HVAC Installation Requirements in Connecticut
Connecticut HVAC installation: the heating/cooling family licenses at ANY price under ch. 393 — S-1/S-2 unlimited ('576 + 12,000 / 576 + 8,000' hours), S-9/S-10 limited to three stories and 35 tons, D-1/D-2 'excluding oil-burner installation or service', B-1/B-2 capped at '500,000 BTU's', B-3/B-4 any capacity, G-1/G-2 gas piping and SM-1…SM-6 sheet metal — annual expiry August 31, and NO statutory continuing education anywhere in the family (§ 20-334d is drafted for electricians and plumbers only — a scoped absence, confidence reported). If gas hearth products are touched, § 20-420(d) demands the limited contractor or journeyman gas hearth installer licence even for a home improvement contractor. The permit runs through the mechanical/Fuel Gas subcode at the municipal building official, and the owner-occupant exemption (§ 20-340(11)) reaches work 'in and about single-family residences owned and occupied' — inspection preserved. Every claim sourced.
01 The requirements, sourced
- Heating/cooling is a CARVED family: S (unlimited), D (warm air, no burners), B (burners by capacity), G (gas piping), SM (sheet metal) — DCP's heating scope page (machine-read 2026-10-12) carves the trade into families rather than nesting them: 'S-1 UNLIMITED HEATING, PIPING, AND COOLING CONTRACTOR' (576 + 12,000 hours) and S-2 (576 + 8,000); S-9/S-10 limited to buildings 'no more than three stories' with cooling 'up to 35 tons per system'; D-1/D-2 warm air, air conditioning and refrigeration 'but excluding oil-burner installation or service' (D-2 = 432 + 4,000 hours); B-1/B-2 gas and oil burners 'five gallons or less per hour or for systems with a total heating load not exceeding 500,000 BTU's' (B-2 = 288 + 2,000 hours); B-3/B-4 burners 'of any size and/or capacity' (B-4 = 4,000 + 360 hours); G-1/G-2 LP-gas and natural-gas piping systems; SM-1…SM-6 sheet metal. § 20-334f additionally requires a limited gas hearth installer licence for a home improvement contractor performing gas hearth product work (see REQ-CT-GAS-HEARTH-001). S-CT-DCP-HVAC-SCOPE
- No continuing education for heating, cooling or sheet metal (verified absence — § 20-334d reaches only electricians and plumbers) — Connecticut requires NO continuing education from heating, piping, cooling or sheet metal licensees. The statutory basis is a scoped absence: § 20-334d is titled 'Continuing professional education requirements for electricians and plumbers' and its subsections (a)–(b) address electricians and (c)–(d) plumbers, with no third trade named anywhere in the section. DCP publishes continuing-education pages for exactly two families — electricians and plumbers — and its heating/cooling page lists no CE duty. Elevator, sheet metal, irrigation, sprinkler, glass and well drilling licensees are in the same position. S-CT-DCP-HVAC
- A home improvement contractor may not do gas hearth product work without the § 20-334f licence (§ 20-420(d)) — § 20-420(d) verbatim: 'On and after July 1, 2008, a home improvement contractor shall not perform gas hearth product work, as defined in subdivision (22) of section 20-330, unless such home improvement contractor holds a limited contractor or journeyman gas hearth installer license pursuant to section 20-334f.' The registration is NOT enough for that slice of a remodel — the trade licence overlays it even for a registered contractor. S-CT-CGA-400
- The owner-occupant exemption is narrow: single-family, owned AND occupied, and inspected (§ 20-340(11)) — § 20-340(11) verbatim: the chapter does not apply to 'persons engaged in the installation, maintenance, repair and service of glass or electrical, plumbing, fire protection sprinkler systems, solar, 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.' Read against the closed nineteen-item list, three consequences follow (confidence `reported` on the reading, `confirmed` on the text): the exemption reaches only SINGLE-FAMILY residences; the residence must be OWNED AND OCCUPIED (or to be occupied) by the person doing the work; and it never removes the municipal inspection or the State Building Code. A landlord, a two-family owner or a working partner who does not live there has no exemption anywhere in § 20-340. S-CT-CGA-393-SUP
- Permits are municipal, must be in hand before the work, and licensed trade work on a permit must be done by licensees (§§ 20-338a–20-338c, 29-263) — § 20-338a verbatim: 'Any contractor who applies for a building permit from a local building official for any work required to be performed by a person licensed under the provisions of this chapter, shall cause such work to be performed by a person licensed under the provisions of this chapter.' § 20-338b: the permit application is signed by the licensed contractor or by an agent carrying an ORIGINAL letter on the contractor's letterhead — 'The letter shall not be a copy or a facsimile' — naming the municipality, job, start date, contractor, agent and every licence number; electronic applications are allowed (as amended by P.A. 23-114). § 20-338c: 'No person licensed pursuant to sections 20-330 to 20-341 … shall commence work … unless each applicable permit … has been obtained as required pursuant to local ordinances and the general statutes.' § 20-417h adds the new-home permit gate. DCP: 'Many home improvement projects will require a building permit from the town … The permit must be in hand before the work begins'; permit applications answer to § 29-263 and the State Building Code adopted under § 29-252; DAS maintains the local building-officials list. S-CT-DCP-BUILDING
02 Which credentials this project can touch
| Credential | Relation | Rule | Source |
|---|---|---|---|
| Limited Gas and Oil Burner Contractor (DCP, B-1/B-2) | alternative | CT-HVAC | S-CT-DCP-HVAC-SCOPE |
| Unlimited Heating, Piping and Cooling Contractor (DCP) | may require | CT-HVAC | S-CT-DCP-HVAC-SCOPE |
| Gas Piping Contractor (DCP, G-1/G-2) | alternative | CT-HVAC | S-CT-DCP-HVAC-SCOPE |
Each row is one (project, classification, relation) triple the research record can source — the rendered sections and the seeded evidence can never disagree.
03 Deterministic rules applied
- CT-HVAC
- CT-CONTINUING-EDUCATION
- CT-TRADE-EXEMPTIONS
- CT-TRADE-LICENSE
- CT-LOCAL-PERMITS
Connecticut carries 3 conflict rows — CONFLICT-CT-001 (E-2 classroom hours 720-vs-576, UNRESOLVED), CONFLICT-CT-002 (the $360 new-home composition) and CONFLICT-CT-003 (the $220 HIC label) — published beside every answer rather than resolved by guesswork.
04 What it costs
| Fee | Amount | Source |
|---|---|---|
| Home Improvement Guaranty Fund fee — annual (statutory component) § 20-432(b) verbatim: 'Each contractor (1) who receives a certificate pursuant to this chapter, or (2) receives a certificate pursuant to chapter 399a and has opted to engage in home improvement … shall pay a fee of one hundred dollars annually to the guaranty fund.' Salespersons pay $40. | $100 | S-CT-CGA-400 |
| Home improvement contractor registration — the $220 DCP charges (application + guaranty fund) DCP application page verbatim: 'Non-refundable application fee: $220.00'. Composition per statute: $120 (§ 20-421(b)) + $100 (§ 20-432(b)) — CONFLICT-CT-003 records the label difference and its resolution. Both numbers are official; only the composition differs. | $220 | S-CT-DCP-HIC-APP |
| Home improvement contractor registration — annual renewal DCP renewal page verbatim: 'All registrations expire annually on March 31st. The annual renewal fee is $220.00.' § 20-417b(d)(1) sets the same 31 March expiry for the new-home registration, and both renewal lanes live on one DCP page. | $220 | S-CT-DCP-RENEWAL |
| Trade licence — initial licence fee, any other licence § 20-335 verbatim: '… or a fee of one hundred twenty dollars for any other such license. Any such initial license fee shall be waived for persons who present a recommendation for review issued pursuant to section 31-22u.' | $120 | S-CT-CGA-393 |
| Trade licence — annual renewal, any other licence § 20-335 verbatim: '… and of one hundred twenty dollars for any other such license.' DCP publishes $120 on each trade renewal line. | $120 | S-CT-CGA-393 |
| Elevator licence — application, contractor / journeyperson DCP verbatim: 'Application fee for contractor is $150.00 (Non-Refundable). Application fee for journeyperson is $90.00 (Non-Refundable)'; renewal $150/$120; 'All elevator work licenses expire annually on August 31st.' The same $150/$90 pattern appears on the electrical, plumbing and heating pages — one statutory table, five pages. | $150 | S-CT-DCP-ELEVATOR |
| Well drilling registration — application (W-1…W-4, W-7, W-8) DCP verbatim: 'The application fee for all well drilling registration types is $88.00, with the exception of the W-5 and W-6.' Registrations expire annually on 30 April and require a passing score on the Department's written examination. | $88 | S-CT-DCP-WELL |
| New Home Construction Guaranty Fund fee — annual (statutory component) § 20-417i(b) verbatim (2026 supplement): 'Each person who receives a certificate pursuant to sections 20-417a to 20-417j, inclusive, shall pay a fee of two hundred forty dollars annually to the New Home Construction Guaranty Fund. Such fees shall be payable with the fee for an application for a certificate or renewal of a certificate.' | $240 | S-CT-CGA-399A-SUP |
| New home construction registration — the $360 DCP charges (statute: $120 + $240; the page labels them the other way round) DCP new-home page verbatim: 'New non-refundable registration fee: $360.00 ($240.00 registration fee & $120.00 guaranty fund fee)'. The TOTAL matches the statute ($120 § 20-417b(b) + $240 § 20-417i(b) = $360) but the page's parenthetical transposes the two labels — CONFLICT-CT-002, resolved_with_method in favour of the statutory composition. DCP adds that including home-improvement services on the same registration costs $100. | $360 | S-CT-DCP-NHCA |
| Trade licence — application fee, contractor-class licence (E-1, P-1, S-1, SM-1, R-1, PV-1 …) § 20-333(a) verbatim: 'a nonrefundable application fee of one hundred fifty dollars for a license under subdivision (1) of subsection (a), subdivisions (1) and (2) of subsection (b), subdivision (1) of subsection (c) and subdivisions (1), (2) and (3) of subsection (e) of section 20-334a.' Waived for a § 31-22u recommendation for review. | $150 | S-CT-CGA-393 |
| Trade licence — application fee, journeyman-class licence (E-2, P-2, S-2, apprentice permit …) § 20-333(a) verbatim: 'a nonrefundable application fee of ninety dollars for a license under subdivisions (2) and (3) of subsection (a) and subdivision (4) of subsection (e) of section 20-334a.' | $90 | S-CT-CGA-393 |
| Trade licence — initial licence fee, contractor's licence § 20-335 verbatim: 'Any person who has successfully completed an examination for such person's initial license under this chapter shall pay to the Department of Consumer Protection a fee of one hundred fifty dollars for a contractor's license …'. Waived for a § 31-22u recommendation for review. | $150 | S-CT-CGA-393 |
| Trade licence — annual renewal, contractor's licence § 20-335 verbatim: the board may renew 'upon payment to the department of a renewal fee of one hundred fifty dollars in the case of a contractor' if the application arrives within one month of expiry. DCP's electrical, plumbing, heating and elevator pages publish the same $150. | $150 | S-CT-CGA-393 |
| Trade examination — PSI vendor price NOT PUBLISHED on any DCP page (duty verified) PRICE WITHHELD BY NAME (research §J.1): DCP's exam page says 'CONSTRUCTION TRADES … Examinations: PSI Bulletins' and each trade page adds 'Separate fees will be due to the exam vendor at time of exam registration' — no amount is published on any official Connecticut page read on 2026-10-12, so this row records the duty with amount 0 = 'unpublished', never a guess. | not published | S-CT-DCP-EXAM |
| Well drilling registration — application, W-5 and W-6 DCP verbatim: 'The fee for W-5 and W-6 registration types is $50.00' — the only ch. 393 construction credential priced below the $90 floor. | $50 | S-CT-DCP-WELL |
| Home improvement contractor registration — application fee (statutory component) § 20-421(b) verbatim: 'Each application for a certificate of registration as a home improvement contractor shall be accompanied by a fee of one hundred twenty dollars, except that no such application fee shall be required in any year during which such person has paid the registration fee required under section 20-417b or in any year in which such person's registration as a new home construction contractor is valid.' § 20-421(d) waives it for a contractor of record acting solely for a business entity. DCP collects $120 + the $100 Guaranty Fund as one $220 payment — CONFLICT-CT-003. | $120 | S-CT-CGA-400 |
| New home construction contractor registration — application fee (statutory component) § 20-417b(b) verbatim: 'Each such application shall be accompanied by a fee of one hundred twenty dollars, except that no such application fee shall be required if such person has paid the registration fee required under section 20-421 during any year in which such person's registration as a new home construction contractor would be valid.' P.A. 21-197 cut this fee from $240 to $120 effective 2022-07-01; renewal equals the application fee (§ 20-417b(d)(1)). | $120 | S-CT-CGA-399A |