About NV-C21 Exam Prep

An independent practice platform for the Nevada C-21 Refrigeration and Air Conditioning Contractor Trade Exam (NV-C21) exam - real questions across every exam domain, each with a plain-language explanation.

What's on the NV-C21 exam

The Nevada C-21 Refrigeration and Air Conditioning Contractor Trade Exam (NV-C21) exam is organized into 22 knowledge domains. It has 85 questions and is completed in 3 hours. Here is what it covers:

• Piping
• Insulation
• Hangers and Supports
• Sound, Vibration and Seismic Control
• Heating and Cooling Principles
• Refrigerants and Refrigeration
• Load Calculations
• Testing, Adjusting and Balancing
• Controls
• Machine Room
• A/C and Heat Pump Equipment
• Furnaces and Heaters
• Hydronics
• Chimneys, Flues and Vents
• Combustion Air
• Fuel Systems
• Ducts
• Evaporative Cooling
• Chillers
• Solar
• Ventilation and Exhausts
• Safety

Every practice question on this site is organized across these 22 domains, so your study tracks the real exam structure instead of guesswork. As you answer, the per-domain analytics surface the areas still costing you points, so your review goes where it moves your score.

What we believe good exam prep looks like

Realistic practice beats passive reading. Every question is written to mirror the style and difficulty of the real exam, with a clear explanation of why the right answer is right and the others aren't.

Your weak spots should find you. Domain analytics, mistake review, and re-drilling are built in, so study time goes where it moves your score.

Pricing should be simple. One payment for a fixed access window matched to your exam date. No subscription, no auto-renewal, and 10 free questions to try before you spend anything.

Get in touch

Questions, feedback, or something not working? Email support@boardmentor.study - candidate messages are read and answered.