2.8 - Current and Historical Regulation Comparison

Regulatory verification date: August 6, 2026
Primary authorities: Current 40 CFR Parts 19, 82, and 84; current U.S. Environmental Protection Agency Section 608 and AIM Act guidance; and applicable Federal Register final rules
Course role: Distinguishes current field-practice requirements from historical rules, legacy study-guide facts, and provider-specific examination procedures

Learning Objectives

After completing this section, a student should be able to:

1. Compare historical and current Section 608 leak-repair trigger rates.
2. Explain how the refrigerant-sales restriction changed on January 1, 2018.
3. Distinguish historical penalty figures from current inflation-adjusted statutory maximums.
4. Interpret ARI and AHRI terminology correctly.
5. Select the applicable recovery-equipment standard from the equipment manufacture or import date.
6. Distinguish Clean Air Act Section 608 requirements from separate AIM Act requirements.
7. Classify a statement as current, historical, scheduled, proposed, provider-specific, or a stable technical concept.
8. Resolve conflicts among current regulations, EPA guidance, and older study guides.

Introduction

EPA Section 608 study materials have been published for more than three decades. Some older statements remain valid, but many regulatory numbers and scopes have changed.

Common legacy statements include:

• Commercial refrigeration and industrial process refrigeration use a 35 percent leak-repair trigger.
• Comfort cooling uses a 15 percent trigger.
• HFC refrigerant may be purchased without certification.
• A violation can result in a fixed $25,000, $27,500, $32,500, or $37,500 per-day penalty.
• All recovery equipment is tested under an ARI standard.
• Section 608 is the only federal refrigerant-management program that matters for HFC systems.

These statements may describe a historical period, but they do not fully describe current field practice.

Source-control rule: Current eCFR text and current EPA guidance control current field practice. Historical rules and older study guides must be identified by date and must not silently replace the current rule.

Older sources are still useful for:

• Stable refrigeration principles.
• Historical examination language.
• Understanding regulatory development.
• Recognizing older terminology incorporated into current regulations.
• Practicing careful reading of dated questions.

How to Read This Section

The following labels are used throughout this file:

Source Hierarchy for Regulatory Verification

When sources conflict, use this order:

1. Current eCFR text for the applicable section.
2. Current EPA program guidance.
3. The Federal Register final rule and preamble when regulatory history is needed.
4. The specific standard incorporated by reference.
5. Current EPA-approved certifying-provider information for examination administration.
6. Current project materials after verification.
7. Older study guides and textbooks for historical context and stable principles.

Do not:

• Treat an undated web summary as controlling authority.
• Treat a proposed rule as final.
• Use one enforcement settlement as a universal penalty schedule.
• Replace a standard incorporated by regulation with a newer edition without checking the CFR.
• Change a correct current answer merely to match an old answer key.

Historical and Current Leak-Repair Trigger Rates

1. Meaning of a Trigger Rate

A leak-repair trigger rate is the annualized percentage of an appliance’s full refrigerant charge that activates the applicable repair, verification, inspection, retrofit, retirement, recordkeeping, or reporting requirements.

A trigger rate is not:

• Permission to vent that percentage.
• A recommended leakage level.
• A universal requirement for every appliance.
• A substitute for preventive maintenance.

The applicable rate depends on:

• The regulatory program.
• Refrigerant type.
• Full charge.
• Appliance category.
• Date of the rule.
• Applicable exclusions.

2. Historical Section 608 Rates Before January 1, 2019

Historical rule — applicable before January 1, 2019

The previous Section 608 provisions applied to qualifying appliances containing Class I or Class II ozone-depleting refrigerants.

These are the source of the familiar legacy memory aid:

Commercial refrigeration: 35%
Industrial process refrigeration: 35%
Comfort cooling: 15%

Those values are historical, not current.

3. Current Section 608 Rates

Current rule

Current 40 CFR § 82.157 applies to appliances with a full charge of 50 pounds or more of:

• A Class I refrigerant.
• A Class II refrigerant.
• A blend containing a Class I or Class II refrigerant.

Current Section 608 rates are:

Current § 82.157 does not apply to appliances containing solely substitute refrigerants.

4. Why the Section 608 Rates Changed

The 2016 refrigerant-management rule established lower trigger rates effective January 1, 2019:

• Commercial refrigeration: 35% to 20%.
• Industrial process refrigeration: 35% to 30%.
• Comfort cooling: 15% to 10%.
• Other qualifying appliances: 10%.

The 2016 rule also extended leak-repair provisions to non-exempt substitutes. The 2020 rule later removed substitute-only appliances from § 82.157 while retaining the lower ODS rates.

Therefore:

The current Section 608 rates are 30%, 20%, and 10%, but current Section 608 leak repair applies to qualifying ODS appliances rather than substitute-only appliances.

5. Current AIM Act Rates Beginning January 1, 2026

Current rule

Separate requirements in 40 CFR § 84.106 apply beginning January 1, 2026 to refrigerant-containing appliances with a full charge of 15 pounds or more when the refrigerant contains:

• An HFC regulated under the AIM Act.
• A substitute for an HFC with a GWP greater than 53.

Current AIM Act rates are:

The AIM Act leak-repair provision excludes:

• Appliances containing solely an ozone-depleting refrigerant.
• Appliances in the residential and light-commercial air-conditioning and heat-pump subsector.

6. Leak-Repair Comparison

Similar percentages do not make the two current programs interchangeable.

Historical and Current Refrigerant-Sales Restrictions

1. Historical Pre-2018 Scope

Historical rule — before January 1, 2018

The federal refrigerant-sales restriction focused principally on:

• Class I ozone-depleting refrigerants.
• Class II ozone-depleting refrigerants.
• Blends containing those substances.

Older study guides may state that HFC refrigerants could be purchased without Section 608 certification. That statement describes the earlier rule.

2. Current Scope

Current rule

Starting January 1, 2018, the sales restriction covers:

• Class I refrigerants.
• Class II refrigerants.
• Non-exempt substitute refrigerants, including common HFCs.
• Blends containing covered refrigerants.

Allowed purchase pathways include:

• Section 608 certified technicians for stationary-equipment refrigerant.
• Section 609 certified technicians for refrigerant acceptable for MVAC use.
• Employers or authorized representatives with proof of a current certified technician.
• Lawful resale purchasers.
• Appliance manufacturers.
• The limited small-can MVAC exception.

The small-can exception applies when:

• The refrigerant is a non-exempt substitute intended for MVAC use.
• The container is designed to hold two pounds or less.
• The container has the required unique fitting.
• The applicable self-sealing-valve requirement is satisfied.

3. Pre-2018 Certification Cards Remain Valid

Current rule

A valid Section 608 certification card issued before January 1, 2018 does not need to be replaced merely because the older wording referred mainly to CFCs and HCFCs.

The technician must still comply with:

• Current purchasing rules.
• The scope of the certification type.
• Current service practices.
• Honest use of the credential.

4. The 2020 Leak-Repair Revision Did Not Cancel the Sales Restriction

Current rule

The 2020 rule removed substitute-only appliances from the federal Section 608 leak-repair requirements.

It did not generally remove:

• The sales restriction for non-exempt substitutes.
• Technician-certification requirements for covered work.
• The venting prohibition for non-exempt substitutes.
• Recovery-equipment and retained service-practice requirements.

A change to one Section 608 provision must not be applied automatically to every other provision.

5. Sales-Rule Comparison

Historical and Current Penalty Figures

1. Why Penalty Figures Change

Clean Air Act civil monetary penalties are adjusted for inflation.

The applicable maximum depends on:

• Statutory provision.
• Date of violation.
• Date of assessment.
• Administrative or judicial pathway.
• Per-day treatment.
• Any action-level ceiling.

A number printed in an older study guide can be historically accurate without being current.

2. Historical Judicial Maximums Commonly Found in Study Guides

This explains why different generations of practice questions use different figures.

3. Current Statutory Maximums

Current rule

The current 40 CFR § 19.4 table lists the following values for qualifying violations occurring after November 2, 2015 when assessed on or after January 8, 2025:

These are statutory maximums, not automatic fines.

Actual enforcement outcomes depend on the facts, including:

• Number and duration of violations.
• Environmental harm.
• Economic benefit.
• Cooperation.
• Compliance history.
• Ability to pay.
• Injunctive relief.
• Settlement terms.
• Applicable enforcement authority.

4. Handling Penalty Questions

For general EPA 608 preparation, the safest stable lesson is:

Violations can result in substantial penalties assessed per day per violation, and the current amount must be verified.

ARI and AHRI Terminology

1. Organization Names

Historical name

ARI — Air-Conditioning and Refrigeration Institute

Current name

AHRI — Air-Conditioning, Heating, and Refrigeration Institute

ARI and the Gas Appliance Manufacturers Association combined in 2008 to form AHRI.

2. Historical Standards Keep Their Original Names

Correct designations include:

• ARI Standard 740-1993.
• ARI Standard 740-1995.
• AHRI Standard 740-2016.

Do not rewrite them as:

• AHRI Standard 740-1993.
• AHRI Standard 740-1995.
• ARI Standard 740-2016.

The organization changed its name, but a historical standard is not renamed retroactively.

3. Current Regulatory Interpretation

Current rule

Current 40 CFR § 82.158 correctly refers to:

• ARI Standard 740-1993 for one equipment-manufacture period.
• ARI Standard 740-1995 for a later period.
• AHRI Standard 740-2016 for equipment manufactured or imported on or after January 1, 2017.

Seeing “ARI” in the current CFR does not necessarily mean that the CFR is outdated. The regulation may be identifying the historical standard accurately.

Recovery-Equipment Dates and Standards

1. Which Date Controls?

The applicable certification standard is generally determined by when the recovery or recycling equipment was manufactured or imported.

It is not determined by:

• Appliance manufacture date.
• Date the technician purchased the recovery machine.
• Date of the service call.
• Refrigerant production date.
• Technician-certification date.

2. Current Standard Timeline

Current rule

For recovery or recycling equipment intended for appliances other than small appliances, MVACs, and MVAC-like appliances:

3. Older Equipment Is Not Automatically Illegal

A recovery machine is not automatically prohibited because it was manufactured before a newer standard date.

It must:

• Fit the applicable date category.
• Meet the applicable certification or performance requirement.
• Be suitable for the refrigerant and appliance.
• Achieve the required evacuation level.
• Be used according to manufacturer instructions.
• Remain in safe operating condition.

4. Equipment Certification and Appliance Evacuation Are Different

Do not confuse:

• The standard used to certify the recovery machine.
• The evacuation level required before an appliance is opened or disposed of.

A certified machine can still be used incorrectly. A technician can violate the required service practice even when the machine itself is properly certified.

5. Small-Appliance Historical Date

Current rule

For small-appliance recovery:

• Equipment manufactured before November 15, 1993 is associated with the historical 80-percent pathway or the applicable vacuum option.
• Equipment manufactured on or after November 15, 1993 is associated with 90-percent recovery when the compressor operates, 80-percent when it does not, or the applicable vacuum option.

The detailed Type I recovery procedures are developed later in the course.

Section 608 and AIM Act Requirements

1. Separate Legal Authorities

Current rule

The AIM Act is not a renamed version of Section 608.

2. Current Leak-Repair Applicability

Current rule

3. Technician Certification Under the AIM Act

Current rule

Technicians already certified under Section 608 or Section 609 do not need a new certification solely because the AIM Act Emissions Reduction and Reclamation requirements became applicable.

The technician must still:

• Hold the certification applicable to the work.
• Follow AIM Act requirements when they apply.
• Distinguish stationary equipment from MVAC work.
• Follow refrigerant-specific safety and code requirements.

4. Automatic Leak Detection

Current rule

40 CFR § 84.108 requires automatic leak detection for specified industrial process refrigeration and commercial refrigeration appliances with a full charge of 1,500 pounds or more of covered refrigerant.

Compliance dates include:

• Covered appliances installed on or after January 1, 2026: system required upon installation or within 30 days.
• Covered appliances installed on or after January 1, 2017 and before January 1, 2026: system required by January 1, 2027.

Section 608 allows automatic leak detection to support some leak-inspection compliance, but it does not impose the same general 1,500-pound installation requirement.

5. Other AIM Act Programs

The AIM Act also addresses:

• HFC production and consumption phasedown.
• Technology Transitions restrictions.
• Emissions Reduction and Reclamation.
• Reclaimed-refrigerant requirements.
• Container tracking and reporting.
• Fire-suppression provisions.

These are current field-practice requirements when applicable, but they are separate from the traditional Section 608 examination framework.

Legacy Examination Topics and Current Field Practice

1. Stable EPA 608 Concepts

The following principles remain central:

• Do not intentionally vent covered refrigerant.
• Recover before opening or disposal.
• Use suitable certified recovery equipment.
• Match certification type to the appliance.
• Distinguish recover, recycle, and reclaim.
• Verify refrigerant-purchase authority.
• Keep required records.
• Follow the current regulation when rules change.

2. Legacy Study-Guide Facts

The following may appear in older books or question banks:

• 35% commercial-refrigeration trigger.
• 35% industrial-process-refrigeration trigger.
• 15% comfort-cooling trigger.
• HFC refrigerant sales without certification.
• $25,000 to $37,500 per-day penalty figures.
• ARI terminology without AHRI explanation.
• Pre-1993 recovery-equipment wording.
• The statement that Section 608 is the only federal HFC-management program.

These must be labeled historical.

3. Current Section 608 Field-Practice Updates

Current rules

• 30%, 20%, and 10% ODS leak-repair triggers.
• § 82.157 applies only to qualifying ODS appliances.
• Sales restriction includes non-exempt substitutes.
• Current penalty table controls.
• AHRI Standard 740-2016 applies to the specified newer equipment category.
• Current eCFR definitions, exemptions, and records control.

4. Current AIM Act Field-Practice Updates

Current rules

• Leak repair applies beginning January 1, 2026 to qualifying 15-pound-or-more appliances.
• HFC and qualifying substitute scope differs from Section 608.
• Residential/light-commercial AC and heat-pump subsector is excluded from § 84.106.
• Automatic leak detection applies to specified 1,500-pound-or-more appliances.
• Separate records and reports may be required.

5. Handling a Dated Question

6. Examination Preparation Versus Field Practice

This project will:

• Teach current rules as current.
• Label historical values.
• Preserve stable examination concepts.
• Explain terminology still found in older questions.
• Identify outdated answer keys.
• Avoid changing a correct current answer to match a legacy key.

Provider-specific scoring, time limits, retake procedures, and examination administration must be verified with the selected EPA-approved organization.

Technical and Regulatory Details

1. Verification-Date Rule

For every current regulation:

1. Record the verification date.
2. Cite the current EPA or eCFR source.
3. Identify the applicable CFR section.
4. Separate current, historical, scheduled, and proposed rules.
5. Recheck date-sensitive values before reuse.
6. Update related quick-reference and answer files when a rule changes.

2. Proposed Rules

A proposed rule is not a current requirement.

Do not:

• Teach a proposed exemption as final.
• Remove a current duty based on a proposal.
• Use a press release instead of the current eCFR.
• Change an answer key before a final rule becomes effective.

3. Incorporated Standards

When a regulation incorporates a standard:

• Use the edition named in the regulation.
• Do not automatically substitute the newest commercial edition.
• Preserve the historical designation.
• Check whether separate flammable-refrigerant provisions apply.
• Distinguish equipment certification from technician service requirements.

4. Multiple Regulatory Programs Can Apply

An appliance may require review under more than one program.

Examples include:

• Section 608 certification and venting rules plus AIM Act leak repair.
• Section 608 sales restrictions plus AIM Act Technology Transitions.
• Section 608 recovery rules plus state fire or mechanical codes.
• Section 609 MVAC service rules plus AIM Act HFC-management requirements.

Identifying one applicable program does not end the compliance review.

Important Terms

Current Rule

A current rule is a requirement in effect on the stated verification date.

Historical Rule

A historical rule applied during a previous period but is not the controlling current requirement.

Incorporated by Reference

A standard is incorporated by reference when a regulation legally adopts a specified external standard or edition.

Legacy Study-Guide Fact

A legacy study-guide fact is older information that remains useful for historical context but must not be treated as current without verification.

Proposed Rule

A proposed rule is an agency proposal that has not become a final effective requirement.

Scheduled Rule

A scheduled rule is a finalized requirement with a future compliance date.

Statutory Maximum

A statutory maximum is the highest penalty authorized by the applicable law and adjustment table. It is not an automatic penalty.

Verification Date

A verification date records when a current regulatory statement was checked against authoritative sources.

EPA 608 Exam Focus

What Students Must Remember

• Historical rates were 35% for commercial refrigeration, 35% for industrial process refrigeration, and 15% for comfort cooling.
• Current Section 608 rates are 30%, 20%, and 10%.
• Current Section 608 leak repair applies to qualifying 50-pound-or-more ODS appliances.
• Current AIM Act leak repair applies to qualifying 15-pound-or-more HFC or qualifying-substitute appliances.
• The two programs use similar rates but different applicability.
• The sales restriction was extended to non-exempt substitutes on January 1, 2018.
• Valid pre-2018 Section 608 cards remain valid.
• The 2020 rule did not cancel the substitute-refrigerant sales restriction.
• Current penalties must be verified in 40 CFR § 19.4.
• ARI is the historical organization name; AHRI is the current name.
• Historical ARI standards retain the ARI designation.
• AHRI Standard 740-2016 applies to the specified post-2016 recovery-equipment category.
• The recovery-machine manufacture or import date determines the applicable standard.
• Older recovery equipment is not automatically illegal.
• A proposed rule is not a current requirement.
• Use the rule for the date specified in the question.

Typical Exam Question Patterns

Students may be asked to:

• Select a historical leak rate.
• Select a current Section 608 leak rate.
• Distinguish the 50-pound Section 608 threshold from the 15-pound AIM Act threshold.
• Identify the January 1, 2018 sales-rule change.
• Determine whether an older certification card remains valid.
• Explain why a $37,500 figure may be outdated.
• Distinguish ARI from AHRI.
• Match a recovery-machine date with ARI 740-1993, ARI 740-1995, or AHRI 740-2016.
• Distinguish equipment certification from service evacuation.
• Determine whether Section 608, the AIM Act, or both should be reviewed.
• Identify a proposed rule as nonbinding.
• Recognize a legacy question with an outdated key.

High-Priority Current-versus-Legacy Summary

Common Mistakes and Confusing Points

Mistake 1: Memorizing a Leak Rate Without Identifying the Program

Current Section 608 and AIM Act rules use similar percentages but have different refrigerant and charge thresholds.

Mistake 2: Treating 35% and 15% as Current Rates

They are historical Section 608 rates.

Mistake 3: Assuming the 2020 Rule Restored Unrestricted HFC Sales

It did not.

Mistake 4: Assuming Every Pre-2018 Certification Card Must Be Replaced

Valid older cards remain valid.

Mistake 5: Renaming ARI 740-1993 as AHRI 740-1993

Historical standards retain their original designation.

Mistake 6: Selecting the Recovery Standard From the Service Date

Use the equipment manufacture or import date.

Mistake 7: Assuming Older Recovery Equipment Must Be Discarded

It may remain usable when it satisfies the applicable requirements.

Mistake 8: Treating the Current Maximum Penalty as an Automatic Fine

The statutory maximum defines legal exposure, not the automatic assessment.

Mistake 9: Treating a Proposed Rule as Current

The current eCFR controls until a final rule becomes effective.

Mistake 10: Assuming the AIM Act Replaced Section 608

The programs coexist.

Mistake 11: Assuming Residential Equipment Is Exempt From All Refrigerant Rules

The AIM Act leak-repair exclusion does not remove Section 608 certification, venting, recovery, sales, safety, or other applicable requirements.

Mistake 12: Changing a Correct Current Answer to Match an Old Practice Key

Label and correct the legacy key instead.

Concept-Check Questions

Question 1

Which trigger rate applies under the current Section 608 rule to a qualifying commercial refrigeration appliance containing 50 pounds or more of ozone-depleting refrigerant?

A. 10%

B. 15%

C. 20%

D. 35%

Question 2

Which statement correctly compares current Section 608 and AIM Act leak-repair requirements?

A. Both apply only to appliances containing 50 pounds or more of CFC or HCFC refrigerant.

B. Section 608 applies to qualifying 50-pound-or-more ODS appliances, while the AIM Act can apply to qualifying 15-pound-or-more appliances containing HFCs or certain substitutes.

C. The AIM Act completely replaced Section 608 on January 1, 2026.

D. Section 608 applies only to residential systems, while the AIM Act applies only to MVACs.

Question 3

What major change occurred to the federal refrigerant-sales restriction on January 1, 2018?

A. It was eliminated for all refrigerants.

B. It was limited to R-22.

C. It was extended to non-exempt substitute refrigerants such as common HFCs.

D. It required replacement of every older certification card.

Question 4

Which standard name is correct for recovery equipment manufactured or imported on or after September 22, 2003 and before January 1, 2017?

A. AHRI Standard 740-1993

B. ARI Standard 740-1995

C. AHRI Standard 740-2016

D. ARI Standard 700-2019

Question 5

Why can a $37,500-per-day statement in an older study guide be misleading?

A. Section 608 violations no longer permit civil penalties.

B. Penalty maximums are inflation adjusted and depend on the statutory authority and enforcement pathway.

C. Every current violation has a fixed $37,500 total penalty.

D. Refrigerant manufacturers select penalty amounts.

Question 6

Which factor determines the applicable recovery-equipment certification standard under 40 CFR § 82.158?

A. Date the appliance was installed

B. Date the technician passed the examination

C. Date the recovery or recycling equipment was manufactured or imported

D. Date the refrigerant cylinder was filled

Question 7

Which statement about ARI and AHRI terminology is correct?

A. Every historical ARI standard must be renamed as an AHRI standard.

B. ARI and AHRI are unrelated organizations.

C. AHRI is the current organization name, but historical standards such as ARI 740-1993 retain their original designation.

D. AHRI terminology applies only to MVAC equipment.

Question 8

An old practice question lists 35 percent as the commercial-refrigeration leak rate without giving a date. What is the best project response?

A. Teach 35 percent as the current rate to match the old key.

B. Delete all discussion of leak rates.

C. Label 35 percent as historical and teach the current 20-percent rule with its applicability and verification date.

D. Average the historical and current rates.

Answers and detailed explanations will be provided in 2.11 - Answers and Explanations.md.

Section Summary

Older EPA 608 materials must be read in context.

Historical Section 608 trigger rates included:

• 35% for commercial refrigeration.
• 35% for industrial process refrigeration.
• 15% for comfort cooling.

Current Section 608 trigger rates are:

• 30% for industrial process refrigeration.
• 20% for commercial refrigeration.
• 10% for comfort cooling and other qualifying appliances.

Current Section 608 leak repair applies to qualifying appliances with 50 pounds or more of ODS refrigerant. Beginning January 1, 2026, separate AIM Act leak-repair provisions apply to qualifying appliances containing 15 pounds or more of HFC or certain substitutes.

The refrigerant-sales restriction was extended to non-exempt substitutes on January 1, 2018. Valid older certification cards remain valid, and the 2020 leak-repair revision did not cancel the substitute-refrigerant sales restriction.

ARI is the historical organization name. AHRI is the current name. Historical standards retain their original ARI designation.

Recovery-equipment standards depend on the equipment manufacture or import date:

• Before November 15, 1993.
• November 15, 1993 through September 21, 2003.
• September 22, 2003 through December 31, 2016.
• January 1, 2017 and later.

Penalty amounts are date-sensitive. Older amounts explain legacy questions but do not control current practice.

This project will:

• Teach current rules as current.
• Label historical rules.
• Separate scheduled and proposed rules.
• Preserve stable examination concepts.
• Record verification dates.
• Use current EPA and eCFR sources as controlling authorities.

References

Current Section 608 Sources

1. U.S. Environmental Protection Agency, Stationary Refrigeration Leak Repair Requirements, verified August 6, 2026.

2. Electronic Code of Federal Regulations, 40 CFR § 82.157 — Appliance Maintenance and Leak Repair, verified August 6, 2026.

3. Electronic Code of Federal Regulations, 40 CFR § 82.156 — Proper Evacuation of Refrigerant From Appliances, verified August 6, 2026.

4. Electronic Code of Federal Regulations, 40 CFR § 82.158 — Standards for Recovery and Recycling Equipment, verified August 6, 2026.

5. U.S. Environmental Protection Agency, Refrigerant Sales Restriction, verified August 6, 2026.

6. U.S. Environmental Protection Agency, Questions and Answers About the Refrigerant Sales Restriction, verified August 6, 2026.

7. U.S. Environmental Protection Agency, Section 608 and Section 609 Overlap, verified August 6, 2026.

AIM Act Sources

8. Electronic Code of Federal Regulations, 40 CFR § 84.106 — Leak Repair, verified August 6, 2026.

9. Electronic Code of Federal Regulations, 40 CFR § 84.108 — Automatic Leak Detection Systems, verified August 6, 2026.

10. Electronic Code of Federal Regulations, 40 CFR Part 84, Subpart C — Management of Regulated Substances and Substitutes, verified August 6, 2026.

11. U.S. Environmental Protection Agency, AIM Act Leak Repair Requirements for Appliances Containing HFCs and Certain Substitutes, January 2026 and verified August 6, 2026.

Penalty and Regulatory-History Sources

12. Electronic Code of Federal Regulations, 40 CFR § 19.4 — Statutory Civil Monetary Penalties, verified August 6, 2026.

13. U.S. Environmental Protection Agency, 2016 Refrigerant Management Final Rule, historical and current regulatory-history source.

14. U.S. Environmental Protection Agency, 2020 Revisions to the Refrigerant Management Program’s Extension to Substitutes, historical final rule.

15. U.S. Environmental Protection Agency, 2024 AIM Act Emissions Reduction and Reclamation Final Rule, current regulatory-history source verified August 6, 2026.

Industry-Terminology Source

16. Air-Conditioning, Heating, and Refrigeration Institute, AHRI Standard 740 — Performance Rating of Refrigerant Recovery Equipment and Recovery/Recycling Equipment, accessed August 6, 2026.