The North American Technician Excellence is a professional certification assessment in us. Thorough preparation is essential to demonstrate your knowledge and competency in this field.
Our comprehensive collection of free NATE practice questions covers all exam domains and topics. Use these detailed study materials to build confidence and improve your test performance.
Numbers in brackets link to the official sources listed under Sources & last verified. Dates that have passed are removed automatically.
| Item | Detail | Source · Verified |
|---|---|---|
| Number of questions (CHP-5 — each exam) | 30 questions per exam[1] | NATE · Oct 25, 2026 |
| Number of questions (Senior Level Efficiency Analyst) | 100 questions; open book[2] | NATE · Oct 25, 2026 |
| Number of questions (Traditional pathway — Core) | 50 questions (Core) and 100 questions (Specialty)[6] | NATE · Oct 25, 2026 |
| Number of questions (Traditional pathway — Specialty) | 100 questions[6] | NATE · Oct 25, 2026 |
| Time limit (CHP-5 — each exam) | 60 minutes per exam[1] | NATE · Oct 25, 2026 |
| Time limit (Senior Level Efficiency Analyst) | 240 minutes (4 hours)[2] | NATE · Oct 25, 2026 |
| Passing score (Senior Level Efficiency Analyst) | 75%[3] | NATE · Oct 25, 2026 |
| Passing score (Traditional pathway — Core and installation/service specialties) | 70% or higher[3] | NATE · Oct 25, 2026 |
| Exam fee (Live Online Proctoring) | Current prices are shown in your myNATE account (LOP tab)[4] | NATE · Oct 25, 2026 |
| Exam fee (Recertification using continuing education hours) | $30 first specialty, +$5 each additional specialty[5] | NATE · Oct 25, 2026 |
| Exam fee (Traditional pathway) | Varies by NATE testing organization[3] | NATE · Oct 25, 2026 |
| Retake policy (Lapsed certification) | Must retake Core (if required) and specialty tests[5] | NATE · Oct 25, 2026 |
| Validity (CHP-5 and Traditional pathway) | Two years[5] | NATE · Oct 25, 2026 |
| Renewal (CHP-5 and Traditional pathway) | 16 continuing education hours plus renewal fee, or retest[7] | NATE · Oct 25, 2026 |
| Delivery | In person with a NATE Testing Organization or remotely proctored online[8] | NATE · Oct 25, 2026 |
| Eligibility (Senior Level Efficiency Analyst) | Two Service specialty certifications required[9] | NATE · Oct 25, 2026 |
| Score release | Computer-based: immediately; paper: 2–3 weeks[3] | NATE · Oct 25, 2026 |
| Testing window (CHP-5) | Up to six months between exams[10] | NATE · Oct 25, 2026 |
Important: The NATE examination requires thorough understanding of all core subject areas. Review the official us exam guidelines and ensure you meet all eligibility requirements before scheduling your test date.
Interactive NATE - North American Technician Excellence resources on PracticeTestGeeks, free to start:
According to NATE, “Each exam contains 30 questions and has a 1-hour time limit.”[1]
The content areas below are copied from the official NATE content outline published by NATE, with the share of the exam each area carries. The right-hand column shows which of our practice sets covers it.
| Official content area | Weight | Practice on this site |
|---|---|---|
| ACHIEVING DESIRED CONDITIONS[11] | 14% | NATE Air Conditioning Practise how airflow, cooling and heating output and system controls work together to bring a space to its target condition. |
| BASIC CONSTRUCTION[11] | 8% | NATE Air Distribution Review how building structure, ductwork and openings affect air movement and equipment placement. |
| BASIC ELECTRICITY[11] | 26% | NATE Electrical and Controls Work through circuits, meter readings, motors, relays and control wiring until you can predict what a fault will do. |
| SAFETY[11] | 18% | NATE Gas Heating Drill combustion safeguards, flame proving, lockout habits and the protective devices on fuel-burning equipment. |
| TAKING TEMP. & HUMIDITY MEASUREMENTS[11] | 14% | NATE Heat Pumps Practise choosing the right instrument and reading temperature and humidity values to judge system performance. |
| TOOLS[11] | 10% | NATE Refrigeration Know what each gauge, meter and service tool measures and when it is the right one to use. |
| USING BASIC SCIENCE[11] | 10% | NATE Oil Heating Review heat transfer, pressure, states of matter and combustion principles that explain how equipment behaves. |
Prepare for the NATE - North American Technician Excellence exam with our free practice test modules. Each quiz covers key topics to help you pass on your first try.
These are practice questions written for this site, not questions from the real exam. Each explanation shows why the right answer is right and why the others are wrong.
Question: What condition does a very high return static pressure typically indicate?
Answer: B. Restricted return airflow due to clogged filter, blocked return grilles, or undersized return duct
Explanation:
The correct answer is restricted return airflow from a clogged filter, blocked return grilles or an undersized return duct. High return static pressure means the blower is pulling hard against resistance on the return side, so the system is starved for air.
Oversized ductwork is wrong because larger ducts lower resistance and pressure. Excessive supply air is wrong because the reading comes from the return side, where a shortage of air raises the pressure drop. Refrigerant overcharge is wrong because it is a refrigerant-side problem and does not show up as a return static pressure reading.
Rule to remember: high static pressure points to restriction in the duct system, and low static pressure points to too little resistance or weak airflow. Check the filter and return path first.
Question: What MERV rating range is recommended for residential HVAC filters to balance filtration and airflow?
Answer: B. 5–8
Explanation:
The correct answer is 5-8. Filters in that range give adequate filtration for residential equipment while leaving enough airflow and avoiding excessive pressure drop.
The 1-4 range is wrong because it filters too little to be a sensible recommendation. The 9-13 range is wrong because the denser media starts to restrict airflow in a typical residential blower. The 14-16 range is wrong for the same reason, only more so, and ordinary residential systems are not built to push air through it.
Rule to remember: a higher rating catches more particles but adds resistance. A filter that is too restrictive can cause the same high static pressure and low airflow problems you see with a dirty filter.
Question: What does the flame sensor do in a modern electronic ignition furnace?
Answer: B. Passes a small DC current through the flame to prove ignition and keep the gas valve open
Explanation:
The correct answer is that the flame sensor passes a small DC current through the flame to prove ignition and keep the gas valve open. This is flame rectification: the ionized flame lets current flow, and the control board reads that current as proof the burner is lit.
Measuring combustion air temperature is wrong because the sensor does not read temperature. Controlling burner gas pressure is wrong because that is the job of the gas valve and regulator. Monitoring heat exchanger temperature is wrong because that is handled by the limit switches.
Rule to remember: the sensor proves flame. If it cannot prove flame, the control closes the gas valve, which prevents unburned gas from building up. A dirty sensor is a common reason a furnace lights and then shuts off.
Start with the official NATE material for the exam you are taking, because the question counts, time limits and passing score differ between the Traditional pathway, CHP-5 and the Senior Level Efficiency Analyst exam. Note which specialty you need and whether Core is required.
Next, take one of our practice sets for that specialty without looking anything up. Record which official content area each missed question belongs to. Basic Electricity carries the largest weight in the outline, so give it extra time if it shows up often in your misses.
Our questions are written by us and are not real exam questions, so use them to find weak areas rather than to predict what you will see. Before booking, check your testing organization's fee and scheduling details, and confirm anything unclear on natex.org.
Join thousands of candidates who have used our free practice tests to prepare for the North American Technician Excellence. Start practising today and build the confidence you need to succeed. Practice with the free NATE - North American Technician Excellence practice test on PracticeTestGeeks (7 questions with answer explanations).
Try these questions from our free NATE - North American Technician Excellence practice tests. The correct answer and an explanation follow each question.
What is the primary safety device that shuts off the gas valve if the pilot flame is extinguished on a standing pilot furnace?
Answer: B. Thermocouple
The thermocouple generates a small millivolt signal that holds the gas valve open; when the pilot goes out the signal drops and the valve closes.
What is the primary control's 'safety timing' function on an oil furnace?
Answer: B. Allow a limited time for ignition then shut down the burner if no flame is proven
Safety timing (typically 45–90 seconds) limits how long unburned oil can accumulate before locking out the burner to prevent explosion.
LP (propane) gas manifold pressure for residential furnaces is typically set to which value?
Answer: B. 7–11 inches WC
Propane furnaces require higher manifold pressure than natural gas, typically 10–11 inches WC, because propane has different combustion characteristics.
What is a condensate drain trap used for on a high-efficiency furnace?
Answer: B. Prevent flue gases from backing up through the condensate drain while allowing water to drain freely
The condensate trap maintains a water seal that blocks furnace gases from escaping through the drain while permitting condensate to flow out.
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