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Air Conditioning Repair Cheat Sheet 2026

The 30 highest-yield Air Conditioning Repair facts, distilled from real exam questions. Print it, save it as a PDF, or study it here ā€” free, no sign-up.

100 questions
120 min time limit
70% to pass
  1. Which of the following actions is a direct violation of the EPA's Section 608 "prohibition on venting"? ā†’ Knowingly releasing R-22 from a hose when disconnecting from a residential system.
  2. In a rectangular sheet metal duct system, what is the primary purpose of installing turning vanes inside a sharp 90-degree elbow? ā†’ To reduce air turbulence and minimize static pressure loss.
  3. Which EPA regulation governs the handling, recovery, and recycling of refrigerants used in AC systems in the United States? ā†’ Section 608 of the Clean Air Act
  4. What is the purpose of a condensate trap installed on an AC air handler? ā†’ To prevent negative duct pressure from pulling sewer gases back through the drain line
  5. Which of the following is the most direct and primary indicator of non-condensables being present in a refrigeration system? ā†’ Excessively high discharge (head) pressure.
  6. Which organization certifies technicians to fix refrigeration systems? ā†’ NATE
  7. How many BTU/hr are equivalent to one ton of refrigeration? ā†’ 12,000
  8. During a maintenance check, the technician notices the outdoor fan motor is drawing more amps than its nameplate rating. What is the most likely cause? ā†’ Failing motor bearings or a failing capacitor
  9. In a standard refrigeration cycle, what is the primary function of the evaporator? ā†’ To absorb heat from the space to be cooled.
  10. What happens in a condenser in a cooling and refrigeration system? ā†’ The refrigerant releases the latent heat.
  11. Regarding the air temperature blend door in the circuit, each of the following statements is accurate. ā†’ It operates on CAN Class A network
  12. Which measurement indicates proper lubrication is needed on older belt-drive blower motors? ā†’ Motor running hot above its rated temperature or unusual squealing noise
  13. The process of adding heat to the refrigerant vapor after it has completely boiled into a gas is known as: ā†’ Superheating
  14. A technician uses a megohmmeter to test a compressor's windings to ground. The meter displays a reading of 0.5 MĪ© (megohms). What does this result indicate? ā†’ The motor insulation is breaking down and shorted to ground.
  15. The following facts about an air conditioning performance test are all true, EXCEPT for ā†’ To avoid outside odor, operate AC System in RECIRC rather than FRESH mode
  16. During a preventive maintenance visit, a technician finds the condenser fins are bent and partially blocking airflow. What is the correct action? ā†’ Straighten the fins using a fin comb
  17. What is the correct method for disposing of old compressor oil removed during system maintenance? ā†’ Dispose of it as hazardous waste through an approved recycling or disposal facility
  18. If the condenser fan wasn't working, what high-side and low-side pressure gauge readings might a technician discover? ā†’ Both high-side high and low-side are high
  19. In load calculations, the U-value of a building assembly describes which property? ā†’ The overall heat transfer coefficient of the assembly
  20. What unit is commonly used to measure the cooling capacity of an air conditioning system? ā†’ BTU/hr
  21. What is the primary consequence of installing an oversized air conditioning system? ā†’ Short cycling and poor humidity control
  22. What is the correct procedure for testing a dual-run capacitor on a residential AC unit? ā†’ Discharge it, then test capacitance with a capacitor-rated multimeter
  23. In a properly operating refrigeration cycle, what is the state and pressure of the refrigerant as it enters the compressor? ā†’ Low-pressure, low-temperature superheated vapor
  24. When disposing of an appliance containing CFC, HCFC, or HFC refrigerant, EPA Section 608 regulations require that: ā†’ The refrigerant must be recovered by an EPA-certified technician.
  25. In a residential load calculation, what category includes heat generated by occupants, lighting, and household appliances? ā†’ Internal heat gain
  26. A technician is recovering refrigerant from a system with a known leak. Which of the following is the correct practice? ā†’ Recover as much refrigerant as possible, reaching the required vacuum level.
  27. What happens in an evaporator in a cooling and refrigeration system? ā†’ The refrigerant absorbs the latent heat
  28. What does EER (Energy Efficiency Ratio) measure in an air conditioning system? ā†’ Cooling output in BTU/h divided by power input in watts at a single operating condition
  29. Before the heating season, what should you do to ensure your HVAC system gets proper maintenance? ā†’ Set up regular maintenance appointments
  30. What is the primary function of the metering device in the refrigeration cycle? ā†’ To create a pressure drop, which lowers the refrigerant's boiling point
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