How to Start an HVAC Business in Connecticut (2026)

Last updated: February 25, 2026

Connecticut has one of the most comprehensive and strictly enforced HVAC licensing systems in the United States, administered by the Department of Consumer Protection (DCP). The state requires licensure at every level – from apprentice through journeyperson through contractor. To operate an HVAC contracting business in Connecticut, you (or someone you employ) must hold a journeyperson HVAC license for at least two years before applying for a contractor license. While the pathway is rigorous, Connecticut’s high housing density and cold winters create strong, year-round demand for HVAC services.

HVAC Business Requirements in Connecticut at a Glance

Requirement	Agency	Cost	Timeline
LLC Formation	CT Secretary of the State	$120	1-3 business days
S-2 Journeyperson License (Unlimited)	CT Dept. of Consumer Protection (DCP)	$90 app + $120 initial	Pass exam first
Annual Journeyperson Renewal	CT DCP	$120/year (expires Aug 31)	Annual
S-1 Unlimited Contractor License	CT DCP	$150 app + $150 initial	2 years journeyperson experience
Annual Contractor License Renewal	CT DCP	$150/year (expires Aug 31)	Annual
EPA 608 Certification	EPA-approved certifier	$20-$100	Pass exam
Home Improvement Contractor (HIC)	CT DCP	$220/2 years	2-4 weeks
Workers’ Comp Insurance	Private carrier	Varies	Before first hire
General Liability Insurance	Private carrier	$1,000-$3,000+/year	Before starting

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

Step 1: Understand Connecticut’s HVAC License Structure

Connecticut’s DCP Heating, Piping, and Cooling licensing system has over 20 different license types organized by function and scope. For most HVAC businesses, the key licenses are:

License	Type	Scope	Prerequisite
S-2	Journeyperson (Unlimited)	All heating, piping, and cooling work	Exam + experience
S-1	Contractor (Unlimited)	All heating, piping, and cooling contracting	2 years as S-2 journeyperson
D-2	Journeyperson (Limited – Warm Air)	Warm air, air conditioning, refrigeration	Exam + experience
D-1	Contractor (Limited – Warm Air)	Warm air, A/C, refrigeration contracting	2 years as D-2 journeyperson

The S-1 Unlimited license is the most comprehensive and allows all heating, piping, and cooling work. The D-1 Limited is appropriate for businesses focusing on warm air heating, air conditioning, and refrigeration.

Step 2: Obtain Your Journeyperson License

Before you can hold a contractor license, you (or a qualifying employee) must be a licensed journeyperson for at least 2 years. To get the journeyperson license:

Pass the S-2 Journeyperson exam: 70 questions, 2.5-hour time limit, administered through the DCP testing system
Pay $90 application fee + $120 initial license fee
License expires August 31 annually; renewal fee is $120/year
No formal apprenticeship program is required but practical experience in the trade is necessary

Step 3: Get EPA Section 608 Certification

Federal law (Clean Air Act) requires technicians who handle refrigerants to be EPA Section 608 certified. To purchase refrigerants, you must be certified.

Universal Certification – covers Type I (small appliances), Type II (high-pressure systems), and Type III (low-pressure systems)
Take a proctored exam from an EPA-approved certifier (many HVAC training schools and trade associations offer it)
Cost: $20-$100 depending on provider
No expiration date on EPA 608 certification

Step 4: Form Your Business Entity

File your Certificate of Organization at business.ct.gov ($120). Get a free EIN from IRS.gov. Open a business bank account to separate business and personal finances.

Step 5: Apply for Your Contractor License

After working as a licensed journeyperson for at least 2 years, apply for the S-1 Unlimited Contractor License through CT DCP:

Submit contractor license application with proof of 2 years journeyperson experience
Pass the S-1 Contractor exam: 80 questions, 3-hour time limit
Pass the Business & Law exam: 50 questions, 2 hours (required for all contractor licenses)
Pay $150 application fee + $150 initial license fee
License expires August 31 annually; renewal fee is $150/year
Apply at: portal.ct.gov/dcp

Step 6: Register as a Home Improvement Contractor (HIC)

If you will perform HVAC work in residential properties, you must register as a Home Improvement Contractor (HIC) with CT DCP. Fee: $220 for a 2-year registration. This is separate from your professional HVAC contractor license. Both are required for residential work.

Step 7: Get Business Insurance

General Liability Insurance: Most clients and HIC registration require it. Minimum $500,000-$1 million per occurrence; $1-$2 million aggregate recommended for HVAC work. Annual cost: $1,000-$3,000+
Workers’ Compensation Insurance: Mandatory in Connecticut as soon as you hire your first employee. HVAC is a high-risk trade – workers’ comp rates will be higher than many industries.
Commercial Auto Insurance: Required for vehicles used for HVAC service calls and hauling equipment.
Commercial Umbrella Policy: Recommended for HVAC contractors given the potential for property damage or injury on job sites.

Step 8: Register for Taxes

Sales tax: HVAC installations on real property – CT rules on taxability of labor vs. materials vary. In general, materials are taxable; labor on capital improvements to real property may not be. Consult CT DRS for specifics.
Withholding tax and UI tax when you hire employees

Cost to Start an HVAC Business in Connecticut

Item	Cost	Notes
LLC formation	$120	One-time state fee
Annual report	$80/year	Due each year
S-2 Journeyperson license	$90 app + $120 initial = $210	Annual renewal $120
S-1 Contractor license	$150 app + $150 initial = $300	Annual renewal $150
EPA 608 Certification	$20-$100	No expiration
HIC Registration	$220/2 years	For residential work
General liability insurance	$1,000-$3,000+/year	$1M/$2M minimum recommended
Workers’ comp insurance	Varies	Mandatory from first employee
Commercial auto insurance	$1,500-$3,000+/year	For service vehicles
HVAC tools and equipment	$5,000-$30,000+	Manifold gauges, recovery machines, hand tools
Service vehicle	$15,000-$60,000+	New vs used work van/truck

Estimated total startup cost (excluding vehicle): $7,000-$40,000+

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Frequently Asked Questions

Do I need a license to do HVAC work in Connecticut?

Yes. Connecticut requires both journeyperson and contractor licenses to perform and contract HVAC work. The DCP regulates all Heating, Piping, and Cooling (HPC) licenses. To run an HVAC contracting business, you need (or must employ someone with) an S-1 Unlimited or D-1 Limited contractor license, which requires 2 years of prior experience as a licensed journeyperson.

What is the difference between S-1 and D-1 HVAC licenses in Connecticut?

The S-1 Unlimited Heating, Piping, and Cooling Contractor license covers all heating, piping, and cooling work with no scope restriction. The D-1 Limited Warm Air, Air Conditioning and Refrigeration Contractor license is limited to warm air heating, A/C, and refrigeration systems and excludes steam, hot water, and other piping work. Most full-service HVAC businesses pursue the S-1 Unlimited license.

How much does a Connecticut HVAC contractor license cost?

The S-1 Unlimited Contractor License costs $150 application fee + $150 initial license fee = $300. Annual renewal is $150/year. All licenses expire August 31. Before getting the contractor license, you need an S-2 Journeyperson license ($90 application + $120 initial, $120/year renewal) and at least 2 years of journeyperson experience.

Does CT HVAC require a Home Improvement Contractor registration?

Yes, if you work on residential properties. You need both a DCP HVAC contractor license AND a Home Improvement Contractor (HIC) registration ($220/2 years) to perform HVAC work in Connecticut homes. The HIC registration is a separate requirement from the professional HVAC license.

Do I need EPA 608 certification in Connecticut?

Yes – this is a federal requirement for all HVAC technicians. Under the Clean Air Act Section 608, any technician who handles refrigerants must be EPA 608 certified. Universal certification (covering all refrigerant types) is recommended. Take a proctored exam from an EPA-approved certifier. Cost: $20-$100. There is no expiration date on EPA 608 certification.

Is workers’ comp required for a Connecticut HVAC business?

Yes – Connecticut requires workers’ compensation insurance for any employer with even one employee. HVAC is classified as a high-risk trade, so workers’ comp rates are higher than for many other industries. Coverage must be from a qualified private carrier; Connecticut does not have a state insurance fund for workers’ comp.

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About the Author

Robert Smith has run a licensed private investigation firm for 8 years from the Florida-Georgia state line - where he learned firsthand how wildly business licensing rules differ between states just miles apart. He personally researched requirements across all 50 states and D.C., reviewing hundreds of government sources over hundreds of hours to build guides he wished existed when he started. Not a lawyer or accountant - just a business owner who has done the research so you don't have to.

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