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ArticleFree HVAC Contractor Practice Test by State 2026: 3,400+ Questions24 min read

Exam Review

Key Facts: NC HVAC Exam

70%

Passing Score (Both Exams)

21 NCAC 50 .0305 / 21 NCAC 60 .0213

4,000 hrs

Experience Required

NC Board

H1/H2/H3

Heating License Groups

NC Board

Annual

License Renewal

Expires Dec 31

115 Q

Practice Questions Available

OpenExamPrep

Sample NC HVAC Practice Questions

Try these sample questions to review concepts for the NC HVAC exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 115+ question experience with AI tutoring.

1Which two North Carolina state boards regulate HVAC contractor licensing?

A.Board of Electrical Contractors and Board of Plumbing

B.State Board of Examiners of Plumbing, Heating, and Fire Sprinkler Contractors (for heating/cooling) and State Board of Refrigeration Contractors (for refrigeration)

C.Department of Commerce and Department of Labor

D.Only one board regulates all HVAC work

Explanation: North Carolina uses two separate boards: the State Board of Examiners of Plumbing, Heating, and Fire Sprinkler Contractors issues heating and cooling licenses (H1, H2, H3), while the State Board of Refrigeration Contractors issues refrigeration contractor licenses (Class I commercial, II industrial, III service, IV transport).

2What are the three heating license groups in North Carolina?

A.H1: residential only, H2: commercial only, H3: industrial only

B.H1: water-based heating in any building, H2: forced air over 15 tons, H3: forced air 15 tons or less

C.H1: gas only, H2: oil only, H3: electric only

D.H1: installation, H2: repair, H3: maintenance

Explanation: North Carolina categorizes heating licenses as: H1 (water-based heating systems in any building), H2 (forced air heating and cooling units over 15 tons), and H3 (forced air heating and cooling units 15 tons or less).

3What is the experience requirement for a North Carolina heating contractor license?

A.2,000 hours

B.3,000 hours

C.4,000 hours of full-time, on-site experience

D.6,000 hours

Explanation: North Carolina requires 4,000 hours of full-time, on-site experience installing, servicing, maintaining, or repairing heating/cooling systems for the specific license group. Up to half may be substituted by academic training.

4How much of the NC 4,000-hour experience requirement can be substituted by academic training?

A.None — all hours must be on-site

B.Up to 25% (1,000 hours)

C.Up to 50% (2,000 hours)

D.All 4,000 hours can be academic

Explanation: North Carolina allows up to half (50%) of the 4,000-hour experience requirement to be substituted by academic training from an approved HVAC education program, meaning up to 2,000 hours can be credited from schooling.

5What exams must a North Carolina heating contractor pass?

A.Only a trade exam

B.A technical exam and a business and law exam

C.Three separate exams

D.No exam is required with sufficient experience

Explanation: North Carolina requires heating contractors to pass two exams: a four-hour technical exam covering HVAC knowledge, and a 90-minute business and law exam. Both require a minimum score of 70%.

6What does the North Carolina Class 1 heating license designation allow compared to Class 2?

A.Class 1 is residential only, Class 2 is commercial only

B.Class 1 allows work on all structures (residential, commercial, industrial), while Class 2 is restricted to single-family detached residential dwellings only

C.Class 1 is for new construction, Class 2 is for repairs

D.Class 1 requires more experience than Class 2

Explanation: Under G.S. 87-21, NC establishes two license classes: Class I covers plumbing, heating, and fire sprinkler systems for ALL structures, while Class II is limited to plumbing and heating systems in single-family DETACHED residential dwellings only. Class II contractors cannot work on commercial, multi-family, or attached residential buildings.

7What is the passing score for both North Carolina HVAC licensing exams?

A.60%

B.65%

C.70%

D.75%

Explanation: Both the technical exam and the business and law exam require a minimum passing score of 70% in North Carolina.

8What is the format of the North Carolina Commercial Refrigeration Contractor exam?

A.50 questions, 2 hours

B.75 questions, 3 hours

C.100 questions across four open-book parts (A: Law/Safety 15Q, B: Equipment/Theory/Electrical 40Q, C: Electrical/Mechanical Code 20Q, D: Plans/Estimating 25Q) over 6.5 hours, with law integrated into Part A — no separate business and law exam

D.150 questions, 4 hours

Explanation: The NC Commercial Refrigeration Contractor Exam is open-book with 100 questions across four parts: A (Law, Administrative Code and Safety, 15Q), B (Equipment, Equipment Performance, Theory and Electrical, 40Q), C (Electrical and Mechanical Code, 20Q), and D (Plans, Specifications and Estimating, 25Q). It is 6.5 hours total (4 hours for Parts A–C, 2.5 hours for Part D). A minimum 70% score is required on EACH part. Law is integrated into Part A — refrigeration contractors do NOT take a separate business and law exam (unlike NC heating contractors, who do).

9How often must North Carolina heating and refrigeration licenses be renewed?

A.Every 2 years

B.Annually — licenses expire on December 31

C.Every 3 years

D.Every 5 years

Explanation: Both heating and refrigeration contractor licenses in North Carolina must be renewed annually. All licenses expire on December 31 of each year, with renewal required to continue practicing.

10What is the annual renewal fee for a North Carolina HVAC (heating) license?

A.$50

B.$80

C.$150

D.$250

Explanation: The annual renewal fee for North Carolina HVAC (heating) licenses is $150. Refrigeration license renewal is $80 per year. Both expire on December 31.

About the NC HVAC Exam

North Carolina HVAC licensing requires passing a technical exam and a business and law exam, both administered by PSI. Heating licenses are H1 (steam, vapor or hot water), H2 (forced air with mechanical refrigeration capacity in excess of 15 tons) and H3 (15 tons or less); Class I covers all structures and Class II is limited to single-family detached dwellings. A separate license from the State Board of Refrigeration Contractors covers commercial refrigeration.

Exam sponsor: NC State Board of Examiners of Plumbing, Heating & Fire Sprinkler Contractors / NC State Board of Refrigeration Contractors. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Question count not published by the exam provider

Time Limit

4 hours (technical) + 1.5 hours (business & law)

Passing Score

A grade of 70 on each part

Exam / Certification Fees

$150 per examination + $150 annual license fee

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

25%

State Laws & Licensing

NC dual-board system, H1/H2/H3 classifications, Class 1/2, refrigeration board, experience, permits, and renewal

25%

Heating & Cooling Systems

Heat pumps, furnaces, boilers, refrigerant handling, charging, defrost cycles, and system diagnostics

20%

Ductwork & Air Distribution

Manual D duct design, air balancing, zoning, moisture management, crawl space considerations

15%

Mechanical Codes & Energy

NC Mechanical Code (IMC-based), NC Energy Code, blower door testing, duct leakage testing, SEER2/HSPF2

15%

Safety & Business

OSHA, EPA 608, gas safety, NC business/law exam topics, contracts, liens, and insurance

Preparing for the NC HVAC Exam

What You Need to Know

Passing score: A grade of 70 on each part
Assessment: Question count not published by the exam provider
Time limit: 4 hours (technical) + 1.5 hours (business & law)
Exam / certification fees: $150 per examination + $150 annual license fee Official sources

Using Our Practice Resources

Work through all 115 available questions
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NC HVAC: Suggested Study Strategy

1Understand the NC dual-board licensing system — know which board covers heating/cooling vs. refrigeration

2Master H1/H2/H3 license groups and Class 1/2 distinctions, especially the 15-ton threshold between H2 and H3

3Study NC-specific climate considerations: coastal humidity, mountain heating loads, and mixed-climate heat pump design

4Review the NC Energy Code requirements for duct sealing, blower door testing, and minimum equipment efficiency

Frequently Asked Questions

What heating license do I need for residential HVAC work in North Carolina?

Most residential HVAC contractors need an H3 license (forced air systems 15 tons or less). H3 Class 2 limits you to single-family homes, while H3 Class 1 allows work in any building. H2 is needed for systems over 15 tons.

How do I qualify for an NC heating contractor license?

You need 4,000 hours of on-site experience (up to half may be academic credit), must pass a 4-hour technical exam and a 90-minute business/law exam (both 70%), and pass a background check.

Does NC require separate licenses for heating and refrigeration?

Yes. Heating/cooling is licensed by the Board of Plumbing, Heating & Fire Sprinkler Contractors. Commercial refrigeration is licensed by the separate State Board of Refrigeration Contractors. Both require 4,000 hours experience.

How often must NC HVAC licenses be renewed?

Annually. All licenses expire December 31. Heating license renewal is $150/year, and refrigeration license renewal is $80/year.

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