Delaware HVAC License Types — Unrestricted Master vs. Restricted Specialties

Two Tiers, Very Different Scopes

Delaware issues two tiers of HVAC trade credentials through the Division of Professional Regulation: the Master HVACR (unrestricted) and the Master HVACR Restricted. The unrestricted license covers the full range of mechanical and fuel gas piping work — heating, ventilation, air conditioning, refrigeration, and gas piping systems. The restricted license limits you to one specific specialty.

Choosing between them affects which jobs you can legally accept, which exams you sit for, and how much of the market you can serve.

The Six Restricted Specialties

A Master HVACR Restricted credential covers exactly one of these categories:

• Heating - Forced Air — furnaces, heat pumps with forced-air distribution, ductwork
• Heating - Hydronic — boilers, radiant floor systems, hydronic piping
• Commercial Hood — commercial kitchen ventilation and exhaust systems
• Refrigeration — walk-in coolers, reach-in units, process cooling
• Air Conditioning — split systems, packaged units, cooling-only installations
• Gas Piping — gas supply lines, gas appliance connections, fuel gas systems

If you hold a Restricted - Air Conditioning license, you cannot legally install a furnace or run gas piping. Taking a job outside your restricted scope is not covered by that credential; the work must fall within the authorized specialty.

How This Affects the Exam

The unrestricted Master HVACR exam through ProV covers all mechanical disciplines in a single 100-question, four-hour test. Restricted candidates take an exam focused on their specialty.

For the Apprenticeship By-Pass Exam (the ABC Delaware test for candidates without a journeyman certificate), a March 2025 regulatory update changed the rules: restricted applicants now only need to pass the bypass exam section relevant to their specialty, rather than the full bypass exam. This is a meaningful reduction in testing burden for candidates pursuing a single-specialty credential.

Career and Business Implications

The restricted license is faster to obtain if your experience is concentrated in one area, but it caps your revenue potential. A residential HVAC contractor who holds only the Air Conditioning restriction cannot take heating calls in winter — the busiest and highest-margin season in the mid-Atlantic market.

Most contractors who plan to operate independently choose the unrestricted path. The additional exam scope is manageable (the test is open-book with the International Mechanical Code and International Fuel Gas Code as permitted references), and the unrestricted credential eliminates scope-of-work questions on every job estimate.

To move from a restricted credential toward unrestricted scope, contact the Board for the current upgrade requirements; do not assume that sitting for the full exam alone automatically upgrades the license.

The Journeyman Question

Delaware does not issue a standalone journeyman HVAC license as a working credential. The journeyman certificate is a training milestone — proof that you completed an approved apprenticeship program — that qualifies you for the Pathway A route to the Master exam (two years of post-apprenticeship experience instead of seven years total). You cannot pull permits or operate independently with a journeyman certificate alone. The Master or Master Restricted license is the minimum credential for independent work.

The Delaware HVAC License Guide breaks down both pathways — apprenticeship completer and bypass route — for each license type, with the specific exam sections, experience requirements, and Board review timelines you need to plan around.

See more Delaware guides →