How to start a HVAC business in Missouri (2026)
Everything a new HVAC business in Missouri needs in the first months: registration, licenses, taxes, insurance and the yearly deadlines, with official links.
1. Register your business
Most owners form an LLC with the Missouri Secretary of State. Once it's registered, find it here to claim a free website and see your exact dates.
2. Licenses
Missouri doesn't have one statewide license for HVAC contractors; it's mostly handled by cities and counties, and some trade work (like gas lines) can still need a state license. Call your city or county building department before your first job. Technicians who handle refrigerant also need federal EPA Section 608 certification.
Your city or county may also require a general business license or tax receipt.
3. Taxes
Get a free EIN from the IRS first. How. Register with Missouri before your first taxable sale. Register in Missouri
If you expect to owe $1,000 or more in federal tax for the year, you pay estimated tax four times a year.
Missouri's yearly report
Missouri doesn't require an annual report from LLCs. There's no state fee if you file on time.
Your first-month checklist
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Check your HVAC license
Missouri doesn't have one statewide license for HVAC contractors; it's mostly handled by cities and counties, and some trade work (like gas lines) can still need a state license. Call your city or county building department before your first job. Technicians who handle refrigerant also need federal EPA Section 608 certification.
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Get EPA Section 608 certified
Federal law requires it for technicians who work on equipment with refrigerant. You test once through an EPA-approved program. EPA details
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Get general liability insurance
Homeowners, landlords and general contractors ask for your certificate before you start. See options
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Get your EIN
Free from the IRS, online in about 10 minutes. Banks, clients and payroll all ask for it. You never need to pay a service for it. How to get it free
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Open a business bank account
Keeps the company's money separate from yours, which is what protects your LLC. See options
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Insure your work van
Personal auto policies usually don't cover a vehicle used for business. See options
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Payroll and workers' comp before your first hire
Most states require workers' comp once you have employees, and payroll software handles the tax filings. See options
What insurance costs
| Coverage | Median per month |
|---|---|
| General liability | $101 |
| Business owner's policy (BOP) | $139 |
| Workers' compensation | $182 |
| Commercial auto | $286 |
| Tools and equipment | $41 |
Source: Insureon, Aug 2026. Your price depends on your work, location and history.
Other trades in Missouri
Sources: state agency sites linked above; annual report rules compiled from state sites (checked Oct 2026). Rules change, so confirm with the agency before filing.