Do HVAC contractors need a license in Massachusetts?

Yes. In Massachusetts, a refrigeration technician working on refrigerant systems of 10 tons capacity or more, and a pipefitter working on heating systems rated above 700,000 BTU, must hold a state license issued under the pipefitters and refrigeration technicians law. Refrigeration licenses are limited to the size of system the holder is qualified for. Commercial duct and air exhaust work, including testing and air-balancing, requires a sheet metal worker’s license from the board of examiners of sheet metal workers. Gas piping to heating boilers and other gas appliances is gas fitting under the plumbers and gas fitters law (c. 142). This is M.G.L. c. 146, §§ 84, 81, 86; c. 112, § 238.

WhatMassachusetts
HVAC licenseState license for large refrigeration and heating systems

Source

M.G.L. c. 146, §§ 84, 81, 86; c. 112, § 238

Read the statute in the General Laws of Massachusetts (Massachusetts Legislature): malegislature.gov.

Checked against the statute on November 13, 2026.

This is a summary of a published statute, not legal advice. Rules change, local ordinances can add to them, and the terms of a specific lease may differ. Check the citation and speak to a lawyer before acting.

How Seayora uses this rule

A contractor on Seayora keeps each license with its issuing state, its expiry date and the last four digits of its number, and the business is warned before one lapses — on the website and both phone apps. A customer finding a pro on Seayora sees whether a license is on file.

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