AB 663 prohibits the sale or distribution in California of bulk hydrofluorocarbons (HFCs) and bulk blends that exceed staged global warming potential (GWP) limits: 2,200 beginning Jan 1, 2025; 1,500 beginning Jan 1, 2030; and 750 beginning Jan 1, 2033. The bill defines key terms (including a detailed definition of “certified reclaimed refrigerant”), allows narrow, time‑bounded exemptions for certain medical and ultra‑low temperature uses, and directs the state board to pursue sectoral rulemaking to require low or ultra‑low GWP alternatives where practicable.
The measure also bars using HFCs with GWP greater than 750 to service state‑owned stationary equipment beginning Jan 1, 2025 (with an exception for certified reclaimed refrigerants), and places enforcement tools and penalties under existing California air statutes with fines deposited into the Air Pollution Control Fund. This creates immediate compliance pressure for manufacturers, distributors, HVAC/refrigeration service providers, equipment owners, and the refrigerant reclamation industry while steering the market toward low‑GWP alternatives and reclaimed product.
At a Glance
What It Does
Sets phased numerical GWP caps on bulk HFCs sold or distributed in California (2,200 in 2025; 1,500 in 2030; 750 in 2033), exempts certified reclaimed refrigerant and narrowly timed uses, requires state board rulemaking to push low/ultra‑low GWP alternatives, and restricts servicing of state equipment to HFCs with GWP ≤ 750 (except reclaimed).
Who It Affects
Manufacturers and importers of bulk HFCs and blended refrigerants, chemical distributors, HVAC and refrigeration service providers, EPA‑certified refrigerant reclaimers, medical inhaler and ultra‑low‑temperature equipment users, and California state agencies that own stationary refrigeration equipment.
Why It Matters
The bill imposes firm, short‑to‑medium term market thresholds that will accelerate demand for reclaimed refrigerants and low‑GWP substitutes, force inventory and product reformulation decisions, and require new compliance practices (testing, documentation, and labeling) across the supply chain.
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What This Bill Actually Does
AB 663 creates a phased prohibition on bringing bulk hydrofluluorocarbon gases and bulk blends containing HFCs into commerce in California when those products exceed specified global warming potentials. The bill measures GWP using IPCC assessment values (AR4, with AR5 fallback or state board determination) and distinguishes between ‘new’ HFC product and 'certified reclaimed refrigerant' — the latter must be reclaimed by an EPA‑certified reclaimer, meet federal Appendix A quality specifications, and contain no more than 15% new HFC by weight, with supporting documentation.
The core prohibition applies to wholesale transactions of bulk product and to blended products measured by the blended GWP rather than the GWP of individual components; this means manufacturers and blenders must evaluate and certify blend GWPs. The statute also preserves the state board’s power to adopt stricter GWP ceilings by regulation, and it directs the state board to open rulemakings requiring low or ultra‑low GWP alternatives in specific sectors unless compliance is impracticable for participants.There are narrow exemptions: certified reclaimed refrigerants are always exempt, hydrofluorocarbons exclusively used in FDA‑approved metered dose inhalers are temporarily exempt until Dec 27, 2030, and HFCs for very low temperature refrigeration (<‑50°C) are exempt until Jan 1, 2028.
Separately, starting Jan 1, 2025, the state may not use HFCs with GWP above 750 to service leaks in state‑owned stationary equipment, though certified reclaimed refrigerants remain allowable for that purpose.Enforcement relies on California’s existing civil enforcement and penalty framework: violations can be enjoined and are subject to penalties under cited California code sections, with collected penalties directed to the Air Pollution Control Fund. The act includes a severability clause and ties several definitions to how federal regulations read on Oct 1, 2024, which effectively freezes reference points for terms like “bulk” and “regulated substance.”
The Five Things You Need to Know
Numeric phased caps on bulk HFCs: GWP ≤ 2,200 on Jan 1, 2025; ≤ 1,500 on Jan 1, 2030; ≤ 750 on Jan 1, 2033.
Certified reclaimed refrigerant exemption requires EPA‑certified reclaiming, testing per Appendix A of 40 CFR Part 82, and documentation showing the reclaimed product contains ≤15% new HFC by weight.
Temporary exemptions: HFCs exclusively for FDA‑approved metered dose inhalers are exempt until Dec 27, 2030; HFCs exclusively for very low temperature refrigeration (<‑50°C) are exempt until Jan 1, 2028.
State equipment servicing rule: from Jan 1, 2025, the state cannot replenish leaks or service state‑owned stationary equipment with HFCs having GWP > 750, though certified reclaimed refrigerants remain permitted.
Enforcement and funds: violations are subject to injunction and penalties under existing California air statutes; penalties collected go into the Air Pollution Control Fund, and the state board can adopt stricter GWP limits by regulation.
Section-by-Section Breakdown
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Definitions and reference‑dates for federal standards
This subsection fixes the operational vocabulary: it ties terms like “bulk” and “regulated substance” to specific provisions of Title 40 of the Code of Federal Regulations as they existed on Oct 1, 2024, and sets how GWP is measured (IPCC AR4 values, AR5 fallback). Practically, those reference dates lock in which federal definitions and appendix specifications apply, which matters for compliance testing, labeling, and which refrigerants are in‑scope.
Sale and distribution prohibitions with phased GWP ceilings
This is the bill’s operative ban: it prohibits offering for sale, distribution, or otherwise entering into commerce in California any bulk HFC or bulk blend exceeding the stated GWP ceilings on the listed dates. Because blended products are assessed by blended GWP (see subdivision (d)(2)), manufacturers and distributors must calculate and certify blended GWPs rather than rely on per‑component limits, shifting technical and recordkeeping burdens upstream.
State board authority to tighten standards
The statute expressly preserves and anticipates more stringent action: the state board may adopt regulations that set lower maximum GWPs than the statutory caps. That clause creates a two‑track compliance landscape where immediate statutory floors exist but regulators can accelerate or deepen reductions sectorally through rulemaking.
Exemptions — certified reclaimed refrigerant, MDIs, and very low temperature uses
Certified reclaimed refrigerant receives an ongoing exemption, but reclaimers must meet specific testing, certification, and documentation criteria (EPA‑certified reclaimer, Appendix A compliance, ≤15% new HFC by weight). The bill also creates temporary, narrowly tailored exemptions for metered dose inhalers (inoperative after Dec 27, 2030) and very low temperature refrigeration (inoperative after Jan 1, 2028). For blends, the blended GWP governs applicability; this forces blend formulators to compute aggregate GWP and maintain verification records.
Restriction on servicing state‑owned stationary equipment
Beginning Jan 1, 2025, the state cannot use HFCs with GWP > 750 to replenish leaks or service its stationary equipment, subject to the certified reclaimed refrigerant exception. For state procurement and facilities management, this creates immediate retrofit and maintenance implications and likely requires asset inventories, alternative refrigerant approvals, and contracting updates.
Directed rulemaking for sectoral transitions
The state board must initiate rulemaking to require low or ultra‑low GWP alternatives in a sector unless it is impracticable for that sector to comply. This gives the board a mechanism to impose sector‑specific phaseouts and compliance timelines, but the statutory ‘impracticable’ carve‑out leaves substantial discretion and will be a focal point in future regulations.
Enforcement, penalties, and fund allocation
Violations can be enjoined under Section 41513 and are subject to penalties referenced in Section 38580 and Article 3 of Chapter 4 of Part 4. The bill stipulates that penalty revenues go to the Air Pollution Control Fund, signaling that enforcement proceeds will support California’s air programs rather than general funds.
Severability
Standard severability language ensures that if one provision is invalidated by a court, the rest can remain effective. Given the bill’s reliance on federal reference dates and regulatory interaction, this clause preserves the remainder of the statute if portions are struck down.
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Explore Environment in Codify Search →Who Benefits and Who Bears the Cost
Every bill creates winners and losers. Here's who stands to gain and who bears the cost.
Who Benefits
- Manufacturers of low‑GWP and ultra‑low‑GWP refrigerants — they gain accelerated market demand as high‑GWP products are phased out and the state pushes alternatives through rulemaking.
- EPA‑certified refrigerant reclaimers — the statute explicitly prioritizes certified reclaimed refrigerant by exempting it and by allowing reclaimed product to serve state equipment, creating market preference for high‑quality reclamation and associated services (testing, documentation).
- California state agencies and climate regulators — the bill directly reduces the government’s operational reliance on high‑GWP HFCs and gives regulators a statutory lever to drive sectoral transitions.
- Clean‑technology and HVAC equipment makers that design for low‑GWP refrigerants — they should capture retrofit and new equipment demand created by compliance deadlines.
- Communities affected by air pollution and climate change — the long‑term reduction in high‑GWP emissions supports state greenhouse gas goals and local air quality benefits.
Who Bears the Cost
- Producers and importers of existing high‑GWP bulk HFCs — they face inventory write‑downs, reformulation costs, or market loss as statutory caps take effect.
- Distributors and wholesalers holding legacy HFC stock — they must manage compliance, potential stranded inventory, and increased testing/recordkeeping to certify blended GWPs.
- HVAC and refrigeration service contractors — they will need training, new tools, and potentially new equipment to work with alternative refrigerants and may face transitional downtime and supply constraints.
- MDI and specialized ultra‑low temperature equipment users — although given temporary exemptions, manufacturers and customers must plan for a regulatory cliff when exemptions lapse, potentially incurring R&D or supply changes.
- State agencies and the state board — implementing inventories, procurement changes, rulemaking, and enforcement may require staff time and resources, particularly in the near term.
Key Issues
The Core Tension
The central dilemma is pace versus practicability: the bill forces a rapid market shift to meet climate goals and create demand for reclaimed and low‑GWP products, but sectors with limited technical alternatives or long equipment lifecycles need time and investment to adapt — and rushing the transition risks supply shortages, higher costs, or safety/regulatory gaps (especially for medical and ultra‑low temperature uses).
The bill ties critical definitions to federal regulatory text as it existed on a fixed date (Oct 1, 2024). That approach reduces ambiguity about meaning today but risks obsolescence if federal categories or testing standards move forward; it also creates complexity where federal and state approaches diverge.
The reclaimed refrigerant exemption hinges on a ≤15% new HFC content limit and Appendix A testing — both technically specific requirements that will generate questions about who pays for testing, which labs are accredited, and what documentation suffices for chain‑of‑custody and compliance audits. Small reclaimers and distributors may struggle with the administrative burden.
Another tension is the treatment of blends and blended GWP calculation. The statute applies limits to blended GWPs rather than components, which is sensible climate‑wise but practically demanding: manufacturers must perform or commission GWP calculations for each formulation and maintain verification records.
Market readiness is uneven; some sectors (medical inhalers, certain cryogenic uses) receive temporary relief, but those time‑limited carve‑outs create a compliance cliff: manufacturers must plan R&D, regulatory approvals, and supply chains in a compressed window. Enforcement depends on the state board’s subsequent rulemaking, so much of the bill’s practical effect will turn on how the board defines ‘impracticable’, the timelines it sets, and how stringently it enforces documentation and testing requirements.
Finally, there is a risk of loopholes or illicit imports if coordination with federal agencies and out‑of‑state suppliers is weak.
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