NCEES
PE Mechanical
Principles and Practice of Engineering (PE) Mechanical Exam
The professional licensure exam for mechanical engineers, taken after the FE and qualifying work experience. Examinees choose one of three modules (HVAC and Refrigeration, Machine Design and Materials, or Thermal and Fluid Systems); this blueprint follows the HVAC and Refrigeration module.
What's on the exam
PE Mechanical — HVAC and Refrigeration CBT Exam Specifications (effective October 2025)
HVAC Loads and Psychrometrics
18–27 questionsHeating and cooling loads · Heating and cooling processes · Humidification and dehumidification processes · Psychrometric analysis · Altitude and low-temperature effects
HVAC and Refrigeration Distribution and Systems
20–30 questionsAir distribution systems and ductwork · Air quality and ventilation · Fluid distribution systems and piping · Hydronic and steam systems · Refrigeration systems and cycles
HVAC Equipment and Components
24–36 questionsCooling towers and fluid coolers · Boilers and furnaces · Heat exchangers, condensers, and evaporators · Pumps, compressors, and fans · Coils and energy recovery systems
Supportive Knowledge (HVAC and Refrigeration)
8–12 questionsCodes and standards · Acoustics and vibration control · Economic analysis · Controls and instrumentation
Frequently asked questions
How much does the PE Mechanical cost?
The PE Mechanical costs $400. $400 NCEES exam fee; state boards may add separate application and licensure fees.
How long is the PE Mechanical and how many questions does it have?
80 questions — 9-hour appointment (8-hour exam plus tutorial and a scheduled break).
What do you need to pass the PE Mechanical?
Scaled pass/fail standard set by NCEES (no fixed percentage).
Can you retake the PE Mechanical?
Up to 3 attempts in a 12-month period.
What is the best way to study for the PE Mechanical?
Start from the official outline and your primary study materials: the exam is weighted by domain (HVAC Loads and Psychrometrics 18–27 questions, HVAC and Refrigeration Distribution and Systems 20–30 questions, HVAC Equipment and Components 24–36 questions, Supportive Knowledge (HVAC and Refrigeration) 8–12 questions). Once you've learned the material, spaced-repetition flashcards organized by those domains are an efficient way to retain it and refresh it before test day.
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