Connecticut HVAC License Requirements (2026)

The Connecticut Department of Consumer Protection (DCP) Occupational and Professional Licensing Division licenses individual heating, piping and cooling (HVAC) tradespeople statewide under Conn. Gen. Stat. §20-330 et seq. Connecticut uses a tiered occupational license system: apprentice registration, S-2 Journeyperson Heating, Piping and Cooling (unlimited HVAC scope, must work under an S-1 contractor), and S-1 Unlimited Heating, Piping and Cooling Contractor (independent contracting authority). Candidates must complete a four-year registered apprenticeship of 8,000 hours of on-the-job training plus 576 hours of related classroom instruction, then pass a PSI examination. The S-1 contractor upgrade requires the S-2 plus two additional years of journey-level experience.

The Licensing Authority

Connecticut Department of Consumer Protection — Occupational and Professional Licensing Division (DCP) is the statutory authority responsible for issuing and enforcing this license under Conn. Gen. Stat. §20-330 et seq. (Occupational Licensing: electrical, plumbing, heating and cooling trades); Conn. Gen. Stat. §20-418 et seq. (Home Improvement Act); Conn. Gen. Stat. §20-417a et seq. (New Home Construction Contractors Act). The Connecticut Department of Consumer Protection registers home improvement and new home construction contractors, licenses individual electrical, plumbing and heating/cooling tradespeople, administers the Home Improvement Guaranty Fund, and conducts disciplinary proceedings for all contractor trades statewide.

Official portal: https://portal.ct.gov/DCP
Address: 450 Columbus Boulevard, Suite 901, Hartford, CT 06103
Phone: (860) 713-6135

Baseline Eligibility

The threshold requirements are straightforward: age 18 or above, plus a valid Social Security Number. No Connecticut residency requirement.

Good moral character

DCP reviews prior discipline and felony convictions. Prior occupational discipline from any jurisdiction must be disclosed.

Background investigation

Criminal history disclosure required on the application.

Experience and Education Requirements

The experience bar is 4 years of S-2 Journeyperson: four years (8,000 hours) of registered apprenticeship on-the-job training plus 576 hours of related classroom instruction. S-1 Unlimited Contractor: S-2 license plus two additional years of journey-level experience under an S-1 contractor., and it must be backed by verifiable records — typically payroll, tax, project, or supervisor documentation covering the claimed period.

Accepted proof of experience or eligibility

Connecticut Department of Labor Office of Apprenticeship Training (CTDOL) completion certificate
Signed Experience Verification Form from each S-1 supervising contractor
W-2 statements and pay stubs covering the qualifying period
Related instruction transcripts from an approved technical school or trade union program
EPA Section 608 refrigerant handling certification (for work on refrigerant systems)

Education substitution

Graduation from an accredited HVAC-R technology program may substitute for a portion of the classroom hours but not for the 8,000 on-the-job hours.

The Licensing Examination

The exam, administered by PSI Services LLC (under contract to DCP), breaks into the parts shown below — all must be passed before licensure:

Connecticut S-2 Journeyperson Heating, Piping and Cooling Examination — International Mechanical Code and Connecticut amendments — 80 questions, 240 minutes, passing score 70%
Connecticut S-1 Unlimited Heating, Piping and Cooling Contractor Examination — business and law, IMC, Connecticut amendments — 100 questions, 300 minutes, passing score 70%

Examination fee: $90 per PSI examination paid on the day of testing.

Retake policy: Failed examinations may be retaken by paying a new $90 fee. Each application remains valid for one year.

Financial Security and Insurance

No statewide contractor license surety bond is required for this credential in the cited sources. Project-specific, permit, or public-works bonds may still apply, so confirm bonding before bidding a given job.

General liability

DCP does not impose a state-level general liability minimum. Municipalities and project owners commonly require $500,000 to $1,000,000 per occurrence.

Workers' compensation

Workers' compensation insurance is mandatory in Connecticut under Conn. Gen. Stat. §31-284 for any employer with one or more employees.

Additional financial requirements

No financial statement required.

Fee Schedule

Fee	Amount
Application (non-refundable)	$90
Examination	$90
Initial license	$150
Renewal (every year)	$150

License Renewal

The Connecticut S-2 Journeyperson Heating, Piping and Cooling and S-1 Unlimited Heating, Piping and Cooling Contractor must be renewed every year. The fee to renew is presently $150. Connecticut HVAC licenses renew annually. License numbers must appear on every mechanical permit application.

Continuing education: Connecticut does not mandate statewide continuing education for S-2 or S-1 licenses. EPA 608 certification does not expire but must be retained.

Downloadable Asset

2026 Connecticut HVAC License Roadmap (PDF) — a printable step-by-step checklist for the application process.

Download the PDF roadmap →

Reciprocity Map

Connecticut grants no NASCLA reciprocity for this classification.

Reciprocal State	Accepted Exam	Conditions
Massachusetts	Trade exam waived	Bilateral reciprocity for active Massachusetts HVAC/refrigeration credentials in good standing.
Rhode Island	Trade exam waived	Bilateral reciprocity for active Rhode Island heating and cooling credentials.
New Hampshire	Trade exam waived	Bilateral reciprocity with comparable NH experience and exam requirements.
Maine	Trade exam waived	Bilateral reciprocity with Maine oil and solid fuel / propane and natural gas credentials where comparable.
Vermont	Trade exam waived	Bilateral reciprocity for active Vermont heating and cooling license holders.

Connecticut maintains bilateral reciprocity with all five surrounding New England states. Reciprocal applicants still must pay Connecticut fees and complete a Connecticut jurisprudence portion.

Weighing more than one jurisdiction? The national hub compares HVAC license requirements in every state — exam, bond, fee, and experience thresholds side by side.

The Licensing Roadmap

Register as a heating, piping and cooling apprentice. Register with the Connecticut Department of Labor Office of Apprenticeship Training or an approved joint apprenticeship committee.
Complete 8,000 hours of on-the-job training. Four years of full-time registered apprenticeship under a licensed S-1 contractor.
Complete 576 hours of related classroom instruction. At an approved technical high school, community college, or union training center.
Obtain EPA Section 608 certification. Required for handling refrigerants under federal Clean Air Act rules.
Apply for the S-2 Journeyperson license. File the DCP application with the apprenticeship completion certificate and $90 examination fee.
Pass the PSI S-2 Journeyperson examination at 70%. 80 questions covering the International Mechanical Code and Connecticut amendments.
Work two years then upgrade to S-1. Two additional years of journey-level experience under an S-1 contractor, then pass the 100-question S-1 business, law, and technical exam.

Preparation Resources

These materials are drawn from the regulator's own citations and the references applicants commonly use to prepare. CLR receives no compensation for listing them.

International Mechanical Code, Connecticut-adopted edition — International Code Council. Primary technical reference. Open-book at PSI test centers.
International Fuel Gas Code, Connecticut-adopted edition — International Code Council. Tested alongside the IMC for fuel gas scope questions.
Connecticut State Building Code — Mechanical Amendments — Connecticut Department of Administrative Services. State-specific modifications tested on the exam.

Before Filing: A Checklist

Before submitting to DCP, the applicant should have each of the following ready:

☐ Registered apprenticeship enrollment with Connecticut DOL
☐ 8,000 hours of documented on-the-job training under an S-1 contractor
☐ 576 hours of related classroom instruction transcript
☐ EPA Section 608 refrigerant certification
☐ DCP S-2 Journeyperson application with $90 fee
☐ PSI S-2 Journeyperson exam pass certificate at 70%+
☐ PSI S-1 Unlimited Heating, Piping and Cooling Contractor exam pass certificate

Common Application Pitfalls

These are the recurring mistakes that most often delay or reject a Connecticut HVAC application, based on the official instructions cited here.

Under-documenting apprenticeship hours

DCP requires verified, employer-signed hour logs. Informal or reconstructed hour records are routinely rejected.

Skipping EPA 608 certification

Federal refrigerant-handling certification is a prerequisite for any refrigerant work. Connecticut licensure does not replace it.

Expecting the S-2 to authorize independent work

An S-2 Journeyperson must work under an S-1 contractor. Independent contracting requires the S-1 upgrade.

Confusing HVAC with separate limited licenses

Connecticut issues narrower D-class (oil burner), G-class (gas piping), and B-class (sheet metal) licenses. The S-class covers full heating, piping and cooling scope.

Ignoring the annual renewal

Connecticut renews every year, not every two or three. Missing the annual renewal lapses the license and any dependent contractor registration.

Other Connecticut Trade Licenses

Looking at a different trade? CLR also publishes these Connecticut licensing guides:

Answers to Common Questions

What does the Connecticut S-1 and S-2 license cover?

Heating, piping and cooling — what most states call HVAC. S-2 is the Journeyperson (unlimited scope under supervision). S-1 is the Unlimited Heating, Piping and Cooling Contractor (independent contracting authority).

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

Four years of registered apprenticeship (8,000 hours on-the-job plus 576 classroom hours) to reach S-2, then two additional years of journey-level experience to qualify for the S-1 contractor license.

Does Connecticut reciprocate HVAC licenses?

Yes. Connecticut maintains bilateral reciprocity with Massachusetts, Rhode Island, New Hampshire, Maine, and Vermont. Reciprocal applicants still must pay Connecticut fees.

Do I need EPA certification in addition to the Connecticut license?

Yes. Federal EPA Section 608 certification is required for anyone who handles refrigerants. Connecticut licensure does not replace the EPA certification.

How often does the Connecticut S-1 license renew?

Every year. Renewal is required annually.

Primary Sources

Regulatory requirements on this page are drawn from the official board, statute, and exam-provider materials listed below.

Verified 2026-06-13 · Next scheduled review 2026-09-11