THE 7 STEPS
H3 CLASS I · FAST TRACKRequired by federal law to legally handle refrigerants. With 6 years in the field you very likely already have this. If not, it's a quick fix — study and test online in days.
The NC Board needs proof of your field hours. Gather the following for every employer you've worked under:
• Employer name + contact info
• Start and end dates of employment
• Approximate hours worked
• Signed verification letter from each employer
You need 4,000 hours minimum. With 6+ years full-time, you have roughly 12,000+ hours — far more than required. Organized documentation is what the Board scrutinizes most.
Submit the moment your documents are ready. The Board's review takes ~6 weeks, so starting this clock immediately is the single most important scheduling move you can make. Use the entire wait period to study.
Submit to: NC State Board of Examiners of Plumbing, Heating & Fire Sprinkler Contractors
Website: nclicensing.org
Include: Completed application, experience docs, $100 fee, criminal background check (CastleBranch.com ~$25).
Don't wait idle. Start online prep immediately after submitting — this 6-week window is your study runway. Focus heavily on:
• Manual J load calculations — where most people fail
• Adjusted friction rate & duct sizing (Manual D)
• 2018 NC Mechanical, Fuel Gas, and Energy Codes
• Tabbing your codebooks (publisher-made tabs only — no homemade tabs)
Use RocketCert or AtHomePrep for structured online practice. Purchase required codebooks now so you have them to tab.
The gold standard for NC H3 exam prep in English. Schedule the June 20–22 class during your board wait so you walk into PSI sharp and confident.
What you'll cover: Residential and commercial load calculations, duct design, blueprint reading, state codes, Business & Law strategy, open-book navigation technique. Covers H1, H2, and H3 — future-proofs you for an H2 upgrade later.
Location: Apex, NC (~2.5 hrs from Charlotte — worth every mile for the June 20–22 class)
Format: 3-day in-person (Fri–Sun, 8am–5pm) · 27 total study hours
Once the Board approves your application you'll receive written notification with PSI scheduling instructions. Schedule and sit within 90 days of that letter.
Exam 1 — Heating License Exam: 4 hours, open book, 90 questions. HVAC systems, codes, load calculations.
Exam 2 — Business & Law Exam: 90 minutes, open book, 50 questions. NC contractor laws, business requirements.
Both at PSI Testing — Charlotte. Exams offered daily. PSI provides an ACCA duct slide rule at the center — practice with one beforehand so you're not learning it on test day. Passing score is 70%; aim for 75%+ in practice.
Two final tasks before your license is active:
Surety Bond: You don't pay the full $2,000 upfront. You pay an annual premium of roughly 10–20% of the bond value depending on your credit — so typically $200–$400/year. Shop Bryant Surety Bonds, Travelers, and local NC providers.
Activation Fee: Pay $150 to the Board. Your H3 Class I Contractor License is now active. You can legally operate, pull permits, hire techs, and advertise statewide.
After licensing: Register your LLC at sosnc.gov (~$125), get a free EIN at irs.gov, open a business bank account, get general liability and commercial auto insurance.
Leaves ~$5,600–$5,900 of your $7,000 for truck, tools, insurance, and first jobs.