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EPA Section 608 Universal Technician Certification

EPA 608 Universal HVAC Practice Test

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Questions updated at Jul 18, 2026, 1:30 PM CDT

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Today's 10 EPA 608 Universal HVAC questions

Use this EPA 608 Universal HVAC practice test to review EPA Section 608 Universal Technician Certification. Questions rotate daily and each answer links back to the source used to write it.

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Question 1 of 10
Objective Core.21 Core

Which of the following statements accurately describes the relative ozone depletion potential (ODP) of CFCs, HCFCs, and HFCs?

Concept tested:
Source:EPA Section 608 Technician Certification Test Topics
Question 2 of 10
Objective III.08 Type III

When recovering refrigerant from a low-pressure system, what is the primary benefit of recovering the liquid refrigerant first?

Concept tested:
Question 3 of 10
Objective II.12 Type II

During the evacuation of a post-1993 high-pressure appliance with a full charge of less than 200 pounds, what vacuum level is required to ensure proper refrigerant removal?

Concept tested:
Question 4 of 10
Objective I.22 Type I

When servicing an appliance with multiple, independent refrigerant circuits, how are they handled for EPA 608 reporting purposes?

Concept tested:
Question 5 of 10
Objective Core.36 Core

A technician is returning recovered refrigerant to a system owned by the same customer. According to EPA regulations, what condition is required for this return without first undergoing reclamation?

Concept tested:
Question 6 of 10
Objective III.13 Type III

What is the primary purpose of a purge unit in an HVAC system?

Concept tested:
Question 7 of 10
Objective I.23 Type I

A Type I refrigerant recovery technician is diagnosing a system and suspects the presence of noncondensables. Which diagnostic technique would most effectively confirm this suspicion based on EPA 608 guidelines?

Concept tested:
Question 8 of 10
Objective II.32 Type II

An owner or operator discovers an appliance with a full charge of 50 or more pounds is leaking ozone-depleting refrigerant above the trigger rate. What is required?

Concept tested:
Question 9 of 10
Objective Core.63 Core

Which organizations are authorized by the EPA to certify refrigerant recovery and recycling equipment, ensuring compliance with established standards?

Concept tested:
Question 10 of 10
Objective III.05 Type III

For low-pressure leak-test pressurization, what is the EPA's preferred method for achieving the required pressure?

Concept tested:
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Source EPA Section 608 Technician Certification Test Topics

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The free daily EPA 608 Universal HVAC set includes crawlable question text, answer choices, correct answer labels, objective mapping, and source links. Only the first SEO card includes answer explanations and any extra learning features. Pro-only bank questions stay locked; this section mirrors only the 10 free daily questions already shown on this page.

Question 1 Which of the following statements accurately describes the relative ozone depletion potential (ODP) of CFCs, HCFCs, and HFCs?

Answer choices

  1. A. CFCs generally have higher ODP than HCFCs, and HCFCs have higher ODP than HFCs
  2. B. HFCs generally have higher ODP than HCFCs, and HCFCs have higher ODP than CFCs
  3. C. CFCs and HCFCs have the same ODP, while HFCs have a significantly lower ODP
  4. D. HFCs generally have higher ODP than CFCs, and CFCs have higher ODP than HCFCs

Correct answer

CFCs generally have higher ODP than HCFCs, and HCFCs have higher ODP than HFCs

CFCs contain chlorine and deplete the ozone layer more than HCFCs, which in turn deplete it more than HFCs. HFCs do not contain chlorine and therefore have an ODP of zero.

Wrong-answer review

  • B. HFCs generally have higher ODP than HCFCs, and HCFCs have higher ODP than CFCs: This reverses the correct order by putting HFCs above ozone-depleting refrigerant families.
  • C. CFCs and HCFCs have the same ODP, while HFCs have a significantly lower ODP: CFCs and HCFCs are not treated as having the same ozone-depletion potential.
  • D. HFCs generally have higher ODP than CFCs, and CFCs have higher ODP than HCFCs: HFCs do not have higher ODP than CFCs because HFCs do not contain chlorine or bromine.

Extra learning features

Why candidates miss this

The belief that HFCs possess a higher ozone depletion potential than HCFCs and CFCs stems from a misunderstanding of how these refrigerants interact with the ozone layer. HFCs, lacking chlorine atoms, have an ODP of zero, while HCFCs and CFCs contribute to ozone depletion, with CFCs generally having the highest ODP. The correct answer emphasizes the decreasing order of ODP: CFCs > HCFCs > HFCs. Likely wrong answer: HFCs generally have higher ODP than HCFCs, and HCFCs have higher ODP than CFCs

Why this matters

ODP comparisons are relative: CFCs are highest, HCFCs are lower but still ozone-depleting, and HFCs have zero ODP. Do not mix ODP with GWP.

Objective/domain: Core

Source: EPA Section 608 Technician Certification Test Topics

Question 2 When recovering refrigerant from a low-pressure system, what is the primary benefit of recovering the liquid refrigerant first?

Answer choices

  1. A. Recovering vapor first ensures a complete system purge
  2. B. Liquid recovery is only necessary for systems over 15 pounds
  3. C. Vapor recovery minimizes the risk of compressor damage
  4. D. Recovering liquid at the beginning speeds recovery

Correct answer

Recovering liquid at the beginning speeds recovery

Objective/domain: Type III

Source: EPA Section 608 Technician Certification Test Topics

Question 3 During the evacuation of a post-1993 high-pressure appliance with a full charge of less than 200 pounds, what vacuum level is required to ensure proper refrigerant removal?

Answer choices

  1. A. 0 inches Hg vacuum
  2. B. 10 inches Hg vacuum
  3. C. 25 inches Hg vacuum
  4. D. 50 inches Hg vacuum

Correct answer

0 inches Hg vacuum

Objective/domain: Type II

Source: EPA Stationary Refrigeration Service Practice Requirements

Question 4 When servicing an appliance with multiple, independent refrigerant circuits, how are they handled for EPA 608 reporting purposes?

Answer choices

  1. A. The entire appliance is considered a single refrigerant circuit.
  2. B. Each independent circuit is treated as a separate appliance
  3. C. Only the largest circuit is reported for refrigerant recovery.
  4. D. Circuits are combined and reported as a total system charge.

Correct answer

Each independent circuit is treated as a separate appliance

Objective/domain: Type I

Source: EPA Definitions of Section 608 Terms

Question 5 A technician is returning recovered refrigerant to a system owned by the same customer. According to EPA regulations, what condition is required for this return without first undergoing reclamation?

Answer choices

  1. A. When it is sold to any certified technician.
  2. B. When it is transferred to a different owner after filtering.
  3. C. When it is mixed with new refrigerant before resale.
  4. D. Recovered or recycled refrigerant can return to the same owner systems without being reclaimed

Correct answer

Recovered or recycled refrigerant can return to the same owner systems without being reclaimed

Objective/domain: Core

Source: EPA Stationary Refrigeration Refrigerant Reclamation Requirements

Question 6 What is the primary purpose of a purge unit in an HVAC system?

Answer choices

  1. A. A purge unit removes noncondensables from a low-pressure system
  2. B. A purge unit is used to add refrigerant to a high-pressure system.
  3. C. A purge unit is used to measure refrigerant flow rates.
  4. D. A purge unit is used to filter moisture from liquid refrigerant.

Correct answer

A purge unit removes noncondensables from a low-pressure system

Objective/domain: Type III

Source: EPA Section 608 Technician Certification Test Topics

Question 7 A Type I refrigerant recovery technician is diagnosing a system and suspects the presence of noncondensables. Which diagnostic technique would most effectively confirm this suspicion based on EPA 608 guidelines?

Answer choices

  1. A. Analyzing oil composition provides insight into refrigerant contamination
  2. B. Measuring suction line temperature directly indicates noncondensable presence
  3. C. Pressure-temperature checks can reveal noncondensables in the refrigerant circuit
  4. D. Checking compressor windings verifies proper electrical operation

Correct answer

Pressure-temperature checks can reveal noncondensables in the refrigerant circuit

Objective/domain: Type I

Source: EPA Section 608 Technician Certification Test Topics

Question 8 An owner or operator discovers an appliance with a full charge of 50 or more pounds is leaking ozone-depleting refrigerant above the trigger rate. What is required?

Answer choices

  1. A. The owner or operator must take corrective action
  2. B. The leak must be reported to the EPA immediately.
  3. C. The appliance can continue to operate until the next scheduled maintenance.
  4. D. A certified technician must repair the leak within 24 hours.

Correct answer

The owner or operator must take corrective action

Objective/domain: Type II

Source: EPA Stationary Refrigeration Leak Repair Requirements

Question 9 Which organizations are authorized by the EPA to certify refrigerant recovery and recycling equipment, ensuring compliance with established standards?

Answer choices

  1. A. DOT certifies refrigerant recovery equipment
  2. B. ASHRAE certifies refrigerant recycling equipment
  3. C. EPA certifies refrigerant recovery equipment
  4. D. AHRI and UL certify recovery and recycling equipment

Correct answer

AHRI and UL certify recovery and recycling equipment

Objective/domain: Core

Source: EPA Refrigerant Recovery and Recycling Equipment Certification

Question 10 For low-pressure leak-test pressurization, what is the EPA's preferred method for achieving the required pressure?

Answer choices

  1. A. Controlled hot water or built-in pressurization
  2. B. Nitrogen pressurization as the first choice
  3. C. Vacuum pump pressure forcing
  4. D. Heat lamps on refrigerant lines

Correct answer

Controlled hot water or built-in pressurization

Objective/domain: Type III

Source: EPA Section 608 Technician Certification Test Topics

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