Short Answer: NATE specialty exams have 100 questions in 2.5 hours and come in installation and service versions. Passing a service exam also gives the matching installation certification.
Quick Facts
| Questions | 100 |
|---|---|
| Time | 2.5 hours |
| Types | Installation and service |
| Bonus | Service pass also awards installation |
| Renewal | Every 2 years: 16 CEHs or retest |
How the Traditional Pathway Works
NATE certification on the traditional pathway takes two exams. The first is the Core exam, which covers general knowledge every technician needs. The second is a specialty exam, which tests one type of system in depth. According to NATE, specialty exams have 100 questions and a time limit of 2.5 hours. You need to pass both the Core and a specialty to be certified.
NATE publishes a Knowledge Areas of Technician Expertise (KATE) document for every specialty. It lists the topics and their weights. Download the KATE for your specialty before you start studying, because it is the closest thing to an official outline.
Installation or Service?
Specialties are offered at two levels.
- Installation specialties focus on putting new equipment in correctly: sizing, setting, connecting, charging, starting up and checking performance.
- Service specialties focus on maintenance, diagnosis and repair: troubleshooting electrical and refrigeration faults, combustion analysis and component replacement.
NATE notes that a technician who earns a service certification is also awarded the corresponding installation certification. In addition, earning the Air-to-Air Heat Pump service certification also awards the matching Air Conditioning certification.
If you mostly install new systems, the installation exam is a natural fit. If you diagnose and repair equipment, take the service exam. It is generally the more demanding test, but it gives you both credentials.
The Specialties Offered
NATE’s traditional pathway page lists these specialties. Always check NATE’s site for the current list.
Available as installation or service:
- Air Conditioning: split and packaged cooling systems, refrigerant charging, airflow and controls.
- Air Distribution: duct design, airflow measurement, static pressure and balancing.
- Air-to-Air Heat Pump: heating and cooling modes, reversing valves, defrost and auxiliary heat.
- Gas Heating (Air): gas furnaces, combustion, venting, ignition and safety controls.
Service only:
- Oil Heating (Air): oil furnaces, burners, nozzles and combustion testing.
- Hydronics Gas and Hydronics Oil: boilers, circulators, expansion tanks and hydronic controls.
- Light Commercial Refrigeration: reach-ins, walk-ins and other small commercial systems.
- Commercial Refrigeration: larger refrigeration systems and their controls.
NATE also offers Spanish versions of some exams, including Air Conditioning, Heat Pump and Gas Heating service.
How to Choose
Ask three questions.
- What do you work on most? If most of your calls are residential cooling and heat pumps, Air Conditioning or Heat Pump is a good fit. If you work in a cold climate on furnaces, Gas Heating may be the best choice.
- What does your employer value? Some employers and manufacturers ask for particular specialties. Check before you book.
- Where are you in your career? Newer technicians may prefer an installation specialty or the CHP-5 pathway. Experienced technicians often go straight to service.
What Specialty Exams Test
Each KATE is different, but most specialty exams cover similar categories:
- Installation and start-up: equipment placement, line sets, electrical connections, evacuation and charging.
- Airflow and air distribution: CFM, static pressure, duct design and filters.
- Refrigeration cycle: superheat, subcooling, pressure-temperature relationships and metering devices.
- Electrical and controls: thermostats, control boards, motors, capacitors and safety devices.
- Combustion and venting for heating specialties: gas pressure, combustion analysis, draft and venting rules.
- Troubleshooting for service specialties: diagnosing faults from symptoms and measurements.
Strong Core knowledge carries over. Our NATE Core Exam Study Guide covers the electricity, psychrometrics and safety topics that every specialty builds on.
The CHP-5 Pathway
NATE also offers a second pathway, the Certified HVAC Professional (CHP-5). Instead of one Core and one specialty exam, CHP-5 uses five 30-question exams. NATE lists the five subject areas as HVAC Fundamentals, Electrical and Controls, Comfort and Airflow, Installation, and Service. NATE recommends taking them in order but allows any order, and gives candidates time between exams to study. CHP-5 is designed for newer technicians who prefer to test in smaller steps.
Senior and Other Credentials
Technicians who already hold two service specialties in an approved combination can take the Senior Level Efficiency Analyst exam, which NATE describes as its top-level credential. NATE also offers other credentials, such as the Ground Source Heat Pump Loop Installer certification given jointly with the International Ground Source Heat Pump Association, and entry-level certificates such as Ready-to-Work and HVAC Support Technician. These have their own rules, so check NATE’s pages for each.
Key Skills by Specialty
The KATE is the official outline, but these field skills sit behind many questions in each area.
Air Conditioning. Know how to check charge using superheat for fixed metering devices and subcooling for thermostatic expansion valves, following the manufacturer’s charging chart. Understand how a dirty condenser coil raises head pressure, how low airflow across the evaporator lowers suction pressure and can frost the coil, and how a failed run capacitor affects a compressor or fan motor.
Air Distribution. Be comfortable measuring total external static pressure with a manometer and comparing it with the blower table on the equipment. Know how duct size, length, fittings and filters add resistance, and why return air paths matter. Basic airflow arithmetic, such as estimating CFM from velocity and free area, is common.
Heat Pump. Understand the reversing valve and how it changes the direction of refrigerant flow, the defrost cycle and its controls, balance points and auxiliary or emergency heat. Many questions ask you to identify a fault from symptoms in heating mode, such as a stuck reversing valve or a failed defrost sensor.
Gas Heating. Know the sequence of operation for a modern furnace: call for heat, inducer start, pressure switch proof, ignition, flame sensing, blower delay. Be ready for questions on manifold gas pressure, temperature rise across the heat exchanger, venting categories, combustion air and carbon monoxide safety.
Hydronics and Oil. Hydronics exams cover boilers, circulator placement, expansion tanks, air elimination and zoning. Oil heating covers burners, nozzles, fuel pumps, filters and combustion efficiency testing.
Refrigeration. Light Commercial and Commercial Refrigeration exams cover evaporator temperatures, defrost methods, metering devices, refrigerant controls and the low-temperature applications found in walk-ins and display cases.
On Exam Day
Specialty exams are long: 100 questions in 2.5 hours gives you about a minute and a half per question. Read every question carefully, because many describe a symptom and ask for the most likely cause, and more than one answer can look possible. Eliminate the clearly wrong choices first. Flag any question that needs a long calculation and come back to it once the quick ones are done. Bring the identification your testing organisation requires and follow its rules on calculators and personal items.
Keeping Your Certification
NATE certification lasts two years. According to NATE, you can renew by:
- earning 16 continuing education hours (CEHs) in your specialty area and paying the renewal fee, or
- retaking and passing your specialty exam.
NATE allows a grace period after expiry. Fees and grace periods can change, so check NATE’s recertification page before your certification runs out.
Preparing for a Specialty Exam
- Pass, or prepare for, the Core exam first. Our NATE Core Practice Test (50 Questions) has 50 questions per attempt with explanations.
- Download your specialty’s KATE and highlight the heaviest-weighted areas.
- Review manufacturer installation instructions for equipment you work on. Many questions test standard practice found there.
- Practise calculations: superheat, subcooling, temperature rise, CFM and static pressure.
- Study the refrigerant rules in EPA 608 Practice Tests and Study Guides. Although NATE is separate from EPA certification, refrigerant handling appears on many specialty exams.
- Book a proctored exam through a NATE testing organisation.
Is a Specialty Worth It?
NATE certification is voluntary, so the value depends on your market. Some employers use it in hiring or pay decisions, and some equipment manufacturers and utility programmes recognise it. For many technicians the bigger benefit is the study itself: preparing for a specialty forces a structured review of systems you may only know from habit. The U.S. Bureau of Labor Statistics notes that HVACR technicians usually need postsecondary training or an apprenticeship and that some states and localities require licences, so plan NATE alongside the licences your area requires.
Common Mistakes
- Choosing a specialty you rarely work on. Field experience is the best preparation.
- Ignoring the KATE. It tells you what is on the exam and how much each area is worth.
- Underestimating airflow. Static pressure and CFM questions appear in several specialties.
- Letting certification lapse. Track your CEHs and renewal date.
Steps to Take
- Pass the Core exam.
- Pick the specialty that matches your work.
- Study the specialty KATE.
- Take the exam.
- Plan your CEHs for renewal.
Frequently Asked Questions
Which NATE specialty should I take first?
Choose the one that matches most of your daily work. Residential technicians often start with Air Conditioning, Heat Pump or Gas Heating, because those systems make up much of their work.
Can I hold more than one specialty?
Yes. Many technicians add specialties over time. Each one requires passing its own specialty exam.
Is there a Spanish version?
NATE offers several exams in Spanish, including some service specialties. Check NATE's exam pages for the current list.
Does NATE certification replace a state licence?
No. NATE is a voluntary industry certification. State and local licensing rules still apply, and EPA 608 is still required to handle regulated refrigerants.