How to Start an HVAC Business in Indiana (2026)

Last updated: August 25, 2026

Indiana has no statewide HVAC contractor license. Authority is delegated entirely to cities and counties, and every major metro runs its own program with its own fees, bond amounts, insurance minimums, and exam requirements. If you do residential or light commercial HVAC in Indianapolis you need an HVAC Contractor license from the Indianapolis Department of Business and Neighborhood Services (BNS) under Revised Code of the Consolidated City and County, Chapter 875. If you cross into Allen County (Fort Wayne) you register through the Allen County Building Department on top of that. Evansville, South Bend, Bloomington, Lafayette, Muncie, and Richmond each operate their own. Plan the licensing stack city-by-city before quoting your first job – a Carmel-to-Bloomington service van might pull permits in Marion, Hamilton, and Monroe counties on the same week.

The other piece that catches Indiana newcomers: any HVAC work that touches gas piping, hydronic heating, boiler installation, or potable-water connections falls under the Indiana Plumbing Commission (IPLA, IC 25-28.5 / 860 IAC). Plumbing Contractor licensure is a separate state credential with its own bond, exam, and biennial renewal cycle that expires every odd-numbered year. A residential AC-and-furnace shop usually does not need it, but the moment you pick up a hydronic boiler retrofit or a snowmelt system you do. Get clear about scope before you bid hydronic work in Indiana.

HVAC Requirements in Indiana at a Glance

Requirement	Agency	Cost	Timeline
Indiana LLC Articles of Organization	Indiana Secretary of State (INBiz)	$95 online / $100 paper	1-2 business days online
Business Entity Report (biennial)	Indiana Secretary of State (INBiz)	$32 online / $50 paper, every 2 years	Due in anniversary month; 90-day early window per HB 1593 eff Jan 1, 2026
Indianapolis BNS HVAC Contractor License	Indianapolis Dept. of Business and Neighborhood Services	~$200 application + ~$220 exam + ~$200 initial license; $200 annual renewal	2 years qualifying HVAC experience; ICC Business & Law + Mechanical exams at 70%
Indianapolis Surety Bond + Liability Insurance	Surety/insurer (filed with BNS)	$5,000 surety bond + $300,000 general liability minimum	Filed before BNS issues license
Allen County (Fort Wayne) Contractor Registration	Allen County Building Department	~4 years / 7,000 hours qualifying experience; Prov Exams Journeyman + Master ($25/exam)	Required to pull mechanical permits in Allen County
Indiana Plumbing Contractor License (only if doing hydronic / gas piping / boiler work)	Indiana Professional Licensing Agency – Plumbing Commission	$25 application + $50 exam + $50/$100 initial fee + $100 biennial renewal	Biennial; expires Dec 31 of every odd-numbered year
EPA Section 608 Certification (refrigerant)	EPA-approved testing organization	$20-$80 per technician; lifetime certification	Required before purchasing or handling refrigerant
Indiana Workers’ Compensation	Indiana Workers’ Compensation Board + private insurer (competitive market; ICRB rates)	HVAC NCCI 5537 – rate × payroll ÷ $100; required at 1+ employee per IC 22-3-2-2	Before first technician starts; non-coverage = Class A infraction up to $10K fine
Indiana Sales Tax Registration (RRMC)	Indiana Department of Revenue	$25 one-time Registered Retail Merchant Certificate (renewed every 2 years at no charge)	Required before retail parts sales or taxable repair work
Commercial Auto Insurance	Commercial insurer	$1,500-$3,500/year per service vehicle	Required for service trucks
Indiana 811 (Holey Moley) excavation notice	Indiana Underground Plant Protection Service	Free	2 full working days advance notice required for any excavation per IC 8-1-26-16

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

Step 1: Map Your Service Area to City/County License Programs

Indiana is an outlier in the Midwest: there is no state HVAC contractor license. The state does not issue, examine, or renew an HVAC credential of any kind. Authority is delegated entirely to local jurisdictions, and the rules differ city by city.

The practical implication for a new contractor: before you accept your first job, list every city and county in your intended service area, then check whether each one runs its own HVAC license. The list of metros that operate active programs includes Indianapolis (Marion County, through BNS), Fort Wayne (Allen County Building Department), Evansville (with an Ivy Tech exam component), South Bend (St. Joseph County), Bloomington (Monroe County), Lafayette / West Lafayette (Tippecanoe County), Muncie (Delaware County), and Richmond (Wayne County). The Hamilton County suburbs north of Indianapolis – Carmel, Fishers, Noblesville, Westfield – and the rapidly growing Hendricks County (Avon, Plainfield, Brownsburg) typically follow the Indianapolis BNS practice but verify with each city.

Reciprocity between Indiana cities is essentially nonexistent. Holding the Indianapolis BNS license does not waive Allen County’s exam, and vice versa. A contractor working both sides of US-31 between Indianapolis and Lafayette will hold credentials in two or three jurisdictions.

Step 2: Form Your Indiana LLC

File Articles of Organization at the INBiz portal run by the Indiana Secretary of State. Filing fee: $95 online or $100 by mail. Standard processing 1-2 business days for online filings.

Indiana LLCs file a Business Entity Report every two years, not annually – $32 online or $50 by mail – due in the anniversary month of formation. Effective January 1, 2026, HB 1593 opened a 90-day early filing window before the report’s due month. Missing the deadline triggers late fees and eventual administrative dissolution.

Get your free federal EIN at IRS.gov immediately after the LLC is approved. You will need it for every city HVAC license, the Registered Retail Merchant Certificate, and your workers’ comp policy.

Step 3: Indianapolis BNS HVAC Contractor License (Marion County)

The Indianapolis Department of Business and Neighborhood Services administers contractor licensing under Revised Code of the Consolidated City and County, Chapter 875. The HVAC track requirements:

Indianapolis BNS HVAC Contractor	Detail
Experience minimum	2 years of documented qualifying mechanical experience for the qualifying individual (verified by employer letters)
Application fee	~$200
Exam fees	~$220 total – ICC Business & Law (50 questions, 120 minutes, 70% pass) + ICC Mechanical Trade (80 questions, 240 minutes, 70% pass)
Initial license fee	~$200
Surety bond	$5,000 contractor license bond, form prescribed by BNS
General liability minimum	$300,000
Workers’ comp	Certificate required if you have any employees
Annual renewal	~$200
Approximate first-year total	~$600 in fees plus bond + insurance premiums

BNS is located at 1200 Madison Avenue, Suite 100, Indianapolis, IN 46225. The license entitles you to pull mechanical permits anywhere in the consolidated city-county of Indianapolis-Marion County, including the included excluded cities (Beech Grove, Lawrence, Southport, Speedway).

Practical note: BNS will not issue the license until your bond is filed, your insurance certificate names BNS as certificate holder, and (if you have employees) your workers’ comp certificate is on file. Build the document stack before scheduling your ICC exams.

Step 4: Other County and City Licenses

Each metro outside Indianapolis runs its own program. Common patterns:

Fort Wayne (Allen County Building Department)

• Experience: 4 years and 7,000 hours of qualifying HVAC experience; up to 1,000 hours can come from approved formal education
• Exams: Prov Exams Journeyman and Master levels, $25 per exam attempt
• Authority: Allen County Building Department, not the City of Fort Wayne directly
• Scope: Required to pull mechanical permits anywhere in Allen County

Evansville (Vanderburgh County)

• Application fee: $25 (apprentice) up to $300 (contractor) by license tier
• Exam: Administered through Ivy Tech Community College; ~$175 exam fee
• Scope: City of Evansville and Vanderburgh County

Other Indiana Cities

• Richmond (Wayne County): 75% exam pass score required, $50 annual fee
• Muncie (Delaware County): City contractor license + surety bond required
• South Bend / Mishawaka (St. Joseph County): Local mechanical contractor registration
• Bloomington (Monroe County): Local contractor registration; verify with City of Bloomington
• Lafayette / West Lafayette (Tippecanoe County): City contractor license
• Hamilton County suburbs (Carmel, Fishers, Noblesville, Westfield): Generally follow Indianapolis BNS practice; check each city directly

The variation in fees, exams, and bond requirements across Indiana cities is one of the primary administrative headaches of HVAC contracting in this state. There is no central registry; you have to call each building department or check each city’s contractor licensing page.

Step 5: Indiana Plumbing Commission – Only If You Touch Hydronic, Gas Piping, or Boiler Work

The Indiana Plumbing Commission under the Indiana Professional Licensing Agency (IPLA) – authority IC 25-28.5 and 860 IAC – licenses Plumbing Contractors for any work involving potable water, gas piping, or hydronic systems. This is the credential that catches HVAC contractors off guard.

Standard split-system air conditioning and forced-air furnace work does NOT require Plumbing Contractor licensure. But the moment your work touches:

• Gas piping for furnaces, boilers, pool heaters, fireplaces, or generators
• Hydronic heating loops (radiant floor, baseboard, snowmelt)
• Boiler installation, replacement, or condensate drainage tied to plumbing systems
• Combination boiler / domestic hot water systems
• Direct potable-water connections (humidifier supply, drain pan condensate to plumbing)

…you fall under the Plumbing Commission’s jurisdiction. License fees:

Plumbing Contractor License (IC 25-28.5)	Fee
Application fee	$25 (credit/debit card)
Examination fee	$50 per attempt
Initial license fee (odd-numbered year issuance)	$50
Initial license fee (even-numbered year issuance)	$100
Biennial renewal fee	$100
Renewal expiration	December 31 of every odd-numbered year
Late renewal penalty (after Dec 31, before Mar 1)	+$15
Late renewal penalty (after Mar 1)	+$200

Practical implication: many Indiana hydronic and boiler shops carry a Plumbing Contractor license alongside their city HVAC credentials. If your business model is forced-air-only residential, you can typically skip the Plumbing Commission. If you market boiler service or radiant floor installations, get the credential before you bid the work.

Step 6: EPA Section 608 Certification

Federal EPA Section 608 certification is mandatory for any HVAC technician who purchases, handles, or recovers refrigerant. This is a federal requirement; Indiana does not add a state overlay.

• Type I: Small appliances (less than 5 lbs of refrigerant) – residential refrigerators, window AC units
• Type II: High-pressure systems – most central AC, heat pumps, residential and light commercial refrigeration
• Type III: Low-pressure systems – chillers and large industrial refrigeration
• Universal: All types
• Cost: $20-$80 per certification through approved testing organizations
• Validity: Lifetime; no renewal
• Penalties: Up to $46,989 per violation per day under federal Clean Air Act enforcement (amount adjusted annually)

Step 7: A2L Refrigerant Transition (Effective January 1, 2025)

The federal AIM Act phaseout of high-GWP refrigerants moved new residential and light commercial AC equipment to A2L (mildly flammable) refrigerants effective January 1, 2025. The two replacement refrigerants now common in Indiana installations:

• R-32 (single-component): Daikin’s primary residential refrigerant – simpler charging, vapor-state introduction acceptable
• R-454B (zeotropic blend): Used by Carrier, Trane, Lennox, Rheem, and most other major manufacturers – requires liquid-state charging because the blend will fractionate if vapor-charged, changing performance

What changed for your shop in 2025-2026:

• Recovery equipment: A2L-rated recovery machines required – many older recovery units are not A2L-compatible
• Leak detection: A2L-rated leak detectors
• Service tools: Manifold gauge sets rated for A2L; spark-free service tools recommended in confined spaces
• OEM training: Each manufacturer (Carrier, Trane, Daikin, Lennox, Rheem) has equipment-specific A2L training – typically required for warranty coverage on new installations
• Code compliance: Indiana’s residential code (IRC-based, adopted 2018 IECC effective December 26, 2019) and commercial energy code (ASHRAE 90.1-2007 with amendments) predate A2L provisions. Most A2L compliance comes from the equipment manufacturer’s installation instructions and the federal AIM Act, not from updated state code language

Step 8: Indiana Workers’ Compensation

Indiana operates a competitive workers’ compensation market – any admitted carrier (Travelers, The Hartford, Liberty Mutual, EMC, Pinnacol, etc.) can write your policy. Coverage is administered by the Indiana Workers’ Compensation Board, with the Indiana Compensation Rating Bureau (ICRB) handling classification and rating.

• Mandatory threshold: 1+ employee under IC 22-3-2-2; full-time, part-time, and seasonal workers all count
• NCCI class code: 5537 (Heating, Ventilating and Air Conditioning Installation, Service & Repair) – higher-rated class given falls, lifts, electrical exposure, refrigerant handling
• Premium calculation: Manual class code rate × payroll ÷ $100, adjusted by experience modifier
• Independent contractor exemption: Available, but Indiana applies an IRS-style multi-factor test – misclassifying employees as 1099 contractors is a common ICRB audit finding for HVAC shops
• Penalty for non-coverage: Class A infraction under IC 22-3-5-1 – fines up to $10,000, double statutory compensation, medical expenses, attorney fees, and potential business closure order until proof of insurance
• Injury reporting: All injuries must be reported to your insurer; injuries causing 1+ days missed work must be reported to the Workers’ Compensation Board (Class C infraction for failure)

Step 9: Indiana Sales Tax + Indiana 811

Indiana sales tax is a flat 7% statewide with no local sales tax additions – one of only four states tied for the second-highest state-level rate. The flat structure simplifies bookkeeping compared to neighboring Ohio (6.50%-8.00% combined) or Illinois (variable local rates).

Get a Registered Retail Merchant Certificate (RRMC) from the Indiana Department of Revenue before selling parts retail or doing taxable repair work. The certificate costs $25 one-time and renews free every two years. The Indiana Department of Revenue treats most HVAC work as construction contractor activity:

• Real property installation (most central AC, furnace, ductwork, heat pump installs): contractor pays sales tax on materials at purchase from supply houses; does NOT charge customer sales tax on labor or materials in the installation invoice
• Tangible personal property repair (window AC, portable units, parts counter sales): contractor charges customer 7% sales tax on the full invoice and can buy parts tax-free for resale using the RRMC

Indiana 811 (Holey Moley): Call indiana811.org or 811 at least two full working days (not counting the call day, weekends, or holidays) before any excavation – condenser pad pours, line-set trenching, geothermal loop installation, or fuel oil tank work all qualify. Authority is IC 8-1-26-16; the Indiana Utility Regulatory Commission enforces with civil penalties for damage to underground facilities. Notice is valid for up to 10 calendar days.

Indiana HVAC Market: Where the Demand Is

Indianapolis-Carmel-Anderson MSA (Marion + Hamilton + Hendricks + Boone + Hancock + Madison + Johnson): The largest single market in the state and the fastest-growing suburban ring. Eli Lilly’s $9 billion LEAP campus expansion in Lebanon (Boone County), the Indianapolis International Airport’s ongoing terminal modernization, and sustained residential growth across Hamilton County (Carmel, Fishers, Westfield, Noblesville among the fastest-growing US suburbs) are driving both new-construction HVAC and a heavy residential service-and-replacement market. The Indiana Convention Center and Lucas Oil Stadium hosted the NCAA men’s basketball tournament’s centralized 2021 bubble and remain rotation hosts for major events – commercial HVAC for hospitality and event facilities is a steady book.

Northwest Indiana (Lake + Porter): Gary, Hammond, Whiting, and Munster are on Central Time and operate effectively as the Chicago metro’s southern edge. Many NW Indiana HVAC contractors hold dual licenses in Illinois (often Cook County or Chicago city plumbing/HVAC contractor licenses) to serve clients across the state line. Steel mills (Cleveland-Cliffs, U.S. Steel Gary Works), petroleum (BP Whiting refinery), and the residential market behind those plants drive a large industrial and commercial HVAC pipeline. The time zone split with the rest of Indiana is a real scheduling consideration: dispatch from Indianapolis to Gary loses an hour, and emergency call windows shift.

Fort Wayne (Allen County): Indiana’s second-largest metro with a heavy manufacturing base (BAE Systems, GM Fort Wayne Assembly, Sweetwater Sound, Steel Dynamics). Allen County’s 4-year/7,000-hour HVAC experience requirement is one of the higher bars in the state, which keeps the contractor count smaller and the per-job pricing firmer than in some other markets.

Bloomington and West Lafayette (university towns): Indiana University and Purdue drive a stable rental-housing service market plus institutional HVAC for campus expansion. Both Monroe County (IU Health Bloomington Hospital) and Tippecanoe County (Subaru of Indiana Automotive in Lafayette) layer steady commercial work on top of the residential base.

Southern Indiana (Evansville, Jeffersonville, New Albany): Evansville anchors the SW corner with Toyota Indiana (Princeton), Berry Global, and the Ohio River industrial corridor. The Louisville Metro spillover into Clark and Floyd counties (Jeffersonville, New Albany, Clarksville) produces an HVAC market structurally tied to Kentucky pricing – expect competitive pressure from Louisville-based contractors crossing the bridge.

Heating-driven service revenue: Indiana’s average winter low temperatures put it in a higher heating-demand band than Tennessee or Kentucky. Furnace replacement, gas pack diagnostics, and emergency heating service are major revenue items November-March, with maintenance contracts smoothing the offseason. Cold-climate heat pump adoption (Mitsubishi Hyper-Heat, Daikin Aurora, Carrier Greenspeed – rated to perform at -13°F) is accelerating in northern and central Indiana, often bid as dual-fuel installations with auxiliary gas heat.

Eli Lilly biopharma cleanrooms: Indianapolis is the global headquarters for Eli Lilly. The LEAP campus, Indianapolis Technology Center expansion, and contract-manufacturing growth produce specialty cleanroom and pharmaceutical-grade HVAC work (HEPA filtration, redundant systems, validated environmental controls) – a niche that requires manufacturer training and pharma-quality documentation but commands premium margins.

Cost to Start an HVAC Business in Indiana

Residential-Only Solo Contractor (Indianapolis Service Area)

Item	Cost	Notes
Indiana LLC	$95	One-time online; $32 biennial Business Entity Report
Federal EIN	Free	IRS online
Indianapolis BNS HVAC Contractor License (first year)	~$600	Application + ICC exams + initial license
$5,000 surety bond (Indianapolis)	$100-$250/year	Bond premium typically 1-3% of bond amount
$300,000 general liability (Indianapolis minimum)	$1,200-$2,400/year	Higher in dense urban markets; expect $500K-$1M for commercial work
Commercial auto insurance (1 service truck)	$1,500-$3,500/year	Required for any work vehicle
Workers’ comp (if hiring)	NCCI 5537 rate × payroll	One of the higher-rated trade classes
EPA 608 Universal certification	$50-$80	Lifetime
Registered Retail Merchant Certificate (RRMC)	$25	One-time, free biennial renewal
Tools and gauges (A2L-rated set)	$3,000-$8,000	Manifold, recovery, vacuum, leak detection
Refrigerant inventory (initial)	$1,500-$3,000	R-410A for legacy + R-32/R-454B for new equipment
Branding, web, scheduling software	$500-$2,500	ServiceTitan, Housecall Pro, Jobber
Estimated total: $10,000-$25,000 to start residential service in Indianapolis

Multi-County Contractor with Hydronic / Boiler Capability

Stacking Indianapolis BNS + Allen County + Plumbing Commission + heavier liability ($500K-$1M) for commercial bid eligibility, brazing-equipped service trucks, larger refrigerant inventory, and additional county/city registrations runs $25,000-$75,000+. Adding a Plumbing Commission license is the threshold that opens the boiler, hydronic, and snowmelt market – typically $50K-$200K in annual incremental revenue per technician for shops that bid both forced-air and hydronic.

Key Indiana Agencies for HVAC Contractors

Agency	What They Handle	Contact
Indianapolis Department of Business and Neighborhood Services (BNS)	Indianapolis-Marion County HVAC Contractor licensing under Revised Code Chapter 875	indy.gov/BNS / 1200 Madison Ave Ste 100, Indianapolis, IN 46225
Allen County Building Department	Fort Wayne / Allen County HVAC contractor registration (4 yrs / 7,000 hrs experience)	allencounty.in.gov
Indiana Professional Licensing Agency (IPLA) – Plumbing Commission	Plumbing Contractor licensure for hydronic, gas piping, and boiler work (IC 25-28.5 / 860 IAC)	in.gov/pla
Indiana Workers’ Compensation Board (WCB)	Workers’ comp claims, dispute resolution, employer compliance	in.gov/wcb
Indiana Compensation Rating Bureau (ICRB)	Workers’ comp classification (NCCI 5537 for HVAC) and rating	icrb.net
Indiana Department of Revenue (DOR)	Sales tax (7% flat statewide, no local), Registered Retail Merchant Certificate, county LIT collection	in.gov/dor
Indiana Secretary of State (INBiz)	LLC formation ($95/$100), biennial Business Entity Report ($32/$50)	inbiz.in.gov
Indiana 811 (Holey Moley / IUPPS)	Excavation notification – 2 working days advance notice required (IC 8-1-26-16)	indiana811.org / 811 / 1433 Holey Moley Way, Greenwood, IN 46143
EPA Section 608 Program	Federal refrigerant handler certification	epa.gov/section608

Related Indiana Business Guides

• Starting a Business in Indiana: Complete Guide

← Back to all Indiana business guides

Frequently Asked Questions

Do I need a state HVAC license in Indiana?

No. Indiana has no statewide HVAC contractor license – the state delegates HVAC licensing entirely to cities and counties. Indianapolis (BNS), Fort Wayne (Allen County), Evansville, South Bend, Bloomington, Lafayette, Muncie, and Richmond each run their own programs with their own fees, bonds, exams, and experience requirements. Hamilton County suburbs (Carmel, Fishers, Noblesville, Westfield) generally follow Indianapolis BNS practice. Confirm requirements with each city or county building department before quoting work in their jurisdiction.

What does the Indiana Plumbing Commission license cover for HVAC contractors?

The Plumbing Commission under IPLA (IC 25-28.5 / 860 IAC) licenses Plumbing Contractors for any work involving potable water, gas piping, or hydronic systems. Standard split-system AC and forced-air furnace work does NOT require it. Hydronic boilers, radiant floor heating, snowmelt systems, gas-piping installation for furnaces or pool heaters, and combination boiler / domestic-water systems DO. Plumbing Contractor license fees: $25 application + $50 exam + $50/$100 initial fee (depending on year) + $100 biennial renewal. Licenses expire December 31 of every odd-numbered year.

How does the Indianapolis BNS HVAC Contractor License work?

The Indianapolis Department of Business and Neighborhood Services issues HVAC Contractor licenses under Revised Code of the Consolidated City and County, Chapter 875. Requirements: 2 years of qualifying mechanical experience minimum; pass two ICC exams (Business & Law and Mechanical Trade) at 70% or better; post a $5,000 surety bond; carry $300,000 general liability minimum; provide workers’ comp certificate if you have employees. First-year fees run roughly $600 (application + ICC exam fees + initial license), with $200 annual renewals. The license covers all of Marion County and the consolidated city of Indianapolis.

Does Indiana require workers’ comp for HVAC contractors?

Yes – any HVAC contractor with one or more employees must carry workers’ comp under IC 22-3-2-2. Indiana operates a competitive market (any admitted carrier writes coverage), with the Indiana Compensation Rating Bureau handling classification and rating. HVAC is NCCI class code 5537 – a higher-rated trade class. Non-coverage is a Class A infraction under IC 22-3-5-1: fines up to $10,000, double statutory compensation, medical expenses, attorney fees, and potential business closure order until proof of insurance is provided.

How does Indiana sales tax apply to HVAC work?

Indiana imposes a flat 7% sales tax statewide with no local sales tax additions – simpler than Ohio (6.50%-8.00% combined) or Illinois. For real property HVAC installation (central AC, furnace, ductwork, heat pump installs), the contractor pays Indiana sales tax on materials at purchase from supply houses but does NOT charge the customer sales tax on labor or materials in the installation invoice. For tangible personal property repair (window AC, portable units, parts counter sales), the contractor charges customer 7% sales tax on the full invoice and can buy parts tax-free for resale using the Registered Retail Merchant Certificate ($25 one-time, free biennial renewal).

What changed with refrigerants in Indiana in 2025-2026?

The federal AIM Act phased new residential and light commercial AC equipment to A2L (mildly flammable) refrigerants effective January 1, 2025. R-32 (Daikin’s primary residential refrigerant) and R-454B (Carrier, Trane, Lennox, Rheem) replaced R-410A in new equipment. R-454B is a zeotropic blend that requires liquid-state charging – vapor charging fractionates the blend and changes performance. Plan for A2L-rated recovery machines, leak detectors, and gauges; OEM training for warranty coverage; and operating procedures that account for the mild flammability rating in confined-space work.

How much does it cost to start an HVAC business in Indiana?

A residential-only solo contractor working Indianapolis can start for $10,000-$25,000: Indiana LLC ($95), federal EIN (free), Indianapolis BNS HVAC Contractor license (~$600 first year), $5,000 surety bond ($100-$250/year premium), $300,000 general liability ($1,200-$2,400/year), commercial auto ($1,500-$3,500/year), EPA 608 ($50-$80), RRMC ($25), A2L-compatible tools and gauges ($3,000-$8,000), and initial refrigerant inventory ($1,500-$3,000). A multi-county contractor with hydronic / boiler capability adds Plumbing Commission licensure plus additional county/city registrations and runs $25,000-$75,000+.

Comparing states? See our HVAC business guides for all 50 states.