Idaho HVAC License Requirements

Idaho's Three-Tier HVAC License System

Idaho structures its HVAC licensing through the Division of Occupational and Professional Licenses (DOPL), which administers three distinct credential levels: apprentice, journeyman, and contractor. Each tier unlocks different work authorizations, and the state enforces strict boundaries between them.

Registered Apprentice is the entry point. You must be at least 16 years old (with parental consent via the STRAP program) or 18 to register independently. Registration costs $10 and requires employment under a licensed HVAC contractor. The critical rule most people miss: only hours logged after your apprentice registration is active count toward licensing. Work performed before registration, or during any registration lapse, is permanently disqualified.

HVAC Journeyman is the working credential. A licensed journeyman can install, service, and repair heating, cooling, and ventilation systems — but only while employed by a licensed contractor. Journeymen cannot bid on jobs independently, contract directly with property owners, or pull mechanical permits.

HVAC Contractor is the business-operating credential. This license authorizes you to run a mechanical contracting firm, bid on projects, hire journeymen and apprentices, and pull permits under your own name or business entity. It requires an active Idaho HVAC Journeyman license and at least 24 months (or 4,000 hours) of qualifying experience before you can apply.

Two Pathways to the Journeyman License

Idaho offers two routes to qualify for the journeyman exam, and which one you follow depends on whether you attend a DOPL-approved trade school:

Apprenticeship School Pathway: Complete 576 classroom hours of related technical instruction (typically 144 hours per year across four years) at a DOPL-approved institution, plus 8,000 hours of supervised on-the-job training. Approved schools include College of Western Idaho in Nampa, College of Southern Idaho in Twin Falls, College of Eastern Idaho in Idaho Falls, North Idaho College's Workforce Training Center, and Idaho State University's Workforce Training program, among others.

Experience-Only Pathway: If you skip formal schooling, you need 16,000 hours of supervised field experience — double the OJT requirement of the school pathway. This route works for experienced technicians who learned entirely on the job, but the documentation burden is heavier since you'll need notarized work verification forms covering the full 16,000 hours.

Both pathways require that every hour of experience was earned under a licensed Idaho journeyman or contractor while your apprentice registration was active.

The Application Sequence That Trips People Up

Here's where Idaho's process catches people. Older DOPL application PDFs still instruct candidates to submit their application first and then schedule the exam. The current rule is reversed: you must register with PSI Services, schedule and pass the trade exam, and then submit your application to DOPL with your passing score report attached.

If you follow the legacy instructions and submit your application before passing the exam, DOPL will reject it. That means a wasted $35 application fee and weeks of processing delay while you resubmit correctly.

The exam itself is administered by PSI Services at testing centers in Boise, Coeur d'Alene, and Blackfoot. It costs $75 per attempt, allows four hours, and is open-book — but only physical reference materials bound in three-ring binders are permitted. No loose pages, sticky notes, or electronic devices.

Contractor License Requirements

To upgrade from journeyman to contractor, you need:

• An active Idaho HVAC Journeyman license, plus at least 24 months (or 4,000 hours) of documented active journeyman experience in Idaho or an equivalent recognized jurisdiction
• A passing score on the PSI HVAC Contractor exam (110 questions, 70% passing threshold, four hours)
• A passing score on the Business and Law exam
• A $2,000 HVAC compliance bond filed with DOPL on Form HVC-02A
• A $35 application fee
• Workers' compensation insurance if you employ any staff

If you're licensing a business entity rather than yourself individually, you'll need to designate a Qualifying Agent — a licensed journeyman who takes legal and technical responsibility for all work performed under the company's license.

What an HVAC License Does and Doesn't Cover

An unrestricted Idaho HVAC license covers warm air heating, cooling, heat pumps, boilers, pool heaters, gas piping, ductwork, exhaust venting, and mechanical controls. It does not cover general high-voltage electrical work or potable water plumbing.

The state grants specific limited exemptions under Idaho Code § 54-5015: HVAC licensees can run low-voltage control wiring (24 volts or less) on equipment up to 5 tons, and can make line-voltage connections from an existing disconnect to an HVAC unit if the disconnect is within line-of-sight and 50 feet. Installing the disconnect itself, modifying the main electrical panel, or connecting to domestic water supply lines requires the respective trade license.

Idaho also offers four specialty HVAC licenses — Hearth, Waste Oil, Fuel Gas Piping, and LP Gas Limited Heating — each with narrow technical scopes and their own exams.

Keeping Your License Current

Idaho is transitioning from annual to biennial renewals aligned with your birthday. During this transition, DOPL has implemented a fee holiday where timely renewals cost $0. Late renewals still incur full fees plus reinstatement penalties, so tracking your renewal date matters.

Idaho does not require continuing education for HVAC license renewals — one of the few states where this is the case. Your license stays valid as long as you renew on time and maintain any required bonding and insurance.

For a step-by-step walkthrough of the entire licensing process — from apprentice registration through contractor launch — the Idaho HVAC License Guide maps the current sequence with all the forms, fees, and timelines in one place.

See more Idaho guides →