HVAC in Missouri

How Missouri licenses HVAC work

There is no statewide HVAC contractor license that we could find; cities or counties license HVAC work.

Local rules: The Missouri Division of Professional Registration's list of boards includes electrical contractors but shows no HVAC, heating, air conditioning, refrigeration or plumbing board, so we could not find a statewide HVAC contractor license. The City of St. Louis licenses mechanical contractors and pipefitters through its Building Division's Mechanical Contractors Board of Examiners (City Code sections 25.10.030-25.10.070), and the city says mechanical permits are issued only to licensed mechanical contractors certified by the City of St. Louis; We could not read the license classes, exam or bond details, and the city page we read has no license search link (phone 314-622-3313). We could not open the Kansas City, Missouri or St. Louis County licensing pages (access was blocked), so we could not confirm local HVAC license rules there or elsewhere in Missouri.

Ask the contractor for the mechanical or HVAC license issued by your city or county (in the City of St. Louis, a Mechanical Contractor's license from the Building Division) and confirm it with that building department, and check that a mechanical permit is pulled.

Federal rule: in every state, technicians who handle refrigerant must hold EPA Section 608 certification, whatever the state or city requires.

We could not confirm every detail from Missouri’s own sources, so treat this as a starting point and check with the agency.

Sources: pr.mo.gov, stlouis-mo.gov, stlouis-mo.gov, stlouis-mo.gov. Checked October 2026 from official sources. This is not legal advice.

Before you hire

Ask for the license number and check it on the official lookup where one exists. Ask for proof of insurance and a written, itemized estimate, and ask who pulls the permit if the job needs one – a new furnace, heat pump or air conditioner usually does.

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