Trade certification · HVAC
HVAC Technician Core (NATE-style) — Practice Exam
The general knowledge exam HVACR technicians take before a NATE specialty: safety, tools, basic construction, basic science and math, comfort conditions, temperature and humidity measurement, and basic electricity (circuits, diagrams, motors and controls).
Questions last checked against the official sources on October 6, 2026.
The real exam at a glance
- Exam
- 50 questions, 1.5 hours, closed book
- Weights
- Electrical 26%, safety 18%, desired conditions 14%, measurements 14%, tools 10%, science 10%, construction 8%
- Outline
- NATE Core KATE
- Next step
- A NATE installation or service specialty exam
What you'll practise
Try a question
How many milliamps are in one amp?
- 10
- 100
- 1,000
- 1,000,000
Show the answer
C. 1,000 — Milli = one-thousandth.
Sample questions by topic (in English)
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Questions about the HVAC Core (NATE-style)
Is this the official HVAC Core (NATE-style)?
No. Semplr is independent and not affiliated with the exam body. We write every question ourselves, in the official format and at the official level.
What is the real HVAC Core (NATE-style) like?
Exam: 50 questions, 1.5 hours, closed book. Weights: Electrical 26%, safety 18%, desired conditions 14%, measurements 14%, tools 10%, science 10%, construction 8%. Outline: NATE Core KATE. Next step: A NATE installation or service specialty exam.
How is my practice marked?
Instantly. You see your score against the pass mark, and an explanation for every question — including the ones you got right.
Can I take it on my phone?
Yes. The whole mock exam works on a phone, and your progress is saved in your browser.
Ready for a full run?
One sitting, real timing, then your score against the pass mark.
Start the free mock exam