The phase-out timeline, condensed

R-22 (chlorodifluoromethane, HCFC-22) was the dominant refrigerant for residential air-conditioning, commercial unitary equipment, and low-temperature commercial refrigeration from the 1970s through the early 2000s. Its ozone depletion potential (ODP 0.055) made it a target of the Montreal Protocol, and the U.S. Clean Air Act phase-out ran as follows:

• January 1, 2004: No new R-22 equipment manufactured with more than 500 grams of charge for residential applications.
• January 1, 2010: No new R-22 equipment manufactured, full stop.
• January 1, 2015: No virgin R-22 produced or imported for service use.
• January 1, 2020: All production and import of R-22 ceases. Reclaimed R-22 is the only legal source.

Today, every technician will eventually encounter R-22 in legacy equipment — and the legal supply is shrinking year over year as the reclaimed pool is consumed.

What is still legal in 2026

• Recovering R-22 from decommissioned equipment for reuse or reclamation.
• Servicing existing R-22 equipment with reclaimed R-22 that meets AHRI 700 purity.
• Selling reclaimed R-22 to certified technicians, with the same §82.160 recordkeeping as virgin refrigerant.
• Retrofitting R-22 equipment to use an approved replacement refrigerant.

What is no longer legal:

• Manufacturing or importing virgin R-22 anywhere in the U.S.
• Venting R-22 during service, repair, or disposal — the §82.154 prohibition has been in force since 1994.
• Selling R-22 to non-certified technicians — §82.160 applies to reclaimed R-22 just as it applies to virgin refrigerants.

The Universal 608 exam asks whether you understand that the phase-out affects production, not possession or service. You can still legally work on an R-22 system today; you just can't buy new R-22 to put in it.

The replacement refrigerants

There are three families of R-22 replacement in widespread use:

Drop-in HFC blends (limited use today):

• R-407C — an R-22 replacement for comfort cooling and unitary equipment. GWP 1774, requires POE oil retrofit, slightly lower capacity than R-22.
• R-422D — a drop-in alternative for low- and medium-temperature refrigeration. GWP 2729, mineral oil compatible with additive.

Retrofit blends (require specific procedures):

• R-438A (formerly MO99) — a drop-in for low- and medium-temperature refrigeration. Mineral oil compatible.
• R-427A — an R-22 replacement for residential AC. Requires POE oil retrofit.

Long-term A2L replacements (new equipment only):

• R-454B — the leading new-equipment replacement for unitary AC.
• R-32 — used in ductless mini-splits.
• R-1234yf — used in MVAC under Section 609.
• R-1234ze(E) — used in some commercial chillers.

The Universal exam emphasizes that drop-in replacements still require system-specific changes — oil type, expansion device adjustment, possibly charge quantity — even if no major component swap is needed.

How to retrofit an R-22 system to R-407C

A typical retrofit follows this sequence:

1. Recover the R-22 using equipment rated for R-22 pressure. Send to a reclaimer.
2. Change the oil to POE. Mineral oil is not miscible with R-407C; residual mineral oil will cause lubrication problems.
3. Replace the filter drier with one rated for POE oil and R-407C.
4. Replace the metering device if the original is a fixed-orifice — R-407C has different pressure/temperature characteristics and may not feed correctly through the original orifice.
5. Adjust the charge to R-407C specifications (typically 95 to 105 percent of the R-22 charge by weight).
6. Label the equipment prominently with the new refrigerant type and the date of retrofit.
7. Update the service records to reflect the refrigerant change.

This sequence appears verbatim in many practice questions. The exam wants you to know that you cannot simply recover the R-22 and add R-407C; the system must be modified.

The economic reality

Reclaimed R-22 prices have risen sharply since 2020 as the available pool shrinks. In some U.S. markets, reclaimed R-22 now costs more per pound than R-454B. Many equipment owners are choosing to replace the condensing unit or the entire system rather than pay for a refrigerant top-off. As a technician, your recommendation to the customer should weigh:

• Equipment age and condition
• Cost of reclaimed R-22 vs system replacement
• Energy efficiency of new equipment vs R-22
• Local utility rebates for high-efficiency replacements

The exam's favorite question

The most common R-22 question on the Universal exam is some version of: "When can a technician sell or purchase R-22 legally?" The answer is only reclaimed R-22 may be sold, and only to certified technicians, with proper recordkeeping. Virgin R-22 production ended in 2020. Reclaimed R-22 is still legal today. The day after the last pound of reclaimed R-22 is consumed, every existing R-22 system becomes a candidate for retrofit or decommissioning.

A practical closing note

R-22 will remain in the field for another decade, possibly two. Master the recovery and reuse procedures, know the retrofit options cold, and be ready to advise customers when the economics finally tip toward replacement. That combination is what separates a competent service technician from a master technician.