How to Start an HVAC Business in Idaho

The Prerequisites Before You Can Start

You can't just file for an LLC and start bidding on HVAC jobs in Idaho. The state requires that anyone operating an HVAC contracting business hold an active HVAC Contractor license through the Division of Occupational and Professional Licenses (DOPL). To qualify for that license, you must first hold an active Idaho HVAC Journeyman license and have at least 24 months (or 4,000 hours) of qualifying documented experience in Idaho or an equivalent recognized jurisdiction.

If you haven't met the 24-month/4,000-hour qualifying-experience threshold yet, you cannot skip ahead. DOPL verifies the experience against the contractor application, and applications submitted before the threshold are rejected.

Step 1: Register Your Business Entity

Start with the Idaho Secretary of State. Choose and, if applicable, register your business structure — such as an LLC or corporation — and file any Assumed Business Names (DBA registrations) you plan to operate under. LLC registration is done online through the Secretary of State's website.

Next, obtain an Employer Identification Number (EIN) from the IRS for tax purposes. Then register with the Idaho State Tax Commission to handle state withholding taxes, payroll taxes, and sales tax obligations. Equipment sales to clients are taxable in Idaho, so your sales tax account needs to be active before your first invoice.

Step 2: Pass the Contractor Exams

Idaho requires two PSI exams for the contractor license:

HVAC Contractor Trade Exam: 110 multiple-choice questions, four hours, 70% passing score, open-book. Required references include the 2018 International Mechanical Code, 2018 International Fuel Gas Code, DBS Contractor's Business & Law Manual, and Idaho HVAC Statutes/Rules.

Business and Law Exam: Tests knowledge of Idaho business regulations, contract law, and licensing administration.

Each exam costs $75 per attempt. Remember the current sequence: register with PSI and pass both exams before submitting your DOPL contractor application. The older "apply first, test later" instructions on some DOPL PDFs are outdated.

Step 3: Apply for the HVAC Contractor License

Submit your contractor application to DOPL with:

• Passing score reports for both PSI exams
• Proof of at least 24 months (or 4,000 hours) of qualifying active journeyman experience in Idaho or an equivalent recognized jurisdiction
• The $35 non-refundable processing fee

If you're applying as a business entity rather than an individual, you'll designate a Qualifying Agent — a licensed journeyman who takes legal and technical responsibility for all work performed under the company's license. The Qualifying Agent must hold an active Idaho HVAC Journeyman license with the required qualifying experience in Idaho or an equivalent recognized jurisdiction.

Step 4: File the Compliance Bond

Before DOPL will activate your contractor license, you must file a $2,000 HVAC compliance bond on Form HVC-02A. This surety bond guarantees your work conforms to state mechanical codes.

The bond is purchased through a surety company. Premiums run approximately $100 per year or $250 for three years — no credit check required for the $2,000 face value. The bond must remain effective for your entire licensing period; a lapse triggers license suspension.

Step 5: Secure Insurance

General liability insurance: While DOPL only requires the compliance bond at the state level, city building departments where you'll pull permits commonly require proof of general liability insurance, often with a $300,000 to $500,000 single-limit minimum depending on local requirements. This is effectively mandatory for any operating contractor.

Workers' compensation insurance: Required by Idaho law if you employ anyone — full-time, part-time, temporary, seasonal, or family members. Sole proprietors without employees can file an exemption statement. The moment you hire your first employee, coverage must be in place immediately.

Step 6: Register Locally

If your projects exceed $2,000 in value and include work beyond the narrow HVAC trade scope, you need a separate general contractor registration through the Idaho Contractors Board ($50 fee, requires proof of $300,000 GL insurance and workers' comp). Registered contractors must display their registration number on all job sites, advertising, contracts, and permits.

You'll also need to register with the building departments of any cities where you plan to pull mechanical permits. Boise, Meridian, Nampa, and other incorporated cities with building programs each have their own local contractor registration process. These typically require your DOPL license number, proof of insurance (COI), and a local registration fee.

Public Works Licensing (Optional)

If you plan to bid on government projects — public schools, municipal buildings, state facilities — where the mechanical contract exceeds $2,000, you'll need a Public Works Contractor License from DOPL. This comes in four classes based on your desired bid limit:

• Class D: up to $50,000 (requires $3,000 working capital, $10,000 net worth)
• Class C: up to $200,000 (requires $7,500 working capital, $25,000 net worth)
• Class CC: up to $400,000 (requires $25,000 working capital, $75,000 net worth)
• Class B: up to $1,500,000 (requires $50,000 working capital, $150,000 net worth)

Public works licensing adds financial statement requirements, reference letters, and an additional Business and Law exam. Most new HVAC contractors skip this initially and add it later as their business grows into government work.

The Realistic Timeline

From the point where you have your journeyman license and 24 months of experience, expect the business launch process to take four to eight weeks:

• PSI exam registration and testing: 1–3 weeks depending on availability
• DOPL application processing: 2–4 weeks
• Bond issuance: 1–3 business days
• Insurance setup: 1–2 weeks
• Local registrations: varies by city

The biggest delays come from exam scheduling (popular slots fill quickly) and DOPL processing (which slows during high-volume periods). Don't commit to your first project until your license is officially issued.

The Idaho HVAC License Guide maps the complete contractor launch sequence with a timeline tracker, checklist, and all the forms and registrations needed to go from journeyman to operating business.

See more Idaho guides →