How to Start an HVAC Business in Minnesota: No State License, a $25,000 Bond and Local Rules

If you have searched for a minnesota hvac license, you have probably read guides that say you need a state credential before you can bid a furnace replacement or a rooftop unit. For mechanical contracting work in Minnesota, that is not how the system works. The state does not issue a state license for mechanical contractors or HVAC technicians. What it does require is a $25,000 mechanical contractor bond filed with the Department of Labor and Industry (DLI). Beyond that, your real licensing burden is local, and it varies by city and county.

This guide walks through the steps in the order most owners need them, using the fees and deadlines we could verify as of 2026.

This article is informational content, not legal or tax advice. Licensing, bonding and tax rules change, and your situation may call for a licensed attorney or CPA. Confirm every figure with the agency named before you pay or file.

What You Need Before You Start

Gather these items before you file anything. Most delays come from missing one of them partway through the process.

• A proposed business name that you have checked against Minnesota Secretary of State records
• A choice of entity, usually a limited liability company (LLC) for a small HVAC shop
• A registered office, which must be a Minnesota street address. A PO box by itself will not be accepted.
• A surety company that is licensed in Minnesota and will issue the mechanical contractor bond
• The DLI mechanical contractor bond form, which you should download from the DLI website
• Filing money for the Secretary of State: $155 online or in person, or $135 by mail for Articles of Organization
• A federal employer identification number (EIN) from the IRS
• A Minnesota Tax ID and a Sales and Use Tax account from the Department of Revenue
• A written list of every city and county where you plan to work, with the contact for each licensing office

Step-by-Step: Forming and Licensing Your HVAC Business

1. Confirm that you do not need a state HVAC license

Minnesota has no general statewide business license. Licenses are issued by trade or activity, and the state's central lookup is License Minnesota at mn.gov/elicense, where you can browse requirements by topic, agency or an A to Z index. Searching there for a mechanical or HVAC license will not turn up a state credential for technicians or contractors, because the state does not issue one for this work.

The requirement that does apply is the $25,000 mechanical contractor bond. Under Minnesota rules, that bond is required to contract gas, heating, ventilation, cooling, air conditioning, fuel-burning or refrigeration work. Before you spend money on other credentials, read the DLI mechanical contractor pages and confirm that you understand what the bond covers.

Some guides online say a state HVAC license is required. That is not correct for Minnesota as of 2026. If you find a course or vendor selling a "Minnesota state HVAC license," ask them to show you the statute or DLI page that creates it.

2. Choose your entity and file with the Secretary of State

Most owners form an LLC. The formation document is Articles of Organization under Minnesota Statutes, Chapter 322C. Filing costs $155 online or in person, which is the expedited option, and $135 by mail, which is not expedited. The Secretary of State does not publish a guaranteed turnaround in business days, so if you have a start date tied to a bond or a city permit, file early.

Your LLC name must contain the words "limited liability company" or the abbreviation "LLC." It may not contain "corporation" or "incorporated," or their abbreviations. It also has to be distinguishable on state records from every domestic LLC, LLP, corporation and limited partnership already on file, authorized, registered or reserved in Minnesota. Search the Secretary of State database at mblsportal.sos.mn.gov/Business/Search before you settle on a name.

If you need time to finish the bond or city paperwork, you can reserve a name for 12 months for $55. The reservation renews in additional 12 month periods. Forms are at the Secretary of State name reservation PDF.

Formation is a filing, not a license. Filing Articles of Organization does not authorize you to perform HVAC work. Do not describe it that way on invoices or in marketing.

A corporation is also possible, under Chapter 302A, with the same $155 filing fee. The corporation franchise tax is 9.8 percent for C corporations, so most small HVAC owners compare that against the pass-through treatment of an LLC before choosing.

3. Understand how your entity is taxed

An LLC taxed as a partnership or disregarded entity passes its income through to the owners, who pay Minnesota individual income tax at graduated rates of 5.35, 6.80, 7.85 and 9.85 percent. An LLC that files federally as a C corporation pays the 9.8 percent corporation franchise tax instead. Minnesota also applies a minimum fee under Minn. Stat. 290.0922 to C corporations, S corporations and partnerships. A single member LLC that reports only on the member's individual return is exempt from that minimum fee.

This is informational only. Ask a CPA which structure fits your payroll, vehicles, equipment and expected profit before you file.

4. File the $25,000 mechanical contractor bond with DLI

The bond is the core state requirement. You need a $25,000 mechanical contractor bond on the DLI form, issued by a surety licensed in Minnesota. A bond is a promise backed by the surety, so the surety will check your business background and may ask for personal financial information before it issues the bond.

The bond filing fee is $100, the bond is valid for two years, and the renewal fee is $100. Confirm these figures on the DLI site before you pay, because bond rules and fee schedules can change. Ask the surety to confirm how the form should be signed and submitted, and whether DLI requires the bond to be on file before your first job.

Keep a copy of the filed bond with your business records. Cities and inspectors may ask to see it when they review a permit or a contractor license application.

5. Check local licensing city by city

This is where most HVAC owners get stuck. Minnesota has 87 counties, about 853 cities and about 1,780 townships. Local rules vary widely, and a mechanical contractor can be fully bonded with DLI and still be unable to pull a permit in the city next door.

Cities may require their own licenses or competency cards, often called comp cards. DLI does not issue comp cards, so a DLI bond does not replace a city credential. Minneapolis and St. Paul each license by category, and neither issues a general business license. Smaller cities, counties and townships set their own requirements, so call each office and ask three questions:

• Do you require a contractor license or a competency card for mechanical work?
• What is the application fee, and is it annual or renewable on another schedule?
• What proof of the DLI bond and insurance do you want on file?

Record the answers in a spreadsheet with the jurisdiction, requirement, fee, renewal date and contact. Update it every year. A list like this saves more time than any single form.

6. Register with the Department of Revenue before any taxable sale

Minnesota does not require a general business license, but you do need a Minnesota Tax ID and a Sales and Use Tax account before you make taxable sales. Register through the Department of Revenue's online new business registration at the Revenue new business registration page. Registration with Revenue is a tax account, not a license.

The state sales tax rate is 6.875 percent, and local taxes are added on top. Whether your service calls, parts and equipment sales are taxable, and how to charge tax on each, depends on the type of transaction. Confirm the treatment with Revenue before you send your first invoice, and keep the answers in writing. More information is at revenue.state.mn.us.

7. Treat gas piping and refrigerant handling as separate rules

The mechanical contractor bond does not settle everything. Gas piping and refrigerant handling carry separate rules. Do not assume the bond or your city license covers them. Ask DLI which gas piping rules apply to your crew, and ask the U.S. Environmental Protection Agency (EPA) what federal requirements apply to refrigerant handling, recovery and disposal. Document the answers, and make sure every technician who does this work meets the rules that apply to them.

8. Build to the Minnesota State Mechanical Code

Your installations must follow the Minnesota State Mechanical Code, which is chapter 1346. Read the chapter before you quote your first job, because code requirements affect materials, clearances, venting and combustion air. Ask the city or county building department how permits and inspections are handled in each jurisdiction where you work. Inspectors will hold you to the code in effect in their jurisdiction, so the local office is the place to check specifics.

9. Set a calendar for renewals and deadlines

Put these dates in your calendar on the day you file:

• December 31 every year: LLC annual renewal. The fee is $0 if the LLC is active and in good standing.
• Every two years: mechanical contractor bond renewal, at $100 per the current DLI schedule.
• Each city and county date: competency card and local license renewals, which vary by jurisdiction.
• Revenue filing dates: sales and use tax returns on the schedule Revenue assigns to your account.

Missing the LLC renewal has real consequences. Under Minn. Stat. 322C.0705, an LLC that fails to file by December 31 is terminated or revoked without further notice. Reinstatement costs $65 by mail or $85 online or in person under the current Secretary of State fee schedule.

Fee and Deadline Summary

Use this table as a starting point. Confirm each figure on the named agency site before you pay.

Item	Cost	Agency or source	Timing
Articles of Organization (LLC), online or in person	$155	Secretary of State	Expedited; no published guarantee
Articles of Organization (LLC), by mail	$135	Secretary of State	Not expedited
Name reservation	$55	Secretary of State	12 months, renewable
Mechanical contractor bond	$25,000 bond; $100 filing fee	DLI, through a Minnesota-licensed surety	Valid two years
Mechanical contractor bond renewal	$100	DLI	Every two years
LLC annual renewal	$0	Secretary of State	Due December 31
LLC reinstatement	$65 by mail; $85 online or in person	Secretary of State	After a missed December 31 filing
Sales tax	6.875 percent state rate, plus local tax	Department of Revenue	Before taxable sales
City or county licenses and competency cards	Set by each jurisdiction; confirm locally	City, county or township	Varies

Tips and Common Mistakes to Avoid

• Searching for a state HVAC license. The state does not issue one for mechanical contractors or technicians. Spend your time on the bond, the city requirements and the Revenue account instead.
• Assuming the DLI bond is enough to work anywhere. Many cities want their own license or comp card, and DLI does not issue those.
• Using a PO box as your registered office. The registered office must be a Minnesota street address. Your principal place of business can be somewhere else.
• Naming the LLC without "LLC" or with "Corporation." The name rules are strict, and the Secretary of State will not accept a name that breaks them.
• Filing an assumed name without publishing it. A DBA is filed with the Secretary of State for $50 online or in person, or $30 by mail. It must then be published for two consecutive issues in a qualified legal newspaper in the county of your principal place of business. Failure to publish may make the certificate invalid. The certificate must be renewed annually at no charge. Forms are at the Secretary of State assumed name page. An LLC or corporation needs no publication.
• Invoicing before your Revenue account is open. Register first, then send taxable invoices.
• Forgetting the December 31 LLC renewal. The annual renewal is free, but a missed filing ends the LLC and triggers reinstatement fees.
• Treating gas and refrigerant work as covered by default. Ask DLI and EPA which rules apply to each crew member and each type of job.
• Letting the bond or license lapse. Put the two-year bond date and every city renewal date in a shared calendar, and assign one person to own it.

What Results to Expect

If you complete the steps above, you should have a formed entity, a bond on file with DLI, a Revenue account for sales tax, and the local licenses for the cities you plan to serve. Check with DLI, your surety and each local licensing office for current timing, because this guide does not state processing times.

Results will depend on your market, your crew, your insurance, your local competition and your own work quality. Nothing in this guide promises a particular number of jobs, revenue or timeline. Treat the steps as a checklist for getting the legal foundation in place, then build the business from there.

Resources and Where to Confirm Each Figure

• Minnesota Secretary of State: sos.mn.gov, including business filings and the business search
• Minnesota Department of Revenue: revenue.state.mn.us, for tax registration and sales tax questions
• License Minnesota: mn.gov/elicense, to browse licenses by topic, agency or A to Z index
• Minnesota Small Business Development Center Network, administered by DEED: mn.gov/deed/business/help/sbdc, for business planning advice
• U.S. Small Business Administration, Minnesota district: sba.gov/district/minnesota
• Department of Labor and Industry (DLI): the mechanical contractor bond form and rules, on the DLI website. Confirm current fees and gas piping requirements with DLI directly.
• U.S. Environmental Protection Agency: refrigerant handling requirements, confirmed directly with EPA

When to Bring in a Professional

Talk to a Minnesota business attorney before you choose between an LLC and a corporation, sign a contract with a partner, or take on investors. Ask a CPA how your entity choice affects your individual income tax, the minimum fee and your payroll obligations. A surety agent can explain bond underwriting, and a local building official can tell you exactly what each city expects. Those conversations cost less than fixing a licensing gap after your first job.

Reminder: this article is informational content, not legal or tax advice. Verify every fee, deadline and requirement with the agency that administers it before you act.