How to Start an HVAC Business in Idaho: Journeyman, Contractor and Specialty Licenses

If you plan to run an HVAC business in Idaho, you deal with two separate state systems. The Idaho Division of Occupational and Professional Licenses (DOPL) issues the certificates that let a person install, service and repair heating, ventilation and air conditioning equipment. The Idaho Secretary of State registers the business entity that owns the company. Keep these tracks separate in your planning, because they use different forms, different fees and different renewal dates.

This guide covers the order we recommend: choose the right certificate, meet its hour, exam or bond requirements, then set up the business, tax accounts and local permits. The HVAC rules sit in Idaho Code 54-50 and IDAPA 24.39.70. This article is informational content, not legal or tax advice. Rules and fees change, so confirm every figure on the agency page before you pay or file. If your company will have employees, several crews, or both HVAC and gas piping work, talk with a qualified attorney or CPA before you finalize the structure.

What you need before you start

Gather these items before you file anything. A missing document is the most common reason an Idaho HVAC license application stalls.

• Proof of hours. Employer letters, timesheets or job logs that show your apprentice or field hours by date and type of work. Confirm the format DOPL accepts at dopl.idaho.gov/hvac.
• Instruction records. Transcripts or completion certificates for approved instruction. The journeyman path requires 576 hours of approved instruction.
• An EIN from the IRS. Ask your CPA whether your business needs one. Most businesses with employees do.
• An Idaho registered agent with a physical Idaho street address. P.O. boxes are not accepted.
• A business name that passes Secretary of State name rules, plus a backup choice in case the first is taken.
• A surety bond quote if you are applying for a contractor certificate. The bond amount is $2,000. The premium you pay the surety is set by the surety, so ask for a quote.
• Insurance quotes. Insurance requirements depend on your operation. Ask an insurance agent what your crew size and work type require.

Fees at a glance

DOPL fees below are the 2026 figures published by DOPL. Secretary of State fees are the filing fees listed for each filing. Confirm each one before you pay.

Item	Fee	Agency
Apprentice certificate	$10	DOPL
Application	$35	DOPL (confirm which applications it covers)
Journeyman certificate, initial	$150	DOPL
Journeyman certificate, renewal	$75	DOPL
Contractor certificate, initial	$225	DOPL
Contractor certificate, renewal	$150	DOPL
Compliance bond	$2,000 bond amount (premium set by the surety)	Surety
LLC Certificate of Organization	$100 online, $120 on paper	Secretary of State
Assumed business name (DBA)	$25 online, $45 on paper	Secretary of State
Name reservation	$20, good for 120 days	Secretary of State
LLC annual report	No fee, required every year	Secretary of State

Step 1: Choose the certificate you need

DOPL issues HVAC certificates of competency at three levels: apprentice, journeyman and contractor. It also issues specialty classes. Under Idaho Code 54-5008, working without the required certificate is unlawful. The level you need depends on what you will do with your own hands and what your crew will do.

Ask DOPL directly how the rule applies to an owner who manages jobs but does not perform installs or service. Do not assume that answer. A common setup is an owner who holds a journeyman certificate and works as the lead technician, or an owner who holds a contractor certificate and employs certified journeymen. Match the plan against what DOPL says about your role.

Step 2: Meet the Idaho HVAC journeyman license requirements

The journeyman certificate has two routes. Both require passing the journeyman exam.

1. Pass the exam, plus 8,000 apprentice hours and 576 hours of approved instruction.
2. Pass the exam, plus 16,000 hours of HVAC experience.

Plan the timeline around the hours. At 2,000 hours a year of full-time field work, 8,000 hours is about four years and 16,000 hours is about eight. That is arithmetic, not a DOPL figure. Part-time or seasonal work stretches the timeline.

Log hours from your first day of employment. Reconstructing old hours from memory is slow and invites questions. Start the apprentice certificate early. DOPL issues apprentice certificates for $10, and an apprentice record gives you a documented starting point. Confirm the apprentice process on the DOPL HVAC page before you start.

Step 3: Pass the exam

The exam provider, schedule, passing score and any exam cost are set by DOPL. Confirm the exam details, eligibility window and study materials on dopl.idaho.gov/hvac before you schedule. Study the codes and standards DOPL names for the exam, and use practice questions in the same format. A failed exam costs time, so treat the exam as the gate it is.

Step 4: Apply for the Idaho HVAC contractor license

The contractor certificate has two named requirements: pass the contractor exam and post a $2,000 compliance bond. The initial fee is $225 and the renewal fee is $150.

Check the DOPL page for any other prerequisites, such as experience, before you file.

The bond comes from a surety. Get quotes from a surety that writes Idaho bonds. The premium is what you pay the surety, and it is separate from the $2,000 bond amount. Ask the surety whether it needs your business entity on file before it issues the bond. If it does, complete Step 7 first.

Step 5: Add specialty classes if you need them

Specialty classes cover narrower work. The specialty journeyman class for hearth and gas piping requires either 2,000 hours plus an exam, or 60 hours of fuel gas code education. Check which route fits your experience before you enroll in a course.

Liquid propane (LP) gas safety falls under a separate board, not the DOPL HVAC Board. If your work involves LP gas systems, confirm with that board what you need before you do the work. Do not assume an HVAC certificate covers LP gas work.

Step 6: File with DOPL and plan for the renewal change

Apply through DOPL, pay the application fee and the initial certificate fee, and keep copies of everything you submit. HVAC permits and inspections are also bought from DOPL, so set up that purchase path before your first job.

DOPL announced on 2026-10-08 that HVAC certificates move to two-year renewals starting 2026-10-30, with fees adjusted to whole years. Check dopl.idaho.gov/hvac for your renewal cycle and the fee that applies to it before you calendar a renewal date.

Step 7: Form the business entity

The Secretary of State is where the company gets its legal existence. Idaho has no state general business license, so registering an entity is a registration, not a license. An LLC is a common choice for a service business. The Certificate of Organization for a limited liability company costs $100 online or $120 on paper. File through SOSBiz.

Name rules matter. The name must contain the phrase limited liability company or limited company, or the abbreviation LLC, L.L.C., LC or L.C. Ltd. and Co. are allowed. The name must be distinguishable from existing, reserved and registered names on the Secretary of State records. Entity words like LLC or Inc. do not count toward distinguishability. The name may not falsely state or imply government affiliation, so skip words that suggest state certification or approval. Search the records at sosbiz.idaho.gov/search/business before you choose.

Your registered agent must have a physical Idaho street address and be available during normal business hours. You can act as your own registered agent if you have an Idaho address. A DBA cannot serve as a registered agent.

Standard processing is about 7 to 10 days from filing. Expedited options carry surcharges: $40 for evidence of filing within 8 working hours, and $100 for same-day service on filings received before 1:00 p.m. Mountain time. Check the processed-through-date page on SOSBiz for current estimates.

If you form a corporation instead, the Articles of Incorporation filing fee is $100. The annual report applies to corporations too.

Step 8: File a DBA if you need one

If your trade name differs from the LLC name, file a Certificate of Assumed Business Name, the Idaho DBA, with the Secretary of State. It is filed statewide, not with the county. Online filing is $25 and paper filing is $45, which includes a $20 manual data entry surcharge. An assumed business name stays active until you cancel it and is not subject to renewal.

If you want to hold a name before filing, the Secretary of State offers a name reservation for $20, good for 120 days.

Step 9: Register for taxes

Idaho has a flat 5.3% income tax and a 6% state sales tax. There is no local sales tax outside voter-approved resort cities. If your business will collect sales tax, apply for a sales tax permit through the Idaho Business Registration portal at tax.idaho.gov/ibr. Confirm with the Idaho State Tax Commission which of your charges are taxable before you start invoicing.

A default LLC is a pass-through entity, so members report Idaho income on their personal returns. An LLC that files a partnership or S corporation return owes the $10 permanent building fund tax. An LLC taxed as a C corporation pays the 5.3% business income tax plus the $10 permanent building fund tax. Your CPA should choose the structure with you.

Step 10: Check city and county rules

Idaho has no state general business license, and counties issue no general business license. City rules differ. Some cities require a general business license or permit, and others license only specific activities. This guide has not verified which Idaho cities license HVAC work or require a general license at your location, so do not treat any city as a yes or no.

Call the City Clerk in each city where you will work and ask two questions: Do you require a general business license? Do you license HVAC or any other trade activity? The Business Wizard at business.idaho.gov generates a checklist of agencies and permits for a specific activity. It is a starting point, not a substitute for the City Clerk's answer.

Step 11: Build one compliance calendar

Put every recurring obligation on one calendar:

• LLC annual report. No fee, but required. Due each year before the end of the month in which the Certificate of Organization became effective, beginning one year after formation.
• DOPL renewal. Under the new two-year cycle for HVAC, starting 2026-10-30. Confirm your date on the DOPL page.
• Bond renewal. If you hold a contractor certificate, follow the terms your surety sets.
• Sales tax filings, if you hold a sales tax permit.
• City license renewals, for any city that requires one.

Missing the LLC annual report is an easy mistake in year two, because the fee is zero and nothing reminds you.

Where the work is

New-build demand in the Treasure Valley, the metro area around Boise that includes Meridian, Nampa, Caldwell, Eagle, Kuna and Star, is one reason HVAC owners look at the region. Demand moves with construction cycles. Check current permit activity and talk with local builders before you commit to equipment, a truck or hires.

Common mistakes to avoid

• Working before the certificate is issued. Under Idaho Code 54-5008, working without the required certificate is unlawful. Waiting for the certificate costs less than defending a violation.
• Logging hours loosely. Hours without dates, job types or employer confirmation are hard to defend if DOPL questions them.
• Assuming a county license covers you. Counties issue no general business license, but cities may have their own rules.
• Using a DBA as your registered agent, or using a P.O. box for the registered agent. Neither is allowed.
• Naming the company to imply government approval. Names may not falsely state or imply government affiliation.
• Missing the annual report. It is required every year, even though the fee is zero.
• Calendaring the old renewal cycle. HVAC moves to two-year renewals starting 2026-10-30.
• Confusing HVAC with LP gas. LP gas safety is a separate board, so an HVAC certificate may not cover LP work.
• Buying HVAC permits from the wrong office. HVAC permits and inspections come from DOPL.

Tips that save time

• Ask the surety early whether it needs your LLC on file before quoting the bond.
• Use expedited Secretary of State service only when you need it. The surcharges are $40 and $100, and they do not speed up DOPL review.
• Keep one folder with hour records, instruction certificates, fee receipts, filing confirmations and renewal notices.
• Reserve your name for $20 if you need time to finish paperwork. The reservation lasts 120 days.
• Ask DOPL, in writing if possible, how the owner-role question applies to you. A written answer is easier to rely on than a phone call.

What to expect

A complete setup generally gives you a clear path to perform HVAC work under the certificate you hold, a registered Idaho entity, and a calendar that helps keep the company in good standing. Results depend on your documented hours, your exam performance, your city's rules and your local market. Nothing here guarantees a certificate, an approval date or business income. DOPL review times vary, so ask DOPL for current timing before you schedule work or a start date.

Next steps

1. Confirm your role and the certificate you need on dopl.idaho.gov/hvac.
2. Start an hours log and an apprentice record if you are not yet certified.
3. Check name availability on the SOSBiz business search, then file the entity.
4. Call the City Clerk in each city where you plan to work.
5. Talk with a qualified attorney or CPA about structure, taxes and any employee questions.

Disclaimer: This article is informational content, not legal or tax advice. Idaho licensing rules, fees and deadlines change. Confirm each figure with the agency named before you act, and consult a qualified attorney or CPA for complex situations.