HVAC Technician License in Connecticut — Requirements, Fees & Exam

How to get licensed as an HVAC technician in Connecticut: issuing board, requirements, exam, fees, renewal, and continuing education — verified from official sources.

Source-verified

Requirements below are drawn from Connecticut Department of Consumer Protection (DCP) - Heating, Piping, Cooling and Sheet Metal Work Examining Board (official site) and last verified July 24, 2026. Boards change fees and rules often — confirm before acting.

Requirements at a glance

Who must be licensed - Connecticut licenses the INDIVIDUAL, and only individuals may apply: Under CGS 20-334(a), no person may 'engage in, practice or offer to perform the work of any occupation subject to this chapter ... including offering to perform such work in any print, electronic, television or radio advertising or listing, unless such person has first obtained a license ... or possesses a card of registration from the Labor Department or the board' (an apprentice). CGS 20-337 confirms the credential is individual: business ownership need not be licensed, 'but all the work and services set forth in section 20-330 shall be performed by persons licensed for such work or occupation under this chapter.' The DCP application page states plainly: 'Only individuals can apply, company applications are not accepted.' There is no blanket exemption for an employee of a licensed contractor - an employed technician must hold either a trade license or an apprentice card of registration.
Journeyperson pathway (registered apprenticeship + exam): A journeyperson (e.g., S-2 unlimited; D-2 warm air/AC/refrigeration; D-4 cooling) must complete a registered apprenticeship program - not less than four years' experience in the trade for the unlimited license - or equivalent experience and training, and pass the applicable state licensure examination (CGS 20-334a(a)(2); DCP scope pages). Apprentices register with the Connecticut Department of Labor. A person completing the apprenticeship must apply for the first licensure examination given after completion; an apprentice permit is revoked if the holder fails three exams in a one-year period and does not sit the next one (CGS 20-333(b)).
Contractor pathway (two years as a licensed journeyperson + exam): A contractor (e.g., S-1, D-1, D-3) must have served as a journeyperson in the trade for not less than two years - or furnish satisfactory evidence of education and experience - and pass an examination demonstrating competence in the trade (CGS 20-334a(a)(1); DCP scope pages). A contractor licensee must furnish the board or department with evidence of compliance with state workers' compensation and unemployment insurance requirements before the license issues (CGS 20-334a(a)(1)(C)).
Examination (individual exam; vendor fee is separate): Every individual applicant must pass the applicable state licensure examination(s) for the license type - the department conducts such written, oral and practical examinations as the board deems necessary (CGS 20-333(b)). The DCP application page states: 'Every individual applicant must take an exam(s) - Please note: Separate fees will be due to the exam vendor at time of exam registration.' The DCP does not publish the vendor's exam fee, so no dollar amount for the exam is stated here.
No state trade bond; workers' compensation and unemployment insurance evidence required: Chapter 393 imposes no state surety bond on a heating/piping/cooling trade license itself (a bond and registration under Chapter 400 apply separately to 'home improvement contractors'). A contractor applicant must, however, furnish evidence that the licensee will comply with all state workers' compensation and unemployment insurance requirements, and that evidence must be available to any properly interested person before a contractor license issues (CGS 20-334a(a)(1)(C)).
Annual renewal (expires August 31) and NO continuing education: All heating, cooling and sheet metal work licenses expire annually on August 31 (DCP application page; CGS 20-335 - 'All such licenses shall expire annually'). Renewal fee: contractor $150; journeyperson $120. A license may be renewed if the application is received no later than one month after expiration; a license unrenewed for more than two years is reinstated only by re-qualifying under CGS 20-333. Connecticut imposes NO continuing-education requirement on these HVAC licenses - the statutory CE mandate (CGS 20-334d) applies only to electricians and plumbers, and no CE regulation exists for the heating/piping/cooling or sheet-metal trades.
Statewide validity; municipal building permits still apply: A Connecticut trade license is valid throughout the state: 'Any person licensed under this chapter shall be permitted to perform the work or occupation covered by such license in any town or municipality of this state without further examination or licensing by any town or municipality' (CGS 20-338). Local building permits remain required, however: a contractor who applies for a building permit for work required to be performed by a licensed person must cause that work to be performed by such a licensed person (CGS 20-338a), and work may not commence until the permit is obtained (CGS 20-338c).
Reciprocity - none in practice: Although CGS 20-333a authorizes the Commissioner to grant a license without examination to a person holding a substantially similar out-of-state license where that state extends the same courtesy, the DCP application page states flatly: 'Connecticut does not have reciprocal agreements with any other jurisdiction.' An out-of-state licensee therefore applies under 'equivalent experience and training' or 'equivalent out of state license' and still sits the Connecticut examination.

Legal basis

Connecticut Department of Consumer Protection (DCP) - Heating, Piping, Cooling and Sheet Metal Work Examining Board administers HVAC technician licensing in Connecticut. Every figure below is verified against the board’s own official pages and dated. Who must personally hold a credential — the contractor, the business, or the individual worker — is set out under Requirements.

What it’s called

Connecticut does not issue a credential literally named ‘HVAC license’; the state licenses the trade as ‘heating, piping and cooling work’ (and, for warm-air/AC/refrigeration, ‘warm air, air conditioning and refrigeration’ work) under lettered codes issued by the Department of Consumer Protection to an INDIVIDUAL. The classic HVAC pairing is S-1 (Unlimited Heating, Piping and Cooling Contractor) / S-2 (Unlimited Heating, Piping and Cooling Journeyperson) and D-1 (Limited Warm Air, Air Conditioning and Refrigeration Contractor) / D-2 (its journeyperson); D-3/D-4 cover limited cooling/refrigeration and S-9/S-10 a limited heating-cooling scope. Searchers’ folk terms - ‘HVAC license,’ ‘AC license,’ ‘D-1 license,’ ‘S-1 license,’ ‘refrigeration license,’ ‘heating and cooling license’ - map to these DCP heating/piping/cooling codes. Note that in Connecticut a ‘contractor’ license (e.g., S-1, D-1) is an INDIVIDUAL occupational license earned by examination after journeyperson experience - only individuals may apply, not companies - and it is NOT the same as a Chapter 400 home improvement contractor registration. Separately, EPA Section 608 refrigerant-handling certification is a FEDERAL credential for handling refrigerant, not a Connecticut license and not a substitute for a DCP heating/piping/cooling license.

License types & fees

Type	Experience	Exam	Fee
S-1 Unlimited Heating, Piping and Cooling Contractor / S-2 Unlimited Heating, Piping and Cooling Journeyperson	S-2 (journeyperson): completion of a registered apprenticeship program (not less than four years' experience in the trade) or equivalent experience and training, plus the licensure exam. S-1 (contractor): two (2) years as a properly licensed journeyperson, or equivalent experience and training, plus the exam (CGS 20-334a(a); DCP Heating, Piping and Cooling scope page).	State licensure examination for the license type; separate exam fees are paid to the department's exam vendor at registration (the DCP does not publish the vendor's fee).	Application fee (non-refundable): S-1 contractor $150; S-2 journeyperson $90. Initial license fee after passing the exam: contractor $150; journeyperson (any other license) $120. Annual renewal: contractor $150; journeyperson $120 (CGS 20-333, 20-335). Scope (DCP): 'The holder of this license may do all heating, piping and cooling work as defined in section 20-330 of the Connecticut General Statutes,' including any sheet-metal work as defined in 20-330 - this is the broadest, uncapped HVAC credential.
D-1 Limited Warm Air, Air Conditioning and Refrigeration Contractor / D-2 Limited Warm Air, Air Conditioning and Refrigeration Journeyperson	D-2 (journeyperson): completion of a registered apprenticeship program or equivalent experience and training, plus the exam. D-1 (contractor): two (2) years as a properly licensed journeyperson, or equivalent experience and training, plus the exam (DCP scope page).	State licensure examination; vendor exam fee paid separately at registration.	Application: D-1 contractor $150; D-2 journeyperson $90. Initial license: contractor $150; journeyperson $120. Annual renewal: contractor $150; journeyperson $120. Scope (DCP): 'installation, repair, replacement, maintenance or alteration of any warm air, air conditioning and refrigeration system, including necessary piping for the conveyance of heating or cooling media and associated pumping equipment. LP gas supplied by gas containers and/or natural gas piping, approved gas appliances, gas utilization equipment and accessories are included ... This license does not include the installation or servicing of oil burners of any size.' Includes sheet-metal work within its limits. This D-1/D-2 pair is the credential most commonly meant by 'HVAC license' in Connecticut.
D-3 Limited Cooling Contractor / D-4 Limited Cooling Journeyperson	D-4: completion of a registered apprenticeship program or equivalent experience and training. D-3: two (2) years as a properly licensed journeyperson or equivalent (DCP scope page).	State licensure examination; vendor exam fee separate.	Application $150 (D-3) / $90 (D-4); initial license $150 / $120; annual renewal $150 / $120. Scope (DCP): 'installation, repair, replacement, maintenance or alteration of all refrigeration systems included in food storage, air conditioning, or special process systems. This limited license does not include LP gas supplied by gas containers, natural gas, or servicing of oil burners of any size.' Includes sheet-metal work within its limits.
S-9 Limited Heating Cooling Contractor / S-10 Limited Heating Cooling Journeyperson	S-10: completion of a registered apprenticeship program or equivalent experience and training. S-9: two (2) years as a properly licensed journeyperson or equivalent (DCP scope page).	State licensure examination; vendor exam fee separate.	Application $150 (S-9) / $90 (S-10); initial license $150 / $120; annual renewal $150 / $120. Scope (DCP): heating systems, boilers and steam apparatus/piping, hot/chilled/condenser water and steam piping in air-conditioning systems, for buildings not over three stories high with a total heating load not exceeding 500,000 BTU's and steam pressure not exceeding fifteen (15) pounds, and/or cooling installations up to 35 tons per system; includes gas piping and sheet-metal work within its limits.
S-3/S-4 and S-7/S-8 Limited Heating (Cooling and Piping) Contractor / Journeyperson	Journeyperson (S-4, S-8): completion of a registered apprenticeship program or equivalent. Contractor (S-3, S-7): two years as a licensed journeyperson or equivalent (DCP scope page).	State licensure examination; vendor exam fee separate.	Application $150 (contractor) / $90 (journeyperson); initial license $150 / $120; renewal $150 / $120. Scope (DCP): heating apparatus/piping, boilers and steam, fuel/gas piping, and hot/chilled/condenser water and steam piping in air-conditioning systems, but EXCLUDING refrigeration systems, affiliated piping and refrigerants used within air-conditioning systems (S-7/S-8 add a 3-story / 500,000 BTU / 15-psi cap). Includes sheet-metal work within its limits.
Related Chapter 393 credentials: B-1/B-2/B-3/B-4 Gas and Oil Burner; G-1/G-2 gas piping; PP-1/PP-2 process piping; OE-2 operating engineer; SM-1 through SM-6 sheet metal	Each pairs a contractor tier (2 years as a licensed journeyperson or equivalent) with a journeyperson tier (registered apprenticeship or equivalent); OE-2 is issued on equivalent experience and training (DCP scope pages).	State licensure examination for the specific code; vendor exam fee separate.	Same fee structure: application $150 contractor / $90 journeyperson; initial license $150 / $120; renewal $150 / $120. Scopes (DCP): B-1..B-4 gas or oil burner work (B-1/B-2 domestic and light-commercial up to 500,000 BTU; B-3/B-4 any size); G-1/G-2 gas piping and approved gas appliances; PP-1/PP-2 process piping for products for human consumption; OE-2 on-site operation of boilers over 15 psi or AC/refrigeration systems over 50 hp / 200 lb refrigerant; SM-1..SM-6 standalone sheet-metal/ductwork (the D and S licenses already include sheet-metal work within their own limits).

Who does NOT need this license — exemptions

Connecticut licenses HVAC as an individual occupational credential under CGS chapter 393; there is no blanket ’employee of a licensed contractor needs nothing’ exemption - CGS 20-334(a) requires every person to hold a license OR ‘a card of registration from the Labor Department or the board’ (an apprentice) before performing the work. Two scope carve-outs sit in the DEFINITION of ‘heating, piping and cooling work’ (CGS 20-330(5)): it ‘does not include solar thermal work performed pursuant to a certificate held as provided in section 20-334g, or medical gas and vacuum systems work or the passive monitoring of heating, air conditioning or refrigeration systems’; ‘millwright work’ (20-330(23)) is likewise excluded. The express exemptions are in CGS 20-340, which enumerates nineteen; ‘The provisions of this chapter shall not apply to:’ the HVAC-relevant ones are - (1) ‘Persons employed by any federal, state or municipal agency’; (5) persons in ’the installation, maintenance, repair and service of electrical or other appliances of a size customarily used for domestic use where such installation commences at an outlet receptacle or connection previously installed by persons licensed to do the same and maintenance, repair and service is confined to the appliance itself and its internal operation’; (6) ’employees of industrial firms whose main duties concern the maintenance of the … heating, piping, cooling work, sheet metal work … of such firm on its own premises or on premises leased by it for its own use’; (11) THE OWNER-OCCUPANT EXEMPTION - ‘persons engaged in the installation, maintenance, repair and service of … heating, piping, cooling and sheet metal equipment in and about single-family residences owned and occupied or to be occupied by such persons; provided any such installation, maintenance and repair shall be subject to inspection and approval by the building official of the municipality in which such residence is located and shall conform to the requirements of the State Building Code’; and (16) A SHEET-METAL/DUCTWORK CARVE-OUT - ‘sheet metal work performed in residential buildings consisting of six units or less by new home construction contractors registered pursuant to chapter 399a, by home improvement contractors registered pursuant to chapter 400 or by persons licensed pursuant to this chapter, when such work is limited to exhaust systems installed for hoods and fans in kitchens and baths, clothes dryer exhaust systems, radon vent systems, fireplaces, fireplace flues, masonry chimneys or prefabricated metal chimneys rated by Underwriters Laboratories or installation of stand-alone appliances including wood, pellet or other stand-alone stoves that are installed in residential buildings by such contractors or persons.’ The remaining exemptions are (2) public-service-company employees performing utility-service work, (3) employees of specially chartered municipal corporations, (4) contractor employees performing electrical-line or emergency work for a public service company, (7) industrial-firm employees fabricating equipment used to produce goods for sale (with a human-consumption exception), (8) persons doing work necessary to manufacture or repair apparatus produced for sale or lease, (9) stage/theatrical and (10) carnival/circus electrical work, (12) through (15) various glass-work exemptions, (17) employees hoisting, placing and anchoring solar collectors under a licensed solar contractor, (18) swimming-pool maintenance and repair authorized under section 20-417aa, and (19) any Connecticut Airport Authority employee covered by a state collective-bargaining agreement. Chapter 393 contains NO small-dollar or ‘minor job’ price threshold exemption.

Fees

Fees are set by statute and confirmed on the DCP application page. Non-refundable APPLICATION fee: $150 for a contractor’s license (e.g., S-1, D-1, D-3, S-9) and $90 for a journeyperson’s license (e.g., S-2, D-2, D-4, S-10) - CGS 20-333(a). INITIAL LICENSE fee, paid after passing the examination: $150 for a contractor and $120 for any other (journeyperson) license - CGS 20-335. ANNUAL RENEWAL fee: $150 for a contractor and $120 for a journeyperson (DCP application page; CGS 20-335). So obtaining a contractor license costs about $300 in state fees ($150 application + $150 license) and a journeyperson about $210 ($90 + $120), before the separate exam-vendor fee. A separate examination fee is paid to the department’s exam vendor at registration; the DCP does not publish that figure, so it is omitted here rather than guessed. There is no state trade-license surety bond (contractor applicants instead furnish evidence of workers’ compensation and unemployment insurance compliance under CGS 20-334a(a)(1)(C)).

Exam

Every individual applicant must pass the applicable Connecticut state licensure examination(s) for the license type sought; the department conducts such written, oral and practical examinations as the Heating, Piping, Cooling and Sheet Metal Work Examining Board deems necessary to test the applicant’s knowledge (CGS 20-333(b)). The DCP application page states that ‘Every individual applicant must take an exam(s)’ and that ‘Separate fees will be due to the exam vendor at time of exam registration.’ The DCP does not publish the exam vendor’s fee, so no exam-fee dollar amount is stated here (omitted rather than guessed). A person completing a registered apprenticeship must apply for the first licensure examination given after completion; an apprentice permit is revoked if the holder fails three examinations within a one-year period and does not sit the next examination offered (CGS 20-333(b)).

Renewal & continuing education

Annual. All heating, cooling and sheet metal work licenses expire on August 31 each year (DCP application page; CGS 20-335 provides that all such licenses ‘shall expire annually,’ with renewals staggered under CGS 21a-10(b)). Renewal fee: $150 for a contractor and $120 for a journeyperson. A board may renew a license if the renewal application is received no later than one month after the expiration date; a licensee who has failed to renew for more than two years must re-qualify under CGS 20-333 (i.e., meet the current examination and application requirements). No continuing education is required to renew a heating/piping/cooling or sheet-metal license. None for heating/piping/cooling or sheet-metal (HVAC) licenses. Connecticut’s statutory continuing-professional-education mandate, CGS 20-334d, applies ONLY to electricians and plumbers; there is no CE section or regulation for the heating/piping/cooling (S/D/G/PP/OE) or sheet-metal (SM) trades, and CGS 20-335 conditions renewal only on completing ‘any continuing professional education required under sections 20-330 to 20-341 … or any regulations adopted thereunder’ - of which there is none for these HVAC licenses. (EPA Section 608 refrigerant-handling certification is a separate FEDERAL credential, not a Connecticut license.)

How to apply

Applications are handled by Connecticut Department of Consumer Protection (DCP) - Heating, Piping, Cooling and Sheet Metal Work Examining Board. Start at the official application page .

Frequently asked questions

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

Yes. HVAC is ‘heating, piping and cooling work’ (and, for warm-air/AC/refrigeration, licensed under the D codes) regulated by the Department of Consumer Protection under Connecticut General Statutes chapter 393. CGS 20-334 makes it unlawful to perform - or even advertise or offer to perform - that work without a license or an apprentice card of registration. Connecticut licenses the INDIVIDUAL: only individuals may apply (company applications are not accepted), and CGS 20-337 requires all covered work to be performed by licensed persons even though the business itself need not be owned by one.

What is the Connecticut HVAC license actually called?

Connecticut does not issue a card literally named ‘HVAC license.’ The classic HVAC credentials are the S codes - S-1 (Unlimited Heating, Piping and Cooling Contractor) and S-2 (its journeyperson) - and the D codes - D-1 (Limited Warm Air, Air Conditioning and Refrigeration Contractor) and D-2 (its journeyperson). D-3/D-4 cover limited cooling and refrigeration, and S-9/S-10 a limited heating-cooling scope (up to 35 tons of cooling, 500,000 BTU heating). For most residential and light-commercial HVAC work, the D-1/D-2 warm-air/AC/refrigeration license is the one people mean by ‘HVAC license.’

How much does a Connecticut HVAC license cost?

In state fees, a contractor license (e.g., S-1 or D-1) costs a $150 non-refundable application fee plus a $150 initial license fee - about $300 - and a journeyperson license (e.g., S-2 or D-2) costs a $90 application fee plus a $120 initial license fee - about $210. Renewals are annual: $150 for a contractor and $120 for a journeyperson, with all these licenses expiring August 31. A separate examination fee is paid to the department’s exam vendor at registration; the DCP does not publish that amount. There is no state trade-license surety bond.

What experience and exam does Connecticut require?

A journeyperson must complete a registered apprenticeship program (not less than four years for the unlimited S-2, or an equivalent for a limited license) and pass the state licensure exam. A contractor must have served two years as a licensed journeyperson - or show equivalent experience and training - and pass the contractor exam. Apprentices register with the Connecticut Department of Labor. Every applicant sits the exam; there is no company or business-only path, because Connecticut licenses the individual.

Does Connecticut require continuing education for an HVAC license?

No. Connecticut’s continuing-education statute (CGS 20-334d) applies only to electricians and plumbers, and there is no CE requirement or regulation for the heating/piping/cooling or sheet-metal trades. Renewal (annually, by August 31) requires only the renewal fee. Note that EPA Section 608 refrigerant-handling certification is a separate federal requirement for technicians who handle refrigerant - it is not a Connecticut license and does not substitute for one.

Can a homeowner or an employee do HVAC work without a license in Connecticut?

A homeowner can, within limits: CGS 20-340(11) exempts persons installing, maintaining, repairing and servicing heating, piping, cooling and sheet-metal equipment ‘in and about single-family residences owned and occupied or to be occupied by such persons,’ provided the work is subject to inspection and approval by the municipal building official and conforms to the State Building Code. An employee is NOT automatically exempt - Connecticut requires each worker to hold a license or an apprentice card of registration (CGS 20-334). Other narrow exemptions cover industrial-firm maintenance employees working on their own premises (20-340(6)) and certain residential exhaust/vent/chimney and stand-alone-stove sheet-metal work (20-340(16)). There is no small-dollar ‘minor job’ exemption.

See every license and certification LicensingAtlas covers in Connecticut.

Sources & verification

Last verified against these sources: July 24, 2026.

LicensingAtlas states licensing and certification requirements categorically from official sources. It is a reference, not legal or career advice, and requirements change frequently — confirm details with the issuing board before you act.