How to Start an HVAC Business in Ohio: OCILB HVAC and Refrigeration Licenses

If you want to start an HVAC business in Ohio, the license question comes first, and right now it is a moving target. Ohio does not issue one general HVAC license that covers every kind of work. Commercial HVAC, hydronics, and refrigeration contracting is licensed by the Ohio Construction Industry Licensing Board (OCILB) through the Ohio Department of Commerce. Residential HVAC is excluded from that state system and is handled under local rules. This guide covers the state licensing steps, the business formation steps, and the tax and insurance steps that go with them.

This article is informational content, not legal or tax advice. Licensing rules, fees, and deadlines change. Confirm every figure with the agency named before you spend money, sign a lease, or buy equipment. For complex situations, consult a qualified Ohio attorney and a CPA.

Read This First: The OCILB Licensing Deadline

Check the status of the OCILB before you plan around an Ohio HVAC contractor license. Under Ohio Revised Code 101.62, the Legislative Service Commission lists the board's licensing functions as expiring on December 31, 2026, with a wind-down period running to June 30, 2027. Substitute House Bill 59 of the 136th General Assembly would renew the board for six years. As of October 2026 it was in Senate committee, and we found no enactment. Do not assume the board will license new applicants or renew licenses after 2026 without confirming it first.

Before you apply, look up the current status on the OCILB page of the Ohio Department of Commerce. If the question is still open, call or write the board and ask how the sunset affects new applicants and annual renewals.

What You Need Before You Start

Gather these items before you file anything. Most delays come from missing paperwork, not from the state being slow.

• Government-issued photo ID and your Social Security number or federal Employer Identification Number (EIN)
• Proof of at least five years working as a tradesperson: dated employer letters, job records, and references who can confirm your work
• Proof of contractor liability insurance, with the form and minimum amounts confirmed with OCILB
• The $25 exam application fee, submitted on the OCILB application form
• An EPA Section 608 certification card or certificate for refrigerant work
• A business name, a structure decision, and a budget for the $99 Articles of Organization filing if you form an LLC
• An Ohio registered agent (called a statutory agent in Ohio) with a street address
• A $39 name reservation, if you need to hold the name for 180 days while you finish paperwork
• A calendar for annual renewal and 10 hours of continuing education each year

Step-by-Step: Getting Licensed and Set Up in Ohio

Step 1: Confirm Which License You Need

OCILB issues separate HVAC, hydronics, and refrigeration contractor licenses under Ohio Revised Code 4740.01. These licenses cover commercial work only. Residential HVAC is excluded from OCILB licensing and is governed by local rules, so ask your city or county building department what it requires for home installs and repairs. Those rules and fees vary from one jurisdiction to another.

Decide which trades you will perform. A shop that does rooftop units for commercial clients and furnace work for homeowners will need to satisfy two different sets of rules. Ask OCILB how it licenses a company compared with the individual who qualifies it, so you know whose name goes on the license and whose exam and experience count.

Step 2: Meet the Experience Requirement

Under Ohio Revised Code 4740.06, an applicant must be at least 18 years old and must have five years of experience as a tradesperson. A registered engineer with three years of business experience may qualify through that route instead. Document your experience as you go. Keep dated employment records, letters from former supervisors, and copies of permits or job records that show your name on the work. Board staff can reject a vague reference, so ask for specifics: the employer, the dates, and the type of work performed.

Step 3: Get Contractor Liability Insurance

Ohio Revised Code 4740.06 requires contractor liability insurance. Talk to an insurance agent who writes contractor policies, and ask them to explain what the board will accept as proof of coverage. Do not assume a general commercial policy meets the requirement. Confirm the minimum coverage amounts with OCILB before you buy a policy, and keep the policy in force for as long as you hold the license.

Step 4: Pass the Trade Exam and the Business and Law Exam

An applicant must pass the trade exam for the relevant specialty (HVAC, hydronics, or refrigeration) and a separate business and law exam. The OCILB application carries a $25 exam application fee. The exam fee and renewal fee are not confirmed here, so check the current figures with OCILB before you pay.

Study from current material. Some study guides are out of date, and exam content can change. Compare any guide against the OCILB's published exam information before you rely on it. Schedule the exam only after you have confirmed the board's current status under the sunset issue described above.

Step 5: Get EPA Section 608 Certification

EPA Section 608 certification is a separate federal requirement, not part of the Ohio license. Anyone who handles refrigerants must hold it, including technicians who service, repair, or dispose of equipment that could release refrigerant. The EPA certifies technicians by type of equipment, so choose the type that matches the systems you will work on. Verify the current testing and certification requirements with the EPA before you schedule the test.

Step 6: Form Your Business Entity

Many HVAC owners operate as an LLC. An Ohio LLC is formed by filing Articles of Organization for a Domestic Limited Liability Company (Form 610) with the Ohio Secretary of State. The filing fee is $99. File through Ohio Business Central at https://www.ohiobusinesscentral.gov/, which is the fastest standard route. Regular service takes 3 to 7 business days from receipt. Expedited options exist: Expedite Service 1 costs $100 above the filing fee and processes within 2 business days, Expedite Service 2 costs $200 and processes within 1 business day, and Expedite Service 3 costs $300, requires in-person delivery, and processes within 4 hours if received by 1:00 p.m. A preclearance review costs $50 and takes 1 to 2 business days. Expedited filings go to P.O. Box 1390, Columbus, OH 43216.

Choose the name carefully. The name must include the words limited liability company or an approved abbreviation such as LLC, L.L.C., limited, ltd., or ltd. It must be distinguishable on Secretary of State records from other registered names. Search the records at https://businesssearch.ohiosos.gov/ before you commit. A $39 name reservation holds the name for 180 days.

Every Ohio LLC must appoint a statutory agent. The agent must be an Ohio resident or an entity with an Ohio business address. The address must be a street address. A post office box does not qualify, even with a street address attached. The Secretary of State will not accept articles without the written appointment and the agent's signed acceptance. Changing the agent or the agent's address costs $25. An Ohio LLC does not file an annual report.

If you incorporate instead, the initial Articles of Incorporation for a Domestic For-Profit Corporation (Form 532A) carry the same $99 filing fee. Corporations also do not file an annual report. Talk with an attorney before choosing between an LLC and a corporation, because the choice affects liability, taxes, and how you bring in partners.

Step 7: Register a Trade Name If You Need One

If you will operate under a name that does not match your legal entity name, register it as a trade name or fictitious name (Form 534A). Register it with the Ohio Secretary of State, not the county. The registration fee is $39.00, online through Ohio Business Central or by mail. Renewal costs $25.00 every five years, and an update or change of registrant name costs $25.00.

Step 8: Set Up Your Tax Registrations

Ohio issues no single general state business license. Your tax obligations depend on how you sell and how you are organized.

• Vendor's license: If you sell taxable goods, such as equipment or parts sold to customers, you may need a vendor's license before your first taxable sale. The county vendor's license application fee is $50 as of April 9, 2025, obtained through the Ohio Business Gateway or the county auditor. Confirm with the Ohio Department of Taxation at https://tax.ohio.gov/ which of your sales require it.
• Commercial Activity Tax (CAT): Ohio has no franchise tax and no LLC annual tax. Instead, businesses pay the CAT, a gross receipts tax of 0.26% on Ohio taxable gross receipts. For tax year 2025 and later, only businesses with more than $6 million of Ohio taxable gross receipts owe the CAT or must register. CAT returns are filed quarterly. Most small shops fall below that line, but confirm your figures with a CPA if you are near it.
• Income tax on business profit: Ohio has no corporate income tax. Taxable business income is taxed at a flat 3% through the personal income tax. Confirm the current rules with the Department of Taxation, because the rules changed for tax year 2026.
• Municipal net profit tax: Many cities and villages tax business net profit at their own rates. Check with the city where your shop is located, and with any city where you do regular work.

Step 9: Buy Workers' Compensation Coverage

Workers' compensation in Ohio is purchased from the state workers' compensation fund administered by the Bureau of Workers' Compensation (BWC). If you hire employees, set up BWC coverage before your first day of work. Ask BWC how coverage applies to owners and partners in your structure. Do not assume a private policy from another carrier will satisfy the requirement.

Step 10: Check Local Permits and Registrations

Counties issue no general business license, and Ohio does not issue a statewide general contractor license. Cities and some counties may still require their own contractor registration, permits for each installation, or inspections. Contact the building department for every city where you plan to work. Ask for the permit fee schedule in writing and for the inspection sequence for a typical job.

Step 11: Plan Your Annual Renewal and Continuing Education

OCILB licenses renew annually. Under Ohio Revised Code 4740.05, licensees must complete 10 hours of continuing education each year. Keep certificates from every course, and track the renewal date for each license you hold. Confirm the renewal fee with OCILB, since the fee is not stated here. Given the 2026 sunset, confirm that renewal will still be processed under the rules in effect when your license comes due.

How to Verify an Ohio HVAC Contractor License

Whether you are hiring a subcontractor, selling to a general contractor, or checking a competitor, verify the license before you rely on it. Ask for the license number and confirm the license type, status, and expiration date through the OCILB page of the Ohio Department of Commerce. If the agency's current search tool is unavailable, call the board and ask for written confirmation. A license that cannot be verified should be treated as unverified.

Expected Results

A business that follows these steps in order may be able to reach a position where it can bid commercial HVAC work, file its entity paperwork, and set up its tax accounts without gaps. Results depend on the board's processing times, exam scheduling, the local rules where you work, and your own preparation. The Secretary of State's regular filing timeline is 3 to 7 business days, but the state licensing timeline is not stated here and may be longer. Plan your launch date with buffer time, and do not sign commercial contracts until your license status is confirmed.

Common Mistakes to Avoid

• Assuming one state HVAC license covers both commercial and residential work. It does not, and residential work follows local rules.
• Ignoring the OCILB sunset. Confirm the board's status before you pay exam fees or sign a lease.
• Using a post office box as the registered agent address. Ohio requires a street address.
• Registering a trade name with the county instead of the Secretary of State.
• Assuming the vendor's license fee is still $25. The fee is $50 as of April 9, 2025.
• Letting contractor liability insurance lapse. Keep the policy active for as long as you hold the license.
• Handling refrigerant without EPA Section 608 certification, even when a helper or apprentice does the work.
• Hiring employees before setting up BWC coverage.
• Missing your annual renewal or your 10 hours of continuing education.

Practical Tips

• Start your experience file now. Board reviewers can only credit experience you can document.
• Reserve your name with the $39 reservation before you order signs, vehicles, or a website domain.
• Use the expedited filing options only when you need them. The regular 3 to 7 business day route is the lowest-cost standard path.
• Ask the Ohio SBDC Network for business planning help at https://clients.ohiosbdc.ohio.gov/. The SBA's Ohio district page at https://www.sba.gov/district/ohio lists regional resources as well.
• Ask each city where you plan to work for its contractor registration and permit requirements in writing.
• Set calendar reminders for the CAT quarterly filings if your receipts approach the $6 million threshold.

When to Talk to a Professional

An attorney can advise on whether an LLC or corporation fits your plans, how to draft your operating agreement, and how to structure ownership with partners. A CPA can help with the CAT, the state income tax on business profit, and municipal net profit tax. An insurance agent who writes contractor policies can confirm your coverage meets the OCILB requirement. Bring this checklist to each meeting so you do not pay for questions you can answer yourself.

Disclaimer

This article is informational content only. It is not legal, tax, or licensing advice, and it does not create an attorney-client or accountant-client relationship. Fees, deadlines, and statutes change, and the OCILB licensing status described here may change after this article was written. Verify every figure with the Ohio Department of Commerce, the Ohio Secretary of State, the Ohio Department of Taxation, the Bureau of Workers' Compensation, and the EPA before you act on it.