Which refrigerant system should a new or upgraded cold room use?
Refrigerant choice now drives equipment design, compliance cost and serviceability for 15–20 years. Choose the direction before collecting quotes so suppliers price comparable systems.
Short answer
The right refrigerant depends on four things: local phase-down and safety rules, plant size, ambient climate and the service skills available near the site. Large industrial plants often use ammonia or CO₂; small and mid-size rooms use CO₂, hydrocarbons in low charges, or lower-GWP blends. Confirm every choice with a qualified engineer and the current national rules.
Reviewed by the ColdMatch editorial team · Updated 2026-10-17
This is planning-level guidance for facility owners and procurement teams. It is not a remote diagnosis. Refrigerant handling, electrical work and pressure-system service must be carried out by qualified refrigeration professionals.
Diagnostic decision tree
1. Is the plant large and centrally located with trained operators?
Yes → Ammonia or CO₂ (or cascade) are common candidates.
No → Consider CO₂ packs, low-charge hydrocarbons or low-GWP blends.
2. Is the site in a hot climate?
Yes → Ask how CO₂ efficiency is handled at high ambient (e.g., ejectors, parallel compression).
No → CO₂ transcritical is widely used.
3. Are occupied spaces near the plant?
Yes → Check safety classification and charge limits carefully.
No → Continue.
4. Are certified technicians for the refrigerant available locally?
Yes → Proceed to specification.
No → Factor service access into the choice.
1. Start from the rules
Check national implementations of the Kigali Amendment, EU F-gas Regulation 2024/573 or US AIM Act transitions, and local safety codes for flammable or toxic refrigerants.
2. Then scale and climate
Plant size, ambient design temperature and part-load profile change which system is efficient and economic.
3. Then people
A technically ideal refrigerant without local service capability raises downtime risk.
CO₂-equivalent of a 10 kg charge (illustrative)
Assumptions
- • EU F-gas method: tonnes CO₂e = charge (kg) × GWP ÷ 1,000
- • GWP values as listed in Regulation (EU) 2024/573 annexes; confirm current figures
| R404A (GWP 3,922) | 39.2 t CO₂e |
|---|---|
| R448A (GWP 1,387) | 13.9 t CO₂e |
| R744 / CO₂ (GWP 1) | 0.01 t CO₂e |
Higher CO₂e charges carry more leak-check, service and phase-down exposure; the regulation text sets the exact obligations.
| Family | Typical use | Key considerations |
|---|---|---|
| HFC/HFO blends | Small–mid commercial rooms | Phase-down exposure, some mildly flammable (A2L) |
| CO₂ (R744) | Commercial packs to industrial | High pressures, hot-climate design |
| Ammonia (R717) | Large industrial plants | Toxicity, trained operators, plant-room design |
| Hydrocarbons (R290 etc.) | Low-charge self-contained units | Flammability, charge limits |
Information to prepare before sourcing
Suppliers can only quote accurately against measured facts. Gather the following before requesting proposals.
- ✓Room/plant capacity and temperatures
- ✓Site ambient design temperature
- ✓Distance to occupied spaces
- ✓Local technician availability
- ✓Country of installation (for rules)
A senior cold-chain specialist stays with your project from first brief to commissioning.
Next steps
Frequently asked
How ColdMatch Group works — independent B2B procurement and sourcing platform — ColdMatch Group is an independent B2B procurement and sourcing platform for industrial refrigeration, cold storage and cold-chain projects from USD $250K+, where the ColdMatch team reviews each buyer brief, contacts suitable third-party suppliers on the buyer's behalf and organizes their responses.
Sources (checked 2026-10-17)
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