NATE Air Conditioning Exam Pass Rate, Format & Study Guide

NATE certification in air conditioning service requires the Core exam (50 multiple-choice questions in 1.5 hours) and the Air Conditioning Service specialty exam (100 questions in 2.5 hours); both are closed book (NATE proctor script). NATE sets passing scores through a passing score study with experienced HVAC professionals; they may vary slightly by form and the numeric cut score is not published. This portal's 150-question mock exam combines the Core and AC Service outlines; because NATE publishes no cut score, use your percentage as a self-check.

NATE certification is a widely recognized credential for HVAC technicians; many employers and manufacturers use it as a mark of skill.

HVAC service technicians preparing for the NATE Core and Air Conditioning Service exams.

The certifying body does not publicly publish an official pass rate for this exam. Be wary of third-party sites citing a specific number here — treat any pass-rate claim you see elsewhere for this exam as unverified.

Ask your NATE testing organization about retake scheduling and fees; NATE publishes its current policies on natex.org.

NATE reports pass or fail for each exam and does not publish a numeric cut score, so this guide does not state one. Use the percentage in this portal as a self-check, not a prediction. Format: Core 50 questions in 90 minutes and Air Conditioning Service 100 questions in 150 minutes, closed book. No official pass rate is available for this exam, so none is quoted here.

NATE certification in air conditioning service requires the Core exam (50 multiple-choice questions in 1.5 hours) and the Air Conditioning Service specialty exam (100 questions in 2.5 hours); both are closed book (NATE proctor script). NATE sets passing scores through a passing score study with experienced HVAC professionals; they may vary slightly by form and the numeric cut score is not published. This portal's 150-question mock exam combines the Core and AC Service outlines; because NATE publishes no cut score, use your percentage as a self-check. Core exam: 50 questions in 1.5 hours · Air Conditioning Service exam: 100 questions in 2.5 hours · closed book, multiple choice · pass marks set by study, not published. NATE reports pass or fail for each exam and does not publish a numeric cut score, so this guide does not state one. Use the percentage in this portal as a self-check, not a prediction.

• Core: Basic Electricity8.7%
• Core: Safety6%
• Core: Taking Temperature and Humidity Measurements4.7%
• Core: Achieving Desired Conditions4.7%
• Core: Tools3.3%
• Core: Using Basic Science3.3%
• Core: Basic Construction2.7%
• AC Service: Installation10%
• AC Service: Service30%
• AC Service: System Components16.7%
• AC Service: Applied Knowledge10%

The content outline spreads questions across 11 areas: Core: Basic Electricity (8.7%); Core: Safety (6.0%); Core: Taking Temperature and Humidity Measurements (4.7%); Core: Achieving Desired Conditions (4.7%); Core: Tools (3.3%); Core: Using Basic Science (3.3%); Core: Basic Construction (2.7%); AC Service: Installation (10.0%); AC Service: Service (30.0%); AC Service: System Components (16.7%); AC Service: Applied Knowledge (10.0%).

NATE does not require a degree or license to sit its knowledge exams; it recommends field experience first. Check NATE for current recommendations.

Fees are set by the testing organization or proctor; confirm them where you register.

NATE certifications require recertification through continuing education hours or retesting; check NATE for the current cycle.

Start with the heaviest areas of the content outline: AC Service: Service (30.0%); AC Service: System Components (16.7%); AC Service: Installation (10.0%). Then work through the remaining areas, and finish with timed full-length practice runs of 150 questions in one sitting.

Content outlines, fees and passing standards change; this guide follows the official documents listed under Verification as of October 2026. Check NATE before you register.