U.S. Refrigerant Regulations
Understand the U.S. HFC phasedown, EPA Technology Transitions, SNAP refrigerant listings, Section 608 requirements and the major HVAC/R compliance milestones shaping refrigerant selection from 2025 through 2036.
Four EPA programs answer four different questions
U.S. refrigerant compliance cannot be reduced to one GWP number. Supply, new equipment, substitute acceptability and service practices are governed through different federal programs.
AIM Act HFC Phasedown
EPA uses an allowance program to reduce U.S. HFC production and consumption in statutory steps. The current 2024–2028 cap is 60% of baseline, moving to 30% for 2029–2033.
Technology Transitions
Sector- and subsector-specific rules restrict higher-GWP HFC use in new products and new field-assembled systems. Dates can differ for manufacture/import and installation.
SNAP
The Significant New Alternatives Policy program evaluates substitutes by specific end use. A refrigerant can be acceptable, acceptable subject to use conditions, or unacceptable for a particular application.
Clean Air Act Section 608
Section 608 establishes refrigerant management requirements for stationary refrigeration and air conditioning, including technician certification and recovery-related obligations.
Selected U.S. HVAC/R GWP limits and compliance dates
EPA's current tables distinguish self-contained products from field-assembled systems. The examples below focus on high-value HVAC/R system transitions and selected product dates.
| Sector / Subsector | EPA GWP Limit | Key Compliance Date | How to Read It |
|---|---|---|---|
| Residential & light-commercial AC / heat pumps — self-contained products | 700 | Jan 1, 2025 | Manufacture and import compliance date for products such as window and portable room AC equipment. |
| Residential & light-commercial AC / heat-pump systems | 700 | Jan 1, 2025 | New field-assembled systems. Current EPA reconsideration provisions treat systems differently when all specified components were manufactured/imported before Jan 1, 2025. |
| Variable refrigerant flow (VRF) systems | 700 | Jan 1, 2027 | Installation compliance date. EPA provides specific transitional provisions for components manufactured/imported before Jan 1, 2026 and certain previously permitted projects. |
| Comfort cooling chillers | 700 | Jan 1, 2025 | Applies to the current EPA product/system transition for comfort-cooling chillers. |
| Industrial process refrigeration — ≥200 lb, above −30 °C evaporator-entry condition | 150 | Jan 1, 2026 | Selected non-chiller IPR system category; temperature, charge and configuration determine the applicable row. |
| Industrial process refrigeration — <200 lb, above −30 °C evaporator-entry condition | 300 | Jan 1, 2026 | Selected non-chiller IPR category; additional exclusions and later dates apply to other IPR configurations. |
| Cold storage warehouses | 700 → 150 / 300 By charge size / configuration | Jul 27, 2026 → Jan 1, 2032 | Interim 700 limit begins in 2026. In 2032 the applicable limit becomes 150 or 300. |
| Retail food — remote condensing units | 1,400 → 150 / 300 By charge size / configuration | Jul 27, 2026 → Jan 1, 2032 | Interim 1,400 limit begins in 2026 before the tighter 2032 stage. |
| Retail food — supermarket systems | 1,400 → 150 / 300 By charge size / configuration | Jan 1, 2027 → Jan 1, 2032 | Interim 1,400 limit begins in 2027; 150 or 300 applies from 2032 depending on charge/configuration. |
For compliance decisions, use the current regulatory text in 40 CFR Part 84, Subpart B and the applicable reconsideration or transition provisions for the exact product/system category.
New-equipment restrictions and existing-system service are not the same rule
This distinction is essential when discussing R410A and other higher-GWP refrigerants already operating in U.S. equipment.
Start with Technology Transitions
For a new product or system, identify the EPA subsector first, then verify the applicable GWP limit, date and transition provisions.
- Product manufacture and import compliance date
- New-system installation compliance date
- Technology Transitions GWP limit
- SNAP listing and use conditions
- Equipment listing and manufacturer approval
- Applicable safety, mechanical, fire and building codes
Start with service and refrigerant-management rules
Equipment already in operation has a different regulatory question from the design of a new system. Components used to repair existing systems are not treated as new-system installations under the Technology Transitions systems table.
- Section 608 technician certification
- Refrigerant recovery and venting prohibition
- ER&R leak-repair requirements where applicable
- Reclamation requirements and future reclaimed-HFC servicing rules
- Manufacturer-approved service refrigerant and components
- State and local requirements
Restrictions affecting new higher-GWP HVAC products and systems do not automatically require existing R410A equipment to be immediately replaced. Existing-system servicing remains subject to the applicable service, refrigerant-management and manufacturer requirements.
Key federal milestones from 2025 to 2036
This is a planning timeline, not a substitute for the complete EPA sector tables. Individual equipment categories can have different definitions, exceptions and transition provisions.
What the U.S. framework means for five major refrigerants
These cards describe regulatory positioning, not universal equipment approval. Always verify the exact end use, SNAP listing, equipment design and current code.
R410A is above the 700 GWP limit used in major new residential/light-commercial HVAC transitions. That drives new equipment toward lower-GWP platforms, but it does not mean the installed base disappears immediately.
Explore R410A →R32 is below the Technology Transitions 700 GWP limit and is listed by SNAP for new residential/light-commercial AC and heat-pump use subject to use conditions.
Explore R32 →R454B is another major sub-700 HVAC route. SNAP lists it for relevant new residential/light-commercial AC and heat-pump applications subject to use conditions.
Explore R454B →R290's very low GWP does not create universal U.S. HVAC acceptability. In EPA's residential/light-commercial SNAP table, its listing is application-specific, including self-contained room air conditioning with use conditions.
Explore R290 →R744 offers a very low direct GWP route in suitable applications, especially refrigeration, but its higher operating pressures require dedicated system architecture and pressure-rated components.
Explore R744 →Technician certification and stationary HVAC/R service
EPA Section 608 requires technicians who maintain, service, repair or dispose of equipment that could release refrigerant to hold the appropriate EPA-approved certification. EPA states that Section 608 technician certification credentials do not expire.
HFC management now extends beyond traditional Section 608 topics
EPA's AIM Act Emissions Reduction and Reclamation program adds requirements for certain HFC-containing equipment and reclaimed refrigerants.
- Selected ≥15 lb appliances enter HFC leak-repair/reporting requirements from 2026; exclusions apply.
- Reclaimed HFC refrigerant is subject to a new standard from January 1, 2026.
- Reclaimed HFC servicing requirements begin in 2029 for supermarket systems, refrigerated transport and automatic commercial ice makers where HFCs are used.
Use the regulation that matches the decision
A U.S. HVAC/R project normally requires several checks in sequence. Starting with the exact application prevents a single GWP number from becoming a false compliance shortcut.
Verify the current rule with primary sources
U.S. HFC rules have continued to change through final rules, reconsideration actions and implementation guidance. Use the current EPA page and regulatory text before making a compliance decision.
Verify current EPA rules, the exact equipment category, compliance date, manufacturer documentation, SNAP use conditions and state/local requirements for the specific project. Regulations and implementation guidance can change.
Planning HVAC/R equipment for the U.S. market?
Use the Refrigerant Finder to screen candidates, or discuss low-GWP transition, application fit, leak detection and OEM integration requirements.