence, depending on local rules. Some jurisdictions also require a separate local contractor registration or permit beyond the state MSBOC license.

Step 8: Set Up Workers Compensation, Payroll, and New Hire Reporting

Mississippi requires workers compensation insurance when your HVAC business reaches 5 or more employees. Below that threshold, coverage is not required by state law, though you may choose to carry it. When you do need coverage, obtain it through the private insurance market. The NCCI classification code for HVAC work is 5183 (Plumbing, Heating, and Cooling Contractors). Workers comp premiums for HVAC technicians reflect moderate-to-elevated injury risk due to ladder work, confined spaces, electrical hazards, and heat exposure on Gulf Coast job sites during summer months.

Register with the Mississippi Department of Employment Security (mdes.ms.gov) for unemployment insurance before your first payroll. New employer UI rates are 1.0% in year 1, 1.1% in year 2, and 1.2% in year 3 and beyond, on a taxable wage base of $14,000 per employee per year. Report every new hire to the Mississippi New Hire Reporting Center within 15 days of the hire date at ms-newhire.com. There is no state minimum wage in Mississippi – the federal $7.25 per hour applies – and no state paid family or medical leave mandate. Mississippi is a Right-to-Work state under Miss. Code Section 71-1-47.

Mississippi Gulf Coast HVAC Market Context

The Gulf Coast region – centered on Harrison County (Gulfport-Biloxi) and extending into Hancock County (Bay St. Louis, Waveland, Stennis Space Center) and Jackson County (Pascagoula) – represents Mississippi’s highest-density HVAC market. Hurricane Katrina in August 2005 caused catastrophic damage across the Coast, with the storm surge destroying or severely damaging virtually all coastal structures in Hancock and parts of Harrison County. The rebuild following Katrina replaced most coastal residential and commercial HVAC infrastructure between 2006 and 2012. Much of that replacement equipment is now approaching the end of its 15-20 year typical service life, creating a substantial near-term replacement cycle.

Casino properties on the Coast – Beau Rivage/MGM, Hard Rock Hotel and Casino, IP Casino Resort Spa, and Golden Nugget Biloxi – are large institutional HVAC customers operating 24 hours a day, 365 days a year, with highly demanding maintenance and emergency service requirements. Keesler Air Force Base in Biloxi contracts significant HVAC maintenance and installation work through federal procurement, typically requiring contractors to navigate federal acquisition regulations and security procedures in addition to state licensing. NASA’s John C. Stennis Space Center in Hancock County has both large test facility HVAC demands and support infrastructure requiring licensed contractors. Inland, Jackson’s proximity to UMMC (the state’s only Level I trauma center) and state government buildings drives a significant commercial HVAC services market. Tupelo’s Toyota Motor Manufacturing Mississippi plant represents one of the largest single-facility industrial HVAC accounts in the state.

Estimated Cost to Start an HVAC Business in Mississippi

Cost Item	Estimated Range
MSBOC application and license fees	Contact MSBOC at 800-880-6161 for current fee schedule
PSI exam fees (two exams)	Approximately $100-$200 total (contact PSI for current pricing)
General liability insurance (residential $500K)	$1,500-$4,000/year depending on revenue and claims history
General liability insurance (commercial $1M)	$2,500-$6,000/year depending on revenue and project types
Surety bond ($10,000 residential)	$100-$300/year
EPA 608 certification exam	$20-$60 depending on testing organization
Mississippi LLC formation	$53 (online at business.sos.ms.gov)
Local Business Privilege License	Varies by city/county – contact local clerk
Registered agent service	$49-$150/year
Tools, service vehicle, initial refrigerant stock	$15,000-$60,000+ depending on scope

Frequently Asked Questions: Starting an HVAC Business in Mississippi

Do I need an MSBOC license to do HVAC work in Mississippi?

Yes, if your HVAC project meets or exceeds certain dollar thresholds. For residential remodeling work, you need an MSBOC license when the project value is $10,000 or more. For commercial projects and new residential construction, the threshold is $50,000 or more. Work below these thresholds does not require an MSBOC license, though local permits may still apply. Contact MSBOC at 800-880-6161 to confirm the specific license classification required for your work.

What exams do I need to pass for an MSBOC HVAC license?

MSBOC requires two separate PSI exams: (1) the Law and Business Management exam and (2) the HVAC trade exam covering the Mechanical Contractor or Air Conditioning and Refrigeration Contractor classification. Both are open-book exams with a minimum passing score of 70%. You must pass both before MSBOC will issue your license. Schedule through PSI Exams Online.

How much insurance does an HVAC contractor need in Mississippi?

MSBOC requires $500,000 per occurrence in general liability insurance for residential HVAC contractor classifications, and $1,000,000 per occurrence for commercial classifications. Residential classifications also require a $10,000 surety bond. MSBOC must be named as the certificate holder on your insurance certificate. Contact MSBOC at 601-354-6161 to confirm current requirements.

Is EPA 608 certification required for HVAC technicians in Mississippi?

Yes. EPA 608 certification is a federal requirement under Section 608 of the Clean Air Act that applies in all states including Mississippi. Any technician who purchases, handles, or recovers regulated refrigerants must be EPA 608 certified through an EPA-approved testing organization. This applies to the newer A2L refrigerants (R-32 and R-454B) now entering the market under the AIM Act transition.

What is the A2L refrigerant transition and how does it affect Mississippi HVAC contractors?

Under the federal AIM Act, R-410A is being replaced by lower-GWP A2L refrigerants including R-32 and R-454B. Equipment manufacturers transitioned to A2L-compatible systems with installation phase deadlines in January 2025 and January 2026 depending on equipment type. Mississippi HVAC contractors need updated technician training for A2L handling, new detection equipment, and A2L-compatible recovery tools. The Gulf Coast’s large post-Katrina replacement cycle means significant A2L equipment will be installed in the Harrison, Hancock, and Jackson County markets in the coming years.

When do Mississippi HVAC businesses need workers compensation insurance?

Mississippi requires workers compensation coverage when your business reaches 5 or more employees. Below that threshold, coverage is not required by Mississippi law. Once you reach 5 employees, obtain coverage through the private market using NCCI class code 5183 for HVAC work. The Mississippi Workers Compensation Commission is at mwcc.ms.gov.

Is HVAC labor taxable in Mississippi?

HVAC labor performed as part of a real property improvement is generally not subject to Mississippi’s 7% sales tax. Parts and equipment – condensing units, air handlers, ductwork, refrigerant, thermostats – are taxable at 7%. The tax treatment can depend on how the contract is structured (lump sum vs. time-and-materials). Consult the Mississippi Department of Revenue at tap.dor.ms.gov or a Mississippi tax professional for your specific situation.

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