How to Start an HVAC Business in Illinois (2026)

Last updated: February 25, 2026

Illinois is one of the states that does not require a statewide HVAC contractor license, which makes the barrier to entry lower than in many other states. However, this doesn’t mean there are no requirements – HVAC licensing is handled at the municipal level, and many Illinois cities (including Chicago) have their own contractor licensing exams, insurance mandates, and bonding requirements.

You’ll also need federal EPA 608 certification to handle refrigerants, and Illinois’s strict workers’ comp rules apply from your very first employee. This guide covers every requirement, cost, and step to legally start and operate an HVAC business in Illinois.

HVAC Business Requirements in Illinois at a Glance

Requirement	Agency	Cost	Timeline
LLC Formation	IL Secretary of State	$150	Several weeks (mail) or 4-5 days (online + $100)
Federal EIN	IRS	Free	Immediate (online)
EPA 608 Certification (Universal)	U.S. EPA	$150-$300	Same day (after passing exam)
Local HVAC Contractor License	Municipal building department	$100-$500+	Varies by municipality
State HVAC License	N/A	Not required (no statewide license)	–
General Liability Insurance	Commercial insurer	$1,500-$4,000/year	Same day
Workers’ Comp (any employees)	Commercial insurer	Varies by payroll	Same day
Local Business License	City/village clerk	Varies	1-2 weeks
Surety Bond (some municipalities)	Bonding company	$100-$500/year	Same day

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

Step 1: Form Your Illinois LLC

File Articles of Organization with the Illinois Secretary of State ($150 by mail, $250 online expedited). Then get your free EIN from the IRS.

Annual Report: $75/year, due on the first day of your LLC’s anniversary month.

Step 2: Get EPA 608 Certification

Federal law requires EPA Section 608 certification for anyone who services, maintains, repairs, or disposes of equipment containing refrigerants. This applies regardless of whether Illinois has a state HVAC license.

Certification Type	What It Covers
Type I	Small appliances (5 lbs or less refrigerant)
Type II	High-pressure systems (most A/C and heat pumps)
Type III	Low-pressure systems (centrifugal chillers)
Universal	All system types (recommended for HVAC businesses)

• Exam cost: $150-$300 through EPA-approved testing organizations
• Certification is permanent (does not expire)
• Details: EPA Section 608 requirements

Step 3: Get Local HVAC Contractor Licenses

Since Illinois has no statewide HVAC license, each municipality sets its own requirements. You must check licensing rules in every city where you plan to work.

Chicago

Chicago requires a general contractor license with tiered insurance requirements:

• Class A: $5M per occurrence liability
• Class B: $3M per occurrence
• Class C: $1M per occurrence, $2M aggregate
• Class D: $1M per occurrence, $2M aggregate
• Class E: $1M per occurrence

Aurora

HVAC contractors must pass a licensing exam, provide proof of general liability + workers’ comp insurance, and post a $5,000 surety bond.

Other Municipalities

Most require proof of insurance and may require a local contractor license or permit. Always check with the municipal building department before starting work in a new jurisdiction.

Step 4: Get Insurance and Bonding

General Liability Insurance

• Average cost: $1,500-$4,000/year for HVAC businesses
• Typical coverage: $1M per occurrence / $2M aggregate minimum
• Required by: Most municipalities and virtually all commercial clients

Workers’ Compensation Insurance

• Required for ANY employees (no minimum threshold in Illinois)
• HVAC workers’ comp rates: Higher than many industries due to injury risk
• Penalties: Up to $500/day, minimum $10,000 fine
• Sole proprietors and LLC members can exempt themselves

Surety Bonds

• No statewide bonding requirement, but some municipalities require them
• Typical bond amounts: $5,000-$25,000
• Cost: $100-$500/year (1%-5% of bond amount)

Step 5: Register for Taxes

HVAC services that include installing tangible personal property (equipment) are generally subject to Illinois sales tax. Register through MyTax Illinois.

• State rate: 6.25% plus local taxes
• Repair-only services: May be treated differently depending on whether parts are installed
• Consult with a tax professional for your specific situation

Step 6: Pull Building Permits

HVAC installations require building permits from local building departments. Follow the International Mechanical Code (IMC) and local building codes. Inspections are typically required after installation.

Cost to Start an HVAC Business in Illinois

Item	Cost	Notes
LLC Formation	$150-$250	One-time ($250 for online expedited)
Federal EIN	Free	Online at IRS.gov
EPA 608 Certification (Universal)	$150-$300	One-time, permanent
Local HVAC Contractor License(s)	$100-$500	Per municipality, annual renewal
Local Business License(s)	$50-$500	Per municipality
Annual Report (SOS)	$75	Annual
General Liability Insurance	$1,500-$4,000/year	Required by most municipalities
Workers’ Comp (if employees)	$2,000-$8,000/year	Required with any employees
Surety Bond (if required locally)	$100-$500/year	Some municipalities require
HVAC Tools & Equipment	$5,000-$25,000	Recovery machines, gauges, meters, etc.
Service Vehicle	$15,000-$40,000	Used van or truck
Commercial Auto Insurance	$2,000-$5,000/year	Required for business vehicles
Marketing / Website	$500-$3,000	Optional at start
Estimated total: $26,625-$87,125

Related Illinois Business Guides

• Starting a Business in Illinois: Complete Guide

← Back to all Illinois business guides

Frequently Asked Questions

Does Illinois require a state HVAC license?

No. Illinois does not have a statewide HVAC contractor or technician license. However, many municipalities (including Chicago and Aurora) have their own local HVAC contractor licensing requirements, including exams, insurance, and bonding. Always check requirements in every city where you plan to work.

Do I need EPA 608 certification to start an HVAC business?

Yes. Federal law requires EPA Section 608 certification for anyone who services, maintains, repairs, or disposes of equipment containing refrigerants. The Universal certification covers all system types and is recommended for HVAC businesses. It’s permanent and costs $150-$300 for the exam.

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

Including a service vehicle, tools, insurance, and licensing, expect to invest approximately $26,625-$87,125 to get started. The largest costs are the service vehicle ($15,000-$40,000) and HVAC tools/equipment ($5,000-$25,000). The business formation itself is relatively inexpensive ($150-$250).

Do I need workers’ comp for HVAC employees in Illinois?

Yes. Illinois requires workers’ comp for any employer with even one employee – there is no minimum threshold. HVAC work is higher-risk, so expect higher premiums than many other industries. Penalties for non-compliance include up to $500/day with a minimum $10,000 fine.

What insurance do I need for an HVAC business in Illinois?

At minimum: general liability insurance ($1,500-$4,000/year), commercial auto insurance ($2,000-$5,000/year), and workers’ comp if you have any employees. Many municipalities require proof of liability insurance and may also require surety bonds ($5,000-$25,000 bond amounts).

Do I need a building permit for HVAC installations in Illinois?

Yes. HVAC installations require building permits from the local building department. You must follow the International Mechanical Code (IMC) and local building codes. Inspections are typically required after installation to verify code compliance.