ASHRAE Cheat Sheet 2026

The 30 highest-yield ASHRAE facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Which ASHRAE method is the current standard procedure for calculating residential and commercial cooling and heating loads? → Radiant Time Series (RTS) method
2. What is the primary design consideration in material properties for American Society of Heating, Refrigeration and Air Conditioning Engineers Certification? → Safety, functionality, and compliance with applicable codes
3. Which component is responsible for removing heat from an HVAC system? → Evaporator coil
4. How should engineering changes to regulatory compliance be managed? → Through a formal change control process with documentation and approval
5. What communication protocol is widely recognized by ASHRAE as the standard for building automation and control network (BACnet) interoperability? → BACnet (ASHRAE Standard 135)
6. What quality control measure is most important in safety standards? → Continuous quality assurance throughout the project lifecycle
7. What quality control measure is most important in testing methods? → Continuous quality assurance throughout the project lifecycle
8. Which of the following is a common strategy for reducing a building's carbon footprint? → Using renewable energy sources.
9. What happens to the humidity ratio during a pure sensible heating process? → Humidity ratio remains constant while dry-bulb temperature increases
10. Which analysis method is essential for regulatory compliance? → Quantitative analysis using validated engineering methods and calculations
11. What is the dew point temperature of an air sample? → The temperature to which air must be cooled at constant pressure for condensation to begin
12. What quality control measure is most important in technical specifications? → Continuous quality assurance throughout the project lifecycle
13. What type of control action does a proportional-integral-derivative (PID) controller use to eliminate steady-state offset in HVAC systems? → Integral action
14. Which ASHRAE standard provides guidelines for indoor air quality in commercial buildings? → ASHRAE 62.1
15. What is the primary function of a refrigeration system? → Remove heat to lower temperature.
16. Which ASHRAE Handbook volume is the primary reference for fundamental heat and mass transfer principles? → ASHRAE Handbook – Fundamentals
17. How is humidity ratio (W) defined in psychrometrics? → Ratio of water vapor mass to dry air mass
18. What quality control measure is most important in material properties? → Continuous quality assurance throughout the project lifecycle
19. Which analysis method is essential for quality assurance? → Quantitative analysis using validated engineering methods and calculations
20. In ASHRAE conduction heat transfer calculations, what does the R-value of a building assembly represent? → Thermal resistance per unit area
21. Why is high-performance insulation important in sustainable buildings? → Reduces heat loss and improves efficiency.
22. Which analysis method is essential for safety standards? → Quantitative analysis using validated engineering methods and calculations
23. What does wet-bulb temperature primarily indicate about an air sample? → The cooling effect of evaporation, which correlates with the moisture content of the air
24. What quality control measure is most important in quality assurance? → Continuous quality assurance throughout the project lifecycle
25. What professional responsibility applies when practicing safety standards? → Holding paramount the safety, health, and welfare of the public
26. How should engineering changes to project management be managed? → Through a formal change control process with documentation and approval
27. What is the approximate specific volume of standard air at 70°F (21°C) and standard sea-level pressure? → 13.5 ft³/lb (0.843 m³/kg)
28. How should engineering changes to material properties be managed? → Through a formal change control process with documentation and approval
29. What is the main benefit of demand-controlled ventilation (DCV)? → Adjusts ventilation rates based on occupancy.
30. What is the primary purpose of ventilation in buildings? → Improve indoor air quality and remove pollutants.