New Hampshire HVAC License Requirements

If you search for a "New Hampshire HVAC license," you will not find one — because it does not exist as a single credential. New Hampshire regulates the mechanical trades through the Office of Professional Licensure and Certification (OPLC) Mechanical Licensing Board, and the system is split by the type of work you do, not by a catch-all "HVAC" category.

That distinction trips up technicians relocating from states that issue a single HVAC license. Understanding which credentials you actually need — and which ones you can skip — is the first step toward working legally in the Granite State.

How New Hampshire Structures Mechanical Licensing

The OPLC Mechanical Licensing Board operates under RSA 153:27 through RSA 153:38. Instead of issuing a broad HVAC license, it regulates specific trade classifications based on the fuel source and scope of work:

• Fuel Gas Fitter licenses (Trainee, Piping Installer, Installation Technician, Service Technician) — required for anyone installing, servicing, or repairing natural gas or LPG piping, appliances, or venting systems under Amilia's Law
• Hearth System Installation and Service — a specialty license for gas fireplaces and venting
• Oil Heating Technician Certification — voluntary at the state level but practically required for municipal permits and utility programs
• Plumbing licenses (Apprentice, Journeyman, Master) — intersect with HVAC through hydronic heating systems
• Domestic Appliance Technician — for residential gas appliance connections

The critical threshold is fuel gas. If your work touches natural gas or propane in any way — piping, appliances, venting — you need the corresponding Fuel Gas Fitter license from the OPLC. Work that stays entirely within air conditioning, refrigeration, or electric heat pump systems does not require a state mechanical license, though you still need EPA Section 608 certification for refrigerant handling and local municipal permits.

What You Need Based on Your Specialization

The fastest way to identify your licensing path is to ask one question: does the work involve fuel gas?

AC and refrigeration only (no gas lines): You need EPA Section 608 certification (a federal requirement) plus local municipal permits. No state-level mechanical license required. Many technicians in this category register as a Sole Proprietor or LLC with the Secretary of State for liability protection but face no OPLC licensing obligation.

Gas piping installation: You need the Fuel Gas Piping Installer (GPI) specialty license — 60 hours of classroom training, 1,000 hours of verified field experience, and a passing state exam score.

Gas appliance installation and service: You need either the Fuel Gas Installation Technician license (100 classroom hours, 1,000 field hours) or the Fuel Gas Service Technician license (140 classroom hours, 2,000 field hours), depending on whether your scope includes diagnostics and repair.

Multi-system work (gas + cooling + oil): You may need multiple credentials stacked together — a Fuel Gas Service Technician license for gas work, EPA 608 for refrigerants, and possibly the voluntary Oil Heating Technician Certification for oil-fired equipment.

The OPLC Mechanical Licensing Board

The Mechanical Licensing Board moved from the Department of Safety to the OPLC, and older rule references carrying the "Saf-Mec" prefix are being recodified under the "Mec" title (Mec 100 through Mec 800). Use the current Mec rules when checking where to submit applications and how fees and technical requirements apply.

The board handles all individual and business entity licensing for gas fitters, plumbers, and domestic appliance technicians. It also oversees continuing education compliance through the CE Broker platform (mandatory since February 2025) and administers the out-of-state endorsement pathway under HB 594.

Contact the OPLC directly when you need to verify out-of-state hour equivalency, check education provider approval status, or resolve CE Broker sync issues with your licensing record.

State License vs. Municipal Permits

A common and expensive misunderstanding: holding an OPLC license does not authorize you to start physical work on a job site. State licensing certifies your professional competency. Municipal building departments separately control project-level permitting, inspections, and code compliance.

Before starting any installation, replacement, or modification, you must file the applicable mechanical or electrical permit application with the local building department. In unincorporated areas or towns without a local code enforcement officer, the authority shifts to the State Fire Marshal's Office via the MyGov portal.

Performing work without the local permit can trigger municipal stop-work orders, OPLC administrative fines under RSA 310:12, and potential suspension of your individual and business licenses.

What About Contractors Who Only Do Electric Heat Pumps?

This is the fastest-growing segment in New Hampshire — technicians who install ductless mini-splits and air-source heat pumps with no gas connection. At the state level, this work does not require a mechanical license from the OPLC as long as no fuel gas lines are involved.

You still need EPA 608 certification for refrigerant handling, a local electrical or mechanical permit depending on the municipality, and — if your customer later wants to add a gas backup — a licensed gas fitter to handle that portion of the installation.

The practical risk for AC-only contractors is market pressure. As dual-fuel and hybrid heat pump systems become standard, customers increasingly expect their installer to handle the gas line integration. Adding a Fuel Gas Piping Installer license (the lightest gas credential at 60 classroom hours) lets you handle the gas-piping portion; choose the Installation Technician or Service Technician credential if you also need appliance installation or service.

Getting Started

For a new Fuel Gas Fitter applicant, the sequence is consistent: register as a Trainee under a licensed fitter, complete the required education and field hours, pass the state exam through an approved provider, then submit the application to the OPLC with the exam certificate, experience affidavit, and licensing fee ($190 for individual gas fitter credentials). Other paths, such as AC-only work or out-of-state endorsement, use different requirements.

After securing personal licensure, contractors who want to operate under a business name need a separate Mechanical Business Entity license from the OPLC — a step that many technicians discover only after a permit application gets rejected because they applied under a personal name instead of a registered entity.

Our New Hampshire HVAC License Guide maps the entire sequence from trainee registration through business entity setup, with the specific forms, fees, and filing order for each licensing tier. It covers the exact step where most applications stall — the examination-first rule that catches technicians who submit paperwork before passing their exam — and includes municipal permit breakdowns for Manchester and Nashua.

See more New Hampshire guides →