Blog

All articles about New Hampshire HVAC License Guide.

How to Start an HVAC Business in New Hampshire

From personal gas fitter license to OPLC business entity — LLC formation, Secretary of State filing, insurance mandates, and the workers' comp trap for NH HVAC contractors.

EPA 608 Certification in New Hampshire

EPA Section 608 certification is a federal requirement for handling refrigerants in NH. Learn what it covers, the four types, and how it fits with state licensing.

New Hampshire Gas Fitter License

Complete guide to NH gas fitter license tiers — Trainee, Piping Installer, Installation Technician, and Service Technician. Hours, exams, fees, and application steps.

New Hampshire HVAC Contractor Bond

When NH HVAC contractors need performance bonds, the dollar thresholds for public vs. municipal projects, and how bonding differs from general liability insurance.

New Hampshire HVAC License Fees

Every OPLC mechanical licensing fee in one place — trainee through business entity — including the 2026 Plc 1002.25 updates and the sole-licensee exemption.

New Hampshire HVAC License Reciprocity and HB 594

How to transfer an out-of-state HVAC license to New Hampshire under House Bill 594's universal license recognition — eligibility, process, and the 'substantially similar' standard.

New Hampshire HVAC License Requirements

New Hampshire has no general HVAC license. Learn what credentials the OPLC Mechanical Licensing Board actually requires for heating, cooling, and gas work in NH.

New Hampshire HVAC LLC Formation

Step-by-step LLC formation for NH HVAC contractors — SOS filing, OPLC business entity license, EIN, and the workers' comp trap that catches single-member LLCs.

New Hampshire HVAC Permit Requirements

Municipal HVAC permit process in NH — Manchester and Nashua fee breakdowns, the state vs. local jurisdiction split, and permits in unincorporated towns.

New Hampshire Mechanical Inspection

Who inspects HVAC installations in NH — local building departments vs. the State Fire Marshal — and what happens in towns without a code enforcement officer.

New Hampshire Plumber License

Complete requirements for NH plumber licensing — apprentice through master — including hours, exams, fees, and how plumbing credentials intersect with HVAC work.

New Hampshire Refrigeration License

New Hampshire doesn't issue a state refrigeration or AC license. Here's what you actually need — EPA 608, local permits, and when gas fitter credentials come into play.