The North Carolina Heating Group 3 Class I Contractor License represents one of the most comprehensive HVAC contractor classifications in the state. This license allows contractors to perform residential and commercial heating system installations within Class I limitations, requiring mastery of mechanical code, fuel gas systems, load calculations, duct design, refrigeration theory, and state licensing laws.
This complete book package includes the required references for the trade portion of the Heating Group 3 Class I Contractor examination.
North Carolina Administration Code and Policies, 2018 Edition
North Carolina Fuel Gas Code, 2018 Edition
North Carolina Mechanical Code, 2018 Edition
North Carolina Energy Conservation Code, 2018 Edition
North Carolina Residential Code, 2018 Edition
NC Boardβs Laws & Rules β 2026 Edition
Manual J β Residential Load Calculations (2016 Reprint, 8th Full Edition)
Manual N β Commercial Load Calculation for Small Commercial Buildings, 5th Edition
Manual Q β Commercial Low Pressure, Low Velocity Duct System Design (1990)
Manual D β Residential Duct Systems (2016, 3rd Edition)
Modern Refrigeration and Air Conditioning, 22nd Edition
Ductulator
The Heating Group 3 Class I Contractor trade exam tests your ability to:
β Perform residential and light commercial load calculations
β Design and size duct systems correctly
β Apply refrigeration principles and system troubleshooting knowledge
β Interpret mechanical, fuel gas, energy, and residential code requirements
β Navigate North Carolina administrative rules and licensing regulations
This is a calculation-intensive, code-driven exam that requires strong navigation skills and deep understanding of HVAC system design.
To prepare for the Business & Law portion of the North Carolina contractor exam, you must obtain:
Business & Project Management for Contractors (6th or 7th Edition)
π This book is NOT included in this package.
π It can only be obtained by directly contacting the North Carolina State Licensing Board.
This reference is mandatory for the Business & Law examination and must be secured separately.
Technicians upgrading to Class I Contractor status
HVAC professionals expanding into broader residential and commercial work
Contractors seeking higher project limitations under Group 3
Candidates preparing to pass both trade and business exams on the first attempt
The exam is open book β but success depends on how efficiently you can navigate manuals, formulas, duct sizing charts, and North Carolina code sections.
With this package, youβll have:
The required North Carolina code books
Essential ACCA load calculation and duct design manuals
A comprehensive refrigeration reference
The tools needed to confidently approach technical and calculation-based exam questions
Make sure youβre studying from the correct editions required for testing and walk into your Heating Group 3 Class I Contractor exam fully prepared.