Refrigerant Types + EPA 608 Reference

Why this matters

Refrigerant rules + types changed dramatically in the last 5 years. R-22 is gone; R-410A phasing out; R-32 + R-454B coming in for 2025+. Field techs must know which refrigerant is in each system + the rules around handling. Wrong refrigerant mix = compressor damage; improper recovery = EPA fine. This is the field card.

Common refrigerants today

R-410A (Puron, AZ-20)

Status: phasing OUT 2025; production banned 2024 (AIM Act). Existing systems serviced; no new equipment.

Type: HFC blend (R-32 + R-125 50/50)

GWP (Global Warming Potential): 2,088

ODP (Ozone Depletion Potential): 0

Pressure: high - 350 PSI saturation at 100°F

Refrigerant oil: POE (polyolester)

Most residential AC + heat pumps installed 2010 - 2024.

R-32 (next-gen single-component)

Status: replacing R-410A for new equipment (2025+).

Type: HFC single component (difluoromethane).

GWP: 675 (~ 1/3 of R-410A)

ODP: 0

Mildly flammable (A2L safety class) - special handling

Pressure: similar to R-410A.

Refrigerant oil: POE.

Adoption: Daikin, LG, Mitsubishi started; expanding.

R-454B (Opteon XL41, Solstice 454B)

Status: alternative to R-32 for U.S. market 2025+.

Type: HFC blend (R-32 / R-1234yf 68.9 / 31.1).

GWP: 466 (~ 1/4 of R-410A).

ODP: 0.

Mildly flammable (A2L).

Pressure: similar to R-410A.

Brands: Trane, Carrier, Lennox using it 2025.

R-22 (Freon, old residential)

Status: BANNED for new equipment 2010; production banned 2020.

Type: HCFC (single component).

GWP: 1,810.

ODP: 0.055 (ozone-depleting).

Pressure: lower - 196 PSI saturation at 100°F.

Service-only: existing systems can be serviced with reclaimed R-22.

Customer guidance: R-22 systems > 15 years old typically not worth servicing.

R-454C, R-455A, R-466A

Emerging: alternative for commercial refrigeration + specific applications. Not yet mainstream residential.

Other (less common in residential service)

• R-134a: automotive AC + chiller; residential refrigerators
• R-407C: blend; some replacement scenarios for R-22
• R-404A: commercial refrigeration; phasing out
• R-744 (CO2): supermarket refrigeration; high-pressure
• R-290 (propane): mini split heat pumps; flammable

Safety classifications (ASHRAE 34)

A1: non-toxic, non-flammable. R-22, R-410A, R-134a.

A2L: low toxicity, mildly flammable. R-32, R-454B, R-1234yf. Modern HVAC refrigerants are mostly A2L.

A3: non-toxic, highly flammable. R-290 (propane), R-600a (isobutane). Mini splits + appliances.

B1, B2, B3: toxic; specialty industrial.

EPA 608 certification (required for refrigerant handling)

Universal: full certification covers all systems. Pass written test.

Type I: small appliances (refrigerator, freezer).

Type II: high-pressure systems (AC, heat pump).

Type III: low-pressure systems (chillers).

Required: anyone purchasing OR handling regulated refrigerant.

Recordkeeping: certified techs log all refrigerant transactions; sales restricted to certified.

Pressure-temperature (P/T) charts

P/T chart relates saturation pressure to temperature. Used for charging + diagnosis.

R-410A condenser at 95°F outdoor: saturation ~ 277 PSI, target high side ~ 380 PSI.

R-410A evaporator at 40°F coil: saturation ~ 118 PSI, target low side ~ 130 PSI.

R-32 + R-454B: similar pressures to R-410A but slightly different. Carry P/T chart card.

Charging methods

Superheat charging: fixed-orifice systems. Target superheat from manufacturer chart based on indoor wet-bulb + outdoor temp.

Subcooling charging: TXV systems (most modern). Target subcooling per manufacturer (typically 8 - 14°F).

Weighed-in (factory charge): most reliable. Per nameplate weight.

P/T method: less accurate; verify with superheat / subcool.

Recovery (mandatory before service)

EPA regulation: recover refrigerant from system before any opening (compressor change, leak repair, equipment removal).

Recovery rate (per EPA standard):

• Small appliance: 80% recovery OR 4" HG vacuum
• Large appliance: 80% recovery OR 0" HG vacuum
• Industrial: 90% recovery

Recovery into DOT-rated tank: tank labeled + tracked.

Reclaim vs reuse

Reclaim (return to OEM purity): only certified reclaim facility may resell. Required for any refrigerant returned to circulation.

Reuse on same system: allowed within same job IF refrigerant unaltered + clean.

Tools required for refrigerant work

• Manifold gauge set + hoses
• Refrigerant scale (digital, 0.05 oz resolution)
• Vacuum pump (deep vacuum capable)
• Vacuum gauge (micron gauge)
• Recovery machine + tanks
• Leak detector (electronic + soap solution + UV dye)
• Schrader removal tool + cores
• Tubing cutter + flaring tool

Common refrigerant mistakes

Mixing refrigerants (illegal; permanent compressor damage). Skipping recovery before opening system (EPA violation; fine $35,000+ per violation). Adding R-22 to R-410A system OR vice versa. Overcharge (high head pressure; compressor strain). Undercharge (low pressure; coil freeze). Skipping vacuum pull (moisture in system; acid formation; failed compressor). Wrong oil (mineral oil in HFC system damages compressor). Skipping leak repair (charged system loses refrigerant; service call returns).

Refrigerant pricing (2025)

Relative per-pound cost, most to least expensive:

• R-22: highest by far - recycled-only supply, no new production
• R-410A: elevated and rising as supply tightens
• R-134a: moderate
• R-454B: lower - new mainstream refrigerant
• R-32: lowest - new mainstream refrigerant

Customer impact: 5-lb leak repair on R-22 system can run into a substantial four-figure sum for refrigerant alone + diagnostic + repair labor. Often more than equipment replacement.

Documentation requirements

• Refrigerant purchase log (EPA Form)
• Tech certification
• Service records: refrigerant added/removed weight + reason
• Equipment leak rate (commercial > 50 lb charge)

Transitioning a customer

R-22 system replacement decision:

• System > 12 years old: replace
• Equipment failure (compressor, coil): replace with R-410A / R-32 system

R-410A system:

• Still serviceable
• Refrigerant available but expensive
• New equipment 2025+ likely R-32 / R-454B

Safety + A2L refrigerants

R-32 + R-454B + R-1234yf are mildly flammable. Specific rules:

No open flames during charging.

No-smoke / no-ignition source nearby.

Charge in well-ventilated area.

Equipment designed for A2L: A2L-rated compressors + service valves + recovery machines.

Service training: many manufacturers require A2L-specific certification.

References

• 40 CFR Part 82 (Stratospheric Ozone Protection / Refrigerant Rules)
• EPA 608 Technician Certification
• ASHRAE 34 (Refrigerant Designation + Safety Classification)
• AHRI 700 (Refrigerant Specifications)
• AIM Act (American Innovation + Manufacturing Act) - HFC phase-down
• Manuall internal: Common Gauges + Meters, Soldering + Brazing