New Hampshire Heat Pump and Mini Split Permit Requirements

Do You Need a Permit for a Heat Pump in New Hampshire?

The short answer depends entirely on what fuels the system and where the property sits. New Hampshire does not issue a standalone heat pump license or a general HVAC license at the state level. Instead, the Office of Professional Licensure and Certification (OPLC) regulates mechanical trades by the specific fuel source or technical scope involved. That means a ductless mini-split running on electricity alone falls under a different regulatory path than a dual-fuel heat pump connected to a gas backup furnace.

For a purely electric heat pump or ductless mini-split, you do not need a state-issued mechanical license from the OPLC. The work is not classified as fuel gas fitting, so the Mechanical Licensing Board has no jurisdiction over it. However, you still need EPA Section 608 certification to handle the refrigerant lines, and you will almost certainly need a local electrical or mechanical permit from the municipality where the installation happens.

Nashua's Building Safety Department is a good example of this split. A ductless mini-split that does not involve gas piping requires an electrical permit, not a mechanical permit. Manchester separates permits into "Mechanical (fuel-gas)" for licensed gas fitters and "Mechanical (non-fuel gas)" for standard ductwork or purely electrical systems, each with its own fee schedule.

When Gas Changes Everything: Dual-Fuel Systems

The regulatory picture shifts once a gas line enters the equation. If you are installing a dual-fuel heat pump — an electric heat pump paired with a gas furnace as backup — you need an OPLC Fuel Gas Fitter license for the gas piping and appliance connection portion of the work. The specific license tier depends on the scope: a Fuel Gas Piping Installer license (60 classroom hours, 1,000 field hours) covers the piping itself, while a Fuel Gas Installation Technician license (100 classroom hours, 1,000 field hours) covers connecting the gas appliance.

This catches a lot of AC-only technicians off guard. You might have years of experience installing standard split systems and hold a Universal EPA 608 certification, but the moment a customer wants a hybrid system with a gas furnace, you legally cannot touch the gas side without the appropriate OPLC credential. Working without the license violates the state mechanical licensing requirements under RSA 153:27 through RSA 153:38, and municipalities can issue stop-work orders for unlicensed work or missing permits.

If you are an AC specialist facing this exact situation, the Fuel Gas Piping Installer specialty license has the lowest education and experience thresholds of the gas credentials in the state.

Municipal Permit Fees and Process

Regardless of state licensing, every heat pump or mini-split installation in a municipality with a code enforcement office requires a local permit before work begins. The fees vary significantly by city:

Manchester charges residential mechanical permits on a flat per-unit basis — $40 for a single dwelling unit, $50 for two units. Commercial installations are charged by heating capacity: $75 minimum for systems up to 100,000 BTUs, plus $0.20 per additional 1,000 BTUs above that threshold.

Nashua layers a $50 base application and review fee on top of equipment surcharges. A ductless split unit adds $40 per indoor head. If the system involves gas piping, a separate delivery system fee is calculated at $0.30 per 1,000 BTUs.

In unincorporated areas or towns without a local code enforcement officer, the authority shifts to the State Fire Marshal's Office. You submit a job notification through the MyGov portal, and the state's building permit fee is 1.2% of the first $100,000 of contracted construction cost.

Every installation — whether gas-connected or electric-only — must pass a final inspection before the system can be permanently commissioned. Closing up walls or concealing ductwork before the rough-in inspection can result in the inspector requiring you to open walls to expose previously concealed work for review.

The Lead-Safe Layer for Pre-1978 Buildings

One requirement that trips up heat pump installers working in older homes: Manchester requires a Lead-Safe Certification before issuing a Certificate of Occupancy for new dwelling units in buildings constructed before 1978. Ask the building department whether your project must document EPA RRP (Renovation, Repair, and Painting) compliance as part of its permit or inspection process.

Getting Licensed Before Your First Heat Pump Job

If you are an electrician or AC tech who needs to add gas credentials to legally handle dual-fuel systems, the full regulatory pathway includes the examination-first rule (you must pass the state exam before submitting your license application to the OPLC), supervised field hours documented on a sworn affidavit, and the business entity license if you plan to operate under an LLC or corporation name.

The New Hampshire HVAC License Guide walks through every step of the OPLC licensing ladder — from trainee registration through business entity formation — so you can map the exact credential sequence for your situation before paying any fees or signing up for classes.

See more New Hampshire guides →