HVAC Contractors in Missouri

What Missouri changes about hiring an HVAC contractor

The Missouri Division of Professional Registration publishes the list of professional boards it administers. Electrical contractors appear on it. Plumbing, heating, mechanical and general contracting do not. The one trade-licensing chapter in this area, RSMo 341, is titled Plumbers and Plumbing and deals with plumbing and drainlaying only. There is no state mechanical analogue.

Licensing therefore lives at county and city level, and it varies. St. Louis County, for example, runs mechanical licensing under its Mechanical Code and issues a license class named specifically for HVAC servicer-installer contractors, with a bond required before a mechanical permit is issued. Other Missouri jurisdictions have their own arrangements, and some have none.

For a homeowner this changes the question. In a state with a single register you check a number against a website. In Missouri you have to establish which jurisdiction governs your address, then check with that office. It is a real step, not a formality, because in the absence of a state license the local one is the only credential with any enforcement behind it.

Two credentials fill part of the gap and are worth asking about: EPA Section 608 certification, which is federal and required for anyone handling refrigerant, and NATE certification, which is voluntary and industry-run.

How to choose an HVAC contractor in Missouri

Without a state register, insurance and local licensing carry the weight. Both are verifiable by third parties rather than by the contractor telling you about them.

• Ask which Missouri county or city issued the license and for the number, then verify it with that office rather than with the contractor.
• Treat any claim of a Missouri state HVAC license as a reason to slow down. There isn’t one.
• Ask for the EPA Section 608 certification of whoever will handle refrigerant. That requirement is federal and applies everywhere.
• Get the certificate of general liability insurance direct from the insurer or agent, and confirm workers compensation if they have employees.
• Ask whether a mechanical permit is required at your address and who is pulling it.
• Ask for a load calculation rather than sizing matched to the old unit, given Missouri’s wide seasonal swing.
• Get the equipment warranty registered in your name and confirm the labor warranty separately, in writing.

Questions to ask before you sign

• Which county or city licenses you for mechanical work, and what is the number?
• Are you licensed in the jurisdiction where my property sits?
• Who on your crew holds EPA Section 608 certification?
• Is a mechanical permit required here, and are you pulling it?
• Did you run a load calculation for this house?
• What is the labor warranty, separately from the manufacturer’s?

General information, not legal advice. Local licensing in Missouri differs from one jurisdiction to the next and changes over time, so confirm current requirements with the building or licensing office covering the address where the work will be done.