As global regulations continue to push for environmentally friendly alternatives, cold storage facility managers and operations teams are facing key decisions about updating their refrigeration systems. Whether you’re expanding your facility or upgrading old systems, choosing the right refrigerant is crucial for performance, safety, and compliance. While new refrigerants offer clear environmental advantages, they also come with trade-offs that cold storage businesses must carefully consider.
In this guide, we’ll walk through the most common types of new refrigerants—natural options like ammonia, CO₂, and propane, as well as synthetic Hydrofluoroolefins (HFOs). We’ll also introduce the category of A2L refrigerants, which includes popular options like R-32 and R-454B, and discuss the pros, cons, and risks involved with each so your business can make an informed, future-proof decision.
The Push for Change in Cold Storage Refrigerants
Cold storage businesses rely on refrigerants to maintain precise temperatures in walk-in coolers, freezers, and temperature-controlled warehouses. For decades, many facilities used hydrochlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs) like R-22 and R-404A. However, these refrigerants are now being phased out due to their high global warming potential (GWP).
In response, companies are turning to low-GWP alternatives like natural refrigerants, HFOs, and A2L refrigerants to stay compliant with environmental regulations, reduce emissions, and lower long-term operating costs. But the transition isn’t always simple.
Comparing Natural Refrigerants vs. HFOs and A2Ls
When selecting a new refrigerant for your cold storage operation, your three main categories are:
1. Natural Refrigerants
- Ammonia (R-717): Long used in industrial settings, ammonia is highly efficient and has a GWP of zero. It’s cost-effective but toxic in high concentrations, requiring extra safety systems.
- Carbon Dioxide (CO₂ or R-744): CO₂ is non-toxic and non-flammable. It has excellent heat transfer properties and a very low GWP. However, it operates under high pressure and needs specialized equipment.
- Propane (R-290): Known for high efficiency and low environmental impact, propane is flammable and typically reserved for smaller, sealed systems.
2. Hydrofluoroolefins (HFOs)
- R-1234yf and R-454B: These newer synthetic refrigerants are designed to replace HFCs with much lower GWP. Many HFOs are part of the A2L refrigerant class, meaning they are mildly flammable but easier to integrate into existing systems than hydrocarbons.
3. A2L Refrigerants
The industry has been paying special attention to A2L refrigerants such as R-32 and R-454B. These refrigerants are classified as “mildly flammable” (less flammable than propane but requiring careful handling). Their biggest advantages are:
- Lower GWP than HFCs.
- Energy efficiency in many system designs.
- Compatibility with certain newer equipment designed for retrofits.
However, the mild flammability of A2Ls means cold storage businesses need to invest in proper leak detection, ventilation, and technician training to ensure safe use.
Advantages of New Refrigerants
Cold storage businesses that adopt new refrigerants can see a wide range of benefits:
- Regulatory Compliance
Meeting EPA regulations and international protocols like the Kigali Amendment can help you avoid fines, operational delays, or costly retrofits down the line. - Improved Efficiency
Natural refrigerants like ammonia and CO₂ offer better heat transfer and thermodynamic efficiency, often leading to lower energy bills. Many A2L refrigerants also demonstrate efficiency advantages compared to legacy HFCs. - Future-Proofing Your Facility
Choosing a refrigerant with a low GWP ensures you won’t need to upgrade your system again due to future bans or regulations. HFOs and A2Ls are widely considered long-term solutions. - Environmental Impact
Natural options have either zero or near-zero GWP, while HFOs and A2Ls significantly reduce emissions compared to traditional HFCs.
Potential Risks and Challenges
While the upsides are strong, the transition to new refrigerants isn’t without complications.
- Toxicity and Flammability
Ammonia is toxic. Propane is flammable. And many A2L refrigerants—like R-32 and R-454B—are mildly flammable. Safety protocols, leak detectors, and staff training are critical to manage these risks. - Higher Upfront Costs
Systems using CO₂, propane, or A2Ls often require upgraded compressors, condensers, or ventilation. These initial investments can be steep but may pay off in energy savings over time. - Complexity in Maintenance
Newer systems may require specialized knowledge, limiting the number of technicians qualified to maintain them. A2Ls, in particular, demand familiarity with mild flammability protocols. - Regional Code Restrictions
Some local jurisdictions place limits on the use of flammable or toxic refrigerants. Before committing to an A2L or natural refrigerant, check applicable building and safety codes.
Practical Tips for Cold Storage Businesses
If your cold storage facility is due for a refrigerant upgrade, here’s how to move forward strategically:
- Assess Your Facility’s Needs – Consider your space, cooling load, workforce, and budget.
- Consult with a Refrigeration Expert – They can help you model long-term costs and compliance factors.
- Compare Total Lifecycle Costs – Don’t just focus on installation—look at maintenance, energy usage, and expected service life.
- Work with Trusted Partners – Collaborate with experienced providers like American Insulated Panel to ensure your facility’s building envelope—especially the insulated panels and trim—can support the performance and safety of the new refrigerant system.
- Plan for Safety Upgrades – Installing leak detectors, ventilation systems, and emergency protocols is critical when switching to flammable or mildly flammable refrigerants like A2Ls.
Supporting Energy Efficiency with Quality Panels and Trim
No matter what refrigerant you choose, a well-sealed, high-performance building envelope is essential. Insulated metal panels and replacement cold storage trim from American Insulated Panel help ensure your system doesn’t waste energy due to air leaks or thermal bridging.
Your panels should be tight-fitting, corrosion-resistant, and easy to sanitize. Trim pieces should create a smooth, seamless fit to reduce moisture buildup and maximize insulation performance. Upgrading refrigerants without evaluating your insulation is like replacing your furnace but leaving the windows open—inefficient and costly.
Final Thoughts
Cold storage businesses are at a crossroads. Whether you choose natural refrigerants, HFOs, or A2L refrigerants, understanding the trade-offs will help you avoid costly missteps. With the right partners, planning, and infrastructure—including your panels and trim—you can make a smooth, smart transition that benefits both your operation and the environment.
