EPA Lifted an R-410A Deadline. Washington Contractors Still Need a State-Level Check.

A federal inventory reprieve is not the same thing as approval for every installation in every state. That distinction is back in focus after ACHR News reported September 25 that Washington officials say the state's HFC requirements remain in place despite EPA's R-410A changes. [1]

For a contractor deciding what to quote, buy or install, however, the current Washington text deserves a closer reading than a blanket ban headline. It includes a sell-through provision that was amended in 2025, and its equipment definitions can matter as much as the date on a distributor's invoice. [4, 5, 6]

The important qualification: Washington has its own sell-through provision

What EPA actually changed

EPA's final rule was published May 26 and became effective July 27, 2026. It removed the installation deadline for certain residential and light-commercial air-conditioning and heat-pump systems when all specified components were manufactured domestically or imported into the United States before January 1, 2025. [2, 3]

The revised provision retains a restriction on new systems using refrigerants with a global warming potential, or GWP, of 700 or greater, with that older-inventory allowance. Variable refrigerant flow systems, known as VRF, are excluded from this particular provision and have separate requirements. Do not read the change as permission to assemble any new R-410A system from any available components. [2]

The purchasing question is therefore specific: which components are being supplied, when were they manufactured or imported, and which rule applies to the system being installed?

Washington's dates and limits are a separate check

Washington's Table 3 in WAC 173-443-040 lists January 1, 2026 for new residential and nonresidential air-conditioning equipment other than room air conditioners and residential dehumidifiers, with a prohibition on substances having GWP greater than 750 and a building-code adoption condition. Room equipment, VRF and retrofits have their own rows. Washington's definition of air conditioning includes heat pumps. [6, 7]

Those categories should not be collapsed into a single rule for every item labeled HVAC. The relevant prohibition, the sell-through provision and any applicable exemption must be considered together. [4, 7, 8]

An older component is not automatically an older completed system

For a Table 3 row dated January 1, 2026, the two-year point is January 1, 2028. That date arithmetic does not by itself establish that a particular split-system installation qualifies. The current sell-through language distinguishes air-conditioning equipment manufactured before the effective date from VRF systems with components manufactured before that date. [4]

There is another detail worth flagging before a purchase order is signed: Washington defines the manufacture date of field-erected equipment around completion of the refrigerant circuit and its first charge. The labeling section likewise uses the first-charge date for field-erected or field-charged equipment. A component's factory date and the completed system's relevant date may therefore answer different questions. [4, 6]

Obtain a written, model-specific explanation from the supplier and seek Ecology confirmation where classification is unclear. Keep the component records and the basis for any claimed allowance with the job file. A sales description such as old stock is not enough documentation on its own.

Four questions to resolve before quoting older inventory

Existing equipment does not automatically need replacement

Ecology's FAQ says existing equipment can continue operating and homeowners can maintain and repair systems. The refrigerant transition is not, by itself, a finding that a customer's functioning equipment must be removed. [9]

One detail needs particular care. Ecology's FAQ describes replacement of both the exterior condensing unit and indoor evaporator together as a new system in an existing home. The codified definition in WAC 173-443-030 also includes a single-condenser, single-evaporator system in an existing facility with a new exterior condenser or condensing unit. Those descriptions are not identical. [6, 9]

For a condenser-only replacement, do not promise that a federal service-only label settles the Washington classification. Ask Ecology at HFC@ecy.wa.gov for an interpretation tied to the exact scope. Dispatch has not obtained a written equipment-specific determination resolving that difference. [9]

The 14-day leak rule is a different obligation

New-equipment restrictions and the Refrigerant Management Program should not be mixed together. WAC 173-443-165 applies its leak-repair requirements to covered systems with a full charge of at least 50 pounds using refrigerants with GWP of at least 150. Beginning January 1, 2024, it generally requires repair of detected leaks by a certified technician within 14 calendar days. Specific documented conditions can allow longer periods; 14 days is neither universal for every household system nor the rule's only permitted timeframe. [10]

Registration and inspection dates vary by facility size. Under WAC 173-443-105, medium facilities with a largest qualifying system of 200-1,499 pounds entered the registration and inspection phase in 2026. Small facilities with qualifying systems of 50-199 pounds have later 2028 registration and annual-inspection dates. Those later dates do not postpone the separate leak-repair and recordkeeping requirements that began in 2024. [10, 11, 12]

Covered facility owners or operators must keep the required records for at least five years. A service contractor should make the detection date, repair work, verification and any delay documentation easy for that customer to retrieve. [12]

What to change in the office this week

• Add state, equipment category, replacement scope and applicable refrigerant rule to the quote review, rather than relying on one national cutoff date.
• Request the component history and written eligibility basis before committing to older inventory; separately address field assembly and first charge.
• Escalate ambiguous condenser-only replacements and exemptions for written, job-specific clarification before promising eligibility.
• Keep new-installation eligibility separate from existing-system service and facility leak-management schedules.
• Do not use the transition alone to tell a customer that functioning equipment must be replaced.

The useful takeaway is a documented decision, not a slogan

Methodology

Sources checked September 27, 2026. Dispatch compared EPA's published May 2026 final rule and fact sheet with the current Washington Administrative Code, Ecology's October 2025 adopted-rule explanation and its public FAQ. ACHR News supplies the September 25 reporting hook; Dispatch did not attend the reported webinar or interview the officials. The article preserves the current two-year sell-through provision and flags, rather than resolves, the difference between the FAQ and codified single-condenser replacement definition. The January 2028 date is arithmetic for a January 2026 Table 3 row, not a finding that a particular system qualifies. Leak-management thresholds are treated separately from new-equipment restrictions. Bracketed source numbers correspond to the source links below. No equipment-specific agency approval has been obtained. Photo source and license were checked separately; only conventional image processing was used.