Wisconsin HVAC license requirements and insurance

To work for yourself as an HVAC contractor in Wisconsin, you need the HVAC Contractor (business registration) license. Wisconsin has 2 HVAC license types, and which one you need depends on the work you take on. The state sets no minimum liability insurance, and workers' comp is required from the first employee. The state does not ask for a bond.

Who it applies to

1Who needs a heating and air conditioning license in Wisconsin? What is this?

HVAC Contractor (business registration): any person, entity or business that installs or services heating, ventilating or air conditioning equipment for others.

License	Who needs it	What it covers
HVAC Contractor (business registration)	Any person, entity or business that installs or services heating, ventilating or air conditioning equipment for others.	Lets a business take on HVAC installation and service jobs. The applicant must be the business owner, a partner, or the chair or CEO of the corporation.
HVAC Qualifier (individual certification)	The individual whose certification lets a business be treated as a certified HVAC business, and who may then skip separate local HVAC certification or approval.	Qualifies a business for HVAC installation and servicing work statewide.

License

Who needs it

What it covers

HVAC Contractor (business registration)

Any person, entity or business that installs or services heating, ventilating or air conditioning equipment for others.

Lets a business take on HVAC installation and service jobs. The applicant must be the business owner, a partner, or the chair or CEO of the corporation.

HVAC Qualifier (individual certification)

The individual whose certification lets a business be treated as a certified HVAC business, and who may then skip separate local HVAC certification or approval.

Qualifies a business for HVAC installation and servicing work statewide.

Who runs it

2Who issues HVAC contractor licenses in Wisconsin? What is this?

Wisconsin Department of Safety and Professional Services (DSPS) issues HVAC licenses in Wisconsin.

See how this compares in every state: How to check a contractor's license, state by state

Name	Wisconsin Department of Safety and Professional Services (DSPS)
Website	dsps.wi.gov
Look up a license	license.wi.gov
The law	Wis. Stat. § 101.178
The rulebook	Wis. Admin. Code § SPS 305.70 and § SPS 305.71

Checked by a person against the official page·dsps.wi.gov

Getting licensed

3How to become an HVAC contractor in Wisconsin What is this?

Wisconsin has 2 licenses that matter to an HVAC contractor: HVAC Contractor (business registration), HVAC Qualifier (individual certification). Each is below, with what you need before you apply.

License	Experience required	Exam
HVAC Contractor (business registration)	—	—
HVAC Qualifier (individual certification)	At least 1,000 hours a year for 4 years supervising or performing HVAC design, installation, servicing or maintenance, or 4 years in a mechanical engineering or related HVAC program, or a mix of both.	The HVAC Qualifier certification exam.

License

Experience required

Exam

HVAC Contractor (business registration)

—

HVAC Qualifier (individual certification)

At least 1,000 hours a year for 4 years supervising or performing HVAC design, installation, servicing or maintenance, or 4 years in a mechanical engineering or related HVAC program, or a mix of both.

The HVAC Qualifier certification exam.

What it costs

4How much does an HVAC license cost in Wisconsin? What is this?

The government fees on this page add up to about $220 in Wisconsin. Add insurance, tools, and a vehicle to get the real number.

License	Renewal
HVAC Contractor (business registration)	$160
HVAC Qualifier (individual certification)	$60

License

Renewal

HVAC Contractor (business registration)

$160

HVAC Qualifier (individual certification)

$60

Added up

Government fees, added up	$220

Adds the 2024 renewal-table figures for HVAC Contractor ($160) and HVAC Qualifier ($60), since initial application and exam fees are not published outside the LicensE portal. Leaves out the EPA 608 card, insurance and tools.

Our estimate

Insurance

5How much HVAC insurance do you need in Wisconsin? What is this?

Wisconsin sets no minimum liability insurance for this license. Customers and general contractors usually ask for $1,000,000 anyway. Workers' comp is required from the first employee.

Minimum liability insurance	None required by the state
Type of policy	None found.
How we know	Wis. Admin. Code §§ SPS 305.70 and 305.71, read in full on 2026-09-21, list the HVAC Contractor and HVAC Qualifier requirements and their exemptions, with no insurance or bond duty in either.
Workers' comp required?	Yes
Who can opt out	An employer with fewer than 3 employees need not carry coverage. That changes once it pays $500 or more in combined wages in any calendar quarter. Then coverage is due by the 10th day of the next quarter's first month.
Workers' comp: if you skip it	Wisconsin does not publish the amounts. Ask the Department of Workforce Development what applies to you.

Checked by software against the official page

·2 official pages

Money checks

6Does Wisconsin check your credit for an HVAC contractor license? What is this?

Wisconsin does not check your credit for this license.

Credit score you need	None found.
How we know	The HVAC Contractor and HVAC Qualifier application pages, read in full on 2026-09-21, set no credit or financial test.

Checked by a person against the official page·dsps.wi.gov

Bonds

7Does an HVAC contractor need a bond in Wisconsin? What is this?

Wisconsin does not require a state bond for this license. Some cities ask for one before they issue permits.

Does the state require a bond?	No
Amount	Not listed yet

No bond requirement found for either HVAC credential.

Checked by a person against the official page·dsps.wi.gov

Federal rules

8Federal rules that also apply What is this?

Rules from the US government that apply to an HVAC contractor in Wisconsin on top of the state's own.

EPA refrigerant certification	Anyone who opens a refrigerant circuit needs the EPA Section 608 card. It never expires.

Checked by a person against the official page·epa.gov

Showing your number

9Where must a Wisconsin HVAC contractor show the license number? What is this?

In Wisconsin: no display or advertising rule was found in the HVAC Contractor or HVAC Qualifier rule sections read for this record.

The rule	No display or advertising rule was found in the HVAC Contractor or HVAC Qualifier rule sections read for this record.

Checked by software against the official page·dsps.wi.gov

Tax

10Does an HVAC contractor charge sales tax on labor in Wisconsin? What is this?

In Wisconsin, not taxed when the work is a real property construction activity, such as installing a furnace or air conditioner into a building. Materials the contractor buys and installs are taxed to the contractor, not the customer. The rest of the rules are below.

See how this compares in every state: Can you charge sales tax on labor? The rule in 25 states

Tax rate	5% state rate. Some counties add a 0.5% county tax, and some add a 0.1% stadium tax, so the total can run from 5% to 5.6% depending on the county.
Labor	Not taxed when the work is a real property construction activity, such as installing a furnace or air conditioner into a building. Materials the contractor buys and installs are taxed to the contractor, not the customer.
Who pays tax on materials	The HVAC contractor pays tax on materials, as their consumer. The exception is a portable or window unit, which counts as personal property. Then the customer pays tax on the whole bill instead.
The exception that catches people out	Selling and installing a furnace is a real property job, so materials tax falls on the contractor. Repairing or servicing equipment that keeps its character as personal property is different. That is a taxable retail sale, with tax on labor and parts both.

Checked by a person against the official page·revenue.wi.gov

Getting paid

11Getting paid: lien and notice deadlines for a Wisconsin HVAC contractor What is this?

If you are not paid in Wisconsin, a lien on the property is your backstop, but only if your notice goes out on time: contractor hired by the owner, with no written contract: within 10 days of first work or materials. Subcontractor or supplier: within 60 days of first work or materials.

The order things have to happen in, counted in days

Day 0
Your first day on the job
The clock starts here.
Day 10
Send your notice
Contractor hired by the owner, with no written contract: within 10 days of first work or materials. Subcontractor or supplier: within 60 days of first work or materials.
Day 30
File your lien
Within 6 months of the last work or materials, filed with the clerk of circuit court in the county where the property is. At least 30 days before filing, a written notice of intent to file must be served on the owner. A copy of the filed claim must be served on the owner within 30 days after filing.

Each day count is counted from the day the rule beside it names, which is not always the same day. Read the sentence under each one.

Who has to send a notice	A contractor hired directly by the owner who uses subcontractors or suppliers must give the owner the state's lien notice. It goes in the written contract, or is handed over separately if there is none. A subcontractor or supplier must send the owner a written notice, in 2 signed copies. Neither notice is needed on a job that adds more than 4 homes, on any job that is partly or wholly nonresidential, or from a worker employed by a contractor.
Send your notice by	Contractor hired by the owner, with no written contract: within 10 days of first work or materials. Subcontractor or supplier: within 60 days of first work or materials.
File your lien by	Within 6 months of the last work or materials, filed with the clerk of circuit court in the county where the property is. At least 30 days before filing, a written notice of intent to file must be served on the owner. A copy of the filed claim must be served on the owner within 30 days after filing.
File a lawsuit by	Within 2 years of filing the claim.

Checked by software against the official page

·2 official pages

Keeping it

12How do you renew an HVAC license in Wisconsin? What is this?

The HVAC Contractor (business registration) renews every 4 years, from date of issuance.

License	Renewal
HVAC Contractor (business registration)	Every 4 years, from date of issuance.
HVAC Qualifier (individual certification)	Every 4 years, from date of issuance.

License

Renewal

HVAC Contractor (business registration)

Every 4 years, from date of issuance.

HVAC Qualifier (individual certification)

Every 4 years, from date of issuance.

Renewal fees are in what the license costs. The official page for each license is linked under how you get it.

Watch out

13What catches people out in Wisconsin What is this?

The things people get wrong or do not expect about Wisconsin, in a few sentences.

Wisconsin has no individual journeyman or master HVAC license. Instead a business registers as an HVAC Contractor, and one HVAC Qualifier's certification lets that whole business work statewide.
Once a business has a certified HVAC Qualifier, state law says it may not be made to get a separate local HVAC certification, license or approval anywhere in Wisconsin.
No HVAC registration is needed to service equipment a business already owns, or to install or service HVAC or refrigeration equipment in a dwelling the business owner lives in.
Electrical and plumbing work tied to an HVAC job stays outside the HVAC Contractor registration and needs its own separate DSPS license.

Checked by a person against the official page

·2 official pages

14Where these numbers come from

The labels under each table are explained on how to read a page.