Natural Refrigerant in Thailand 2026 — R-290 / R-600a / R-744 Selection Guide

Why Natural Refrigerants Now

The Kigali Amendment (Thailand ratified 2019) mandates HFC consumption reduction:

• -10% by 2029 (vs 2020-2022 baseline)
• -30% by 2035
• -50% by 2045
• -80% by 2047

HFCs widely used in Thailand — R-32 (GWP 675), R-410A (2,088), R-134a (1,300), R-404A (3,943) — will face import quotas, rising prices, supply restrictions. Natural refrigerants offer a phase-out-proof path for the equipment lifetime.

graph LR
    A[HFC R-32/R-410A/R-134a] -->|Kigali phase-down| B{Path}
    B -->|Short-term| C[HFO R-1234yf/R-454B
GWP 1-466]
    B -->|Long-term| D[Natural Refrigerants
GWP 1-3]
    D --> E[R-290 Propane
Commercial AC/Chiller]
    D --> F[R-600a Isobutane
Household Fridge]
    D --> G[R-744 CO2
Supermarket/Deep-freeze]
    style D fill:#10b981,color:#fff
    style E fill:#3b82f6,color:#fff
    style F fill:#14b8a6,color:#fff
    style G fill:#0ea5e9,color:#fff

Compare the Three

Property	R-290 Propane	R-600a Isobutane	R-744 CO₂
Chemical	C₃H₈	C₄H₁₀	CO₂
GWP (IPCC AR4)	3	3	1
ODP	0	0	0
Safety class (ASHRAE 34)	A3 highly flammable	A3 highly flammable	A1 non-toxic, non-flammable
LFL (% in air)	1.7-1.8	1.7-1.8	N/A
Critical temp (°C)	96.7	134.7	31.0 (transcritical)
Operating pressure (bar)	8-15	1-6	60-120
Max charge per IEC 60335-2-40	≤ 150g (small room)	≤ 57g	unlimited (A1)
Capex vs HFC baseline	+20-35%	+15-25%	+30-50%
COP improvement	+3-5% vs R-32	similar to R-32	+10-20% transcritical chillers

Choose by Application

R-290 Propane — Commercial AC, Chiller, Heat Pump

Sweet spot:

• Commercial AC 5-50 kW (hotels, offices, restaurants)
• Industrial chiller 50-500 kW (beverage plants, processing)
• Heat pump for heating + hot water

Pros:

• High COP — 3-5% energy savings vs R-32
• Future-proof Kigali — near-zero GWP
• Low refrigerant cost — propane ~฿80-150/kg vs R-32 ~฿650-900/kg

Cons:

• A3 flammable — charge limit 150g per room per IEC 60335-2-40
• Systems must be hermetic sealed, no field-brazed joints
• Service technicians need BS EN 13313 spark-proof training — scarce in Thailand
• Ventilation calculation + leak detection required

R-600a Isobutane — Household + Light Commercial Fridge

Sweet spot:

• Household refrigerators (95% of global household fridges use R-600a)
• Small commercial refrigeration: mini bar, display chiller, ice maker
• Bottle coolers in convenience stores

Pros:

• Lowest capex in natural refrigerant family — +15-25% vs R-134a
• Low pressure — robust compressor + piping + long lifetime
• Small charge ≤ 57g — high safety margin

Cons:

• A3 flammable — no field-braze
• Cooling capacity limited to ~3 kW per system — unsuitable for commercial AC

R-744 CO₂ — Supermarket + Deep-Freeze + Heat Pump

Sweet spot:

• Supermarket refrigeration (chiller + freezer chain) — Big C, Lotus's, Makro 2024-2025 pilots
• Deep-freeze -40°C (seafood export, ice cream)
• Cold-climate heat pump (northern Thailand, cold storage)

Pros:

• A1 non-flammable + non-toxic — safe in any location
• High COP in transcritical + ejector — 10-20% efficiency gain
• Cheapest refrigerant — CO₂ ~฿20-50/kg

Cons:

• Highest capex +30-50% vs HFC (compressor + piping rated for 90-120 bar)
• Transcritical mode efficiency drops in hot climate (>32°C) — special gas cooler design needed
• Thai technicians experienced with R-744 transcritical are scarce

Decision Matrix

graph TD
    Start[New system being designed] --> Q1{Cooling capacity?}
    Q1 -->|≤3 kW| R600a[R-600a Isobutane
Hermetic small refrig]
    Q1 -->|3-50 kW| Q2{Charge size + room volume?}
    Q1 -->|≥50 kW + deep-freeze| R744[R-744 CO₂
Transcritical]
    Q2 -->|Charge ≤150g per room| R290[R-290 Propane
Commercial AC/Chiller]
    Q2 -->|Charge >150g| Q3{Insurance + safety
requirement?}
    Q3 -->|Strict A1 required| R744_alt[R-744 CO₂
or HFO/HFC short-term]
    Q3 -->|A3 OK + technicians available| R290_split[Split into multiple
R-290 systems]
    style R290 fill:#3b82f6,color:#fff
    style R600a fill:#14b8a6,color:#fff
    style R744 fill:#0ea5e9,color:#fff
    style R744_alt fill:#0ea5e9,color:#fff
    style R290_split fill:#3b82f6,color:#fff

Thai Regulatory Landscape

1. Hazardous Substance Act B.E. 2535

• R-290 propane: UN 1978 — DIW permit required
• R-600a isobutane: UN 1969 — DIW permit required
• R-744 CO₂: UN 1013 — pressure vessel + transport permit

2. Department of Skill Development (DSD) — Refrigeration Technician License

Currently no certification specific to natural refrigerants — most R-290 technicians use general training + supplementary BS EN 13313 (UK standard).

3. RACT + EIT/IIET

No full natural-refrigerant code yet — Thai standards reference ISO 5149 + EN 378 + ASHRAE 15 in the interim.

4. Department of Industrial Works (DIW)

R-290 + R-600a are listed in Annex II hazardous chemical list. Import + storage + commercial use require permits.

Saha Service Offering

Saha distributes + supervises natural refrigerants for commercial applications:

• R-290 / R-600a: household + light commercial refrigeration (mini bar, display chiller, beer bottle cooler)
• R-744 CO₂: supermarket + deep-freeze cylinder + heat pump installation
• Compliance: UN classification + DIW permit + hazardous-goods transport
• Engineering: charge size calculation + ventilation design + leak detection wiring

Send equipment spec + application + required charge size → team responds with refrigerant + supplier + price + compliance checklist within 24 hours.

Conclusion + Action

Natural refrigerants are no longer a future trend — they are a present requirement as Kigali pushes HFC prices up 30-100% over the next 5-10 years. R-290 + R-744 are likely to dominate Thai commercial refrigeration by 2035.

Recommendation:

1. New systems — choose natural refrigerants if supplier + technician available
2. Legacy HFC systems — plan phase-out within 7-10 years
3. Service techs — invest in BS EN 13313 training now — R-290 specialists will command premium rates in 3-5 years

For a detailed comparison see /en/compare/r290-vs-r600a-vs-r744-natural-refrigerant — full specs + capex + lifetime + safety class. Or see the HFC vs HFO transition path at /en/compare/hfc-vs-hfo-refrigerant-transition.