How to Start an HVAC Business in Michigan (2026)

Last updated: April 24, 2026

Michigan requires a state-issued Mechanical Contractor License to install, service, or alter HVAC systems for compensation – this is the single biggest gate between you and legal operation. The license is issued by LARA’s Bureau of Construction Codes (BCC) under the Forbes Mechanical Contractor Act (1984 PA 192). To qualify, you need at least 3 years or 6,000 verifiable hours of experience working under a Michigan-licensed Mechanical Contractor in each classification you want to be licensed in, plus passage of PSI-administered exams for each classification, a high school diploma or GED, and proof you’re 18 or older. The application fee is $300; most classification exams cost $50 each, though the HVAC Equipment classification exam is $100.

Michigan’s HVAC market is shaped by three structural factors. First, the climate: 5,000-7,500 heating degree days per year across most of Lower Michigan and 7,000-9,500+ in the UP creates year-round heating service revenue with summer AC replacement peaks. Second, the freeze-thaw cycle stresses residential duct systems, boilers, and heat pumps in ways southern-market technicians never see – Michigan customers specifically value operators who understand Michigan buildings. Third, the federal A2L refrigerant transition (R-32 and R-454B replacing R-410A in new equipment starting January 2025) is in full swing, and Michigan technicians need updated tooling and training to service both refrigerant classes in parallel. This guide walks through the Michigan-specific licensing process, permit pathways, and market context for starting an HVAC business here.

HVAC Business Requirements in Michigan at a Glance

Requirement	Agency / Detail	Cost	Timeline
LLC Articles of Organization	LARA Corporations Division	$50	~1 hour online
LLC Annual Statement	LARA	$25/year; $50 late Feb 16	Due Feb 15 annually
Federal EIN	IRS.gov	Free	Immediate
Mechanical Contractor License Application	LARA BCC	$300 application	After exam passage
PSI Classification Exams (per classification)	PSI Services	$100 HVAC Equipment; $50 others	Schedule after experience verification
Experience verification (3 yrs / 6,000 hrs)	Signed affidavit from licensed Mechanical Contractor	–	Before exam eligibility
Federal EPA 608 Technician Certification (per tech handling refrigerant)	EPA-approved testing org	~$20-$50 per type exam	Before handling refrigerant
Michigan Sales Tax License	MTO	Free	Before sale of equipment
Withholding / UIA / ESTA compliance	Treasury + UIA + LEO Wage & Hour	Free registration; payroll cost	Before first employee payroll
Workers’ Compensation Insurance	Private insurer, Accident Fund, or Placement Facility	Construction rates typically 4%-8% of wages for HVAC	At 1 EE x 35 hrs x 13 wks OR 3+ EE at once
General Liability Insurance	Commercial insurer	$750-$2,500/year small contractor	Before pulling first permit
Commercial Auto Insurance	Commercial insurer	$1,500-$4,000/year per service truck	Before running service routes
Mechanical Permits (per job)	Local building department OR LARA BCC	Typically $75-$500 per installation	Before installation starts
Detroit BSEED Contractor License (Detroit work)	Detroit BSEED	~$150-$400	Before Detroit work

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

Step 1: Satisfy the LARA Experience Requirement

Michigan requires 3 years / 6,000 verifiable hours of work experience under a Michigan-licensed Mechanical Contractor in each classification you plan to be licensed in. Experience is documented by signed affidavits from the Michigan-licensed contractor you worked for – LARA expects specific hours by classification, not general “HVAC work.” If you worked in Ohio or another state without Michigan-recognized licensure, that experience generally does not count toward Michigan’s 6,000-hour requirement.

Classifications recognized under the Mechanical Contractor License:

• HVAC Equipment – core heating, ventilation, and air conditioning equipment ($100 exam)
• Hydronic Heating and Cooling – boilers, chilled water systems, radiant ($50)
• Limited Heating and Air Conditioning – restricted to smaller residential systems ($50)
• Refrigeration – commercial refrigeration, ice machines, walk-ins ($50)
• Ductwork – fabrication and installation ($50)
• Fuel Gas Piping – natural gas and LP distribution ($50)
• Unlimited Heating Service – service and repair without installation limit ($50)
• Specialty Limited Heating – hearth products, vented fireplaces ($50)

Pick the classifications you actually work in – each classification requires its own exam, its own documented experience, and shows on your license. Residential HVAC generally needs HVAC Equipment + Fuel Gas Piping + Ductwork at minimum; commercial work often adds Refrigeration and Hydronic Heating.

Step 2: Pass PSI-Administered Exams

Michigan Mechanical Contractor exams are delivered by PSI Services at testing centers around the state. Exams cover the Michigan Mechanical Code (Michigan’s adoption of the International Mechanical Code with Michigan amendments), the Michigan Building Code, business/law content relevant to mechanical contracting, and classification-specific technical content.

Schedule exams through PSI after LARA has verified your experience. Pass rates vary by classification – HVAC Equipment and Refrigeration are the most challenging; Ductwork and Specialty Limited Heating tend to be more straightforward.

Step 3: Apply to LARA BCC

After passing exams, submit the Application for Mechanical Contractor Examination & Licensing (Form BCC-11) to LARA’s Bureau of Construction Codes with:

• Completed application
• $300 application fee (cashier’s check, money order, or online payment)
• Exam pass verification from PSI
• Experience affidavits from your supervising licensed contractor(s)
• Proof of business entity (LLC Articles of Organization, corporation filing, or sole proprietor documentation)
• Financial documentation showing the business can meet its obligations

Email completed applications to larabcc-licensing@michigan.gov or mail/deliver to LARA BCC at PO Box 30254, Lansing, MI 48909. License processing typically takes 4-12 weeks from complete application submission.

Step 4: Federal EPA 608 Technician Certification

Every technician who opens refrigerant lines in Michigan must hold federal EPA Section 608 certification:

• Type I: Small appliances (5 lbs or less charge)
• Type II: High-pressure systems (most residential AC, heat pumps)
• Type III: Low-pressure systems (centrifugal chillers)
• Universal: All three types

Cost: roughly $20-$50 per type exam through approved testing organizations. The federal 608 is separate from Michigan’s Mechanical Contractor License – you need both. The business license lets the company do mechanical work; the 608 lets the technician handle refrigerant.

Step 5: A2L Refrigerant Transition (2025-2026)

Federal rules require HVAC equipment manufactured on or after January 1, 2025 to use low-GWP refrigerants – primarily R-32 and R-454B (both are A2L refrigerants, classified as “mildly flammable”). This changes field work in three practical ways:

• Tooling: Recovery machines, leak detectors, and gauges rated for A2L service are required. Some pre-2024 equipment is not rated.
• Training: Most major OEMs (Carrier, Trane, Lennox, Rheem, Daikin, Mitsubishi) require updated technician training for warranty support on A2L equipment.
• Parallel inventory: For the next several years, existing R-410A equipment in the field will still need service alongside new R-32/R-454B installs. Keep both classes of recovery machines and cylinders.

Step 6: Register for Taxes and Payroll

• Sales tax license – free at Michigan Treasury Online. HVAC labor is generally not taxable when it becomes a structural part of real property (the “real property improvement” rule), but HVAC contractors are still treated as the end consumer on equipment – you pay sales tax to your supplier at 6% on equipment purchased for installation. Sale of portable equipment (window AC units sold to customer, not installed) is a taxable retail sale.
• Withholding tax registration. State 4.25%. Add city withholding for employees in Detroit, GR, Lansing, etc.
• UIA account through MiWAM. HVAC is considered construction for UIA rate purposes, which places the new-employer rate at the construction industry average rather than the 2.7% non-construction new-employer rate.
• New Hire reporting within 20 days at mi-newhire.com.
• ESTA compliance: Accrual or frontload for every employee.
• Workers’ comp: Triggers at 1 EE x 35 hrs x 13 wks OR 3+ EE at once. Construction class codes for HVAC (NCCI 5183, 5190, 5537 depending on work mix) run 4%-8% of wages – considerably higher than the janitorial or retail classes most other small businesses sit in.

Step 7: Mechanical Permits for Every Job

The Michigan Mechanical Code requires a permit for every HVAC installation, replacement (in many cases), alteration, or major repair. Permit authority is split:

• Municipal jurisdictions with their own inspection programs: Detroit, Grand Rapids, Ann Arbor, Lansing, Warren, Sterling Heights, Troy, Livonia, Dearborn, Kalamazoo, and many others run their own building/mechanical permit desks. Pull permits through the city building department.
• State-inspection jurisdictions: For areas without a local inspection program, permits are pulled through LARA BCC and state inspectors perform the inspection.

Permit cost varies by jurisdiction and scope – typical residential furnace or AC replacement permit: $75-$250. Commercial work: $200-$2,000+. Always pull the permit before installation starts. Unpermitted work is a frequent source of MCR (Mechanical Contractor Review) complaints and can cost you your license.

Step 8: Detroit and City-Level Contractor Licensing

• Detroit: HVAC contractors working in Detroit also need to register with BSEED as a licensed contractor. Detroit charges its own permit fees separate from LARA licensing.
• Grand Rapids, Kalamazoo, Lansing: Contractor registration with the city and use of local permits.
• Most suburbs: Require registration as a contractor with the local building department before pulling permits. Typically no separate “license” beyond state LARA credentials, but registration forms and proof of insurance are normal.

The Michigan HVAC Market: Where the Demand Is

• Climate-driven year-round demand: Most of Lower Michigan accumulates 5,000-7,500 heating degree days per year (Grand Rapids ~6,700; Detroit ~6,200; Traverse City ~7,300). The UP runs 8,500-10,000+. Heating system failures between November and March are emergency-grade work with premium pricing.
• Aging housing stock: Metro Detroit has one of the oldest housing stocks in the country (median single-family home built 1950-1970). Furnace and boiler replacements, duct renovations, and conversions from oil to natural gas are ongoing markets.
• AC retrofit in older homes: Many Detroit, Flint, and Grand Rapids homes were built without central AC. As summers get hotter, demand for retrofit AC, mini-split installs, and heat pump upgrades continues to grow.
• Heat pump market expansion: Michigan’s climate historically limited air-source heat pumps, but cold-climate heat pumps from Mitsubishi, Daikin, Bosch, and others rated for Michigan winters are now viable. Michigan Saves, DTE Energy, and Consumers Energy rebates for qualifying installations create demand.
• Commercial and industrial: Metro Detroit auto plants, Tier 1 supplier facilities, Henry Ford/Corewell/DMC hospital systems, and commercial real estate across Oakland and Macomb counties sustain steady commercial HVAC service and retrofit work.
• New residential construction: Michigan new-home construction concentrates in Oakland, Livingston, and Washtenaw counties and in the GR metro (Kent, Ottawa, Allegan). Builders typically contract HVAC installations as rough-in + equipment + startup.
• Up North seasonal homes: Second-home and vacation-rental HVAC in Leelanau, Charlevoix, Emmet counties concentrates spring startup and fall winterization. Absentee-owner inspection contracts are a profitable service product.

Cost to Start an HVAC Business in Michigan

Item	Solo Contractor (already licensed)	Full-Service Shop (2-4 techs)
LLC + Annual Statement + EIN	$75	$75
LARA Mechanical Contractor application	$300	$300
PSI exams (per classification)	$100-$350 total	$100-$350 total
EPA 608 per technician	$50-$100	$150-$400
Michigan sales tax / withholding / UIA registration	$0	$0
Service truck (used) + rack system + tools	$18,000-$35,000	$50,000-$120,000
A2L-rated recovery + leak detection + gauges	$1,500-$3,500	$4,500-$12,000
General liability insurance (annual)	$750-$1,500	$1,800-$3,500
Commercial auto (annual, per truck)	$1,500-$3,000	$4,500-$12,000
Workers’ comp (annual, once staffed)	$0 (solo)	$6,000-$20,000
City/municipal contractor registrations	$200-$800	$500-$2,000
Field service software + dispatch + payments	$900-$2,400/yr	$3,000-$9,000/yr
Marketing / website / truck wrap	$2,000-$6,000	$8,000-$25,000
Working capital / parts inventory	$3,000-$8,000	$15,000-$50,000
Estimated Year 1 startup	$28,375-$68,150	$93,875-$254,625

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Frequently Asked Questions

Do I need a Michigan state license to run an HVAC business?

Yes. Michigan requires a Mechanical Contractor License issued by LARA’s Bureau of Construction Codes to install, service, or alter HVAC systems for compensation. To qualify you need 3 years / 6,000 verifiable hours of experience under a Michigan-licensed Mechanical Contractor in each classification you want, passage of PSI exams for each classification, a HS diploma or GED, and you must be 18 or older. Application fee is $300. The business license lets the company operate; the federal EPA 608 certification is separate and is held by the technician who actually handles refrigerant.

How long does it take to become a licensed HVAC contractor in Michigan?

The 3-year / 6,000-hour experience requirement is the binding constraint. If you’re already building experience under a Michigan-licensed Mechanical Contractor, that clock is running. Once you have the hours, exam prep typically takes 2-6 months depending on how many classifications you pursue, and LARA processing runs 4-12 weeks after submission. Realistic path from zero experience to own-shop licensed operator is 3-4 years.

Which classifications should I get licensed in?

Residential HVAC operators typically need HVAC Equipment ($100 exam) + Fuel Gas Piping ($50) + Ductwork ($50) at minimum. Commercial operators add Refrigeration ($50) and often Hydronic Heating ($50). Specialty niches (hearth, unlimited heating service) are additional. Each classification requires separate documented experience – you can’t pass an exam for a classification you haven’t worked in.

Do HVAC services count as taxable in Michigan?

HVAC installation labor that results in tangible personal property being affixed to and made a structural part of real estate is generally not taxable – the “real property improvement” rule. As a contractor, you are treated as the end consumer for the equipment you install; you pay Michigan 6% sales tax to your supplier on the equipment at wholesale and do not separately charge customers sales tax on the installed system. Retail sales of portable or non-installed equipment (window AC units sold without installation) are taxable retail sales. Service contracts and maintenance agreements for installed systems are generally not taxable. When in doubt, consult Treasury’s Revenue Administrative Bulletins and a CPA who handles contractors.

What refrigerants do I need to support in 2026?

Equipment manufactured from January 1, 2025 onward primarily uses R-32 and R-454B (A2L class, mildly flammable). Equipment made before that date almost all uses R-410A. For the next 5-10 years, you’ll support all three in parallel. Invest in A2L-rated recovery machines, leak detectors, and gauges early. OEM training requirements for A2L warranty service are tightening – stay current with Carrier, Trane, Lennox, Rheem, Daikin, and Mitsubishi factory training.

Does ESTA apply to HVAC technicians?

Yes. ESTA applies to every Michigan employer with employees since October 1, 2025. HVAC technicians, install helpers, and dispatchers all accrue paid sick time at 1 hour per 30 hours worked (cap 72 hours/year for 11+ employer, 40 hours/year for 10 or fewer). Frontloading is often simpler for shops that dispatch daily and prefer not to track accrual. Construction workers’ comp class codes plus ESTA add material labor overhead – factor these into hourly billing rates.

Can an out-of-state HVAC contractor work in Michigan?

Not without a Michigan Mechanical Contractor License. Michigan does not offer reciprocity with Ohio, Indiana, Wisconsin, Illinois, or most other states. Out-of-state contractors must meet the full 6,000-hour experience requirement (Michigan-licensed supervision only), pass the PSI exams, and apply to LARA BCC like any new applicant. Working without a Michigan license exposes you to enforcement action and potential criminal penalties.