If you’ve ever stopped to think about how your fridge keeps soda cold or a commercial walk-in unit preserves produce, the unsung hero behind the scenes is the refrigerant. As a refrigeration unit supplier, I get so many questions from customers (café owners, warehouse managers, even people fixing their old home fridges) about which refrigerant works for their setup. It’s not a one-size-fits-all answer, that’s for sure. Over the past 10 years in this game, I’ve seen so many mistakes people make—like grabbing a refrigerant that’s too harsh for their old unit, or skipping the new, eco-friendly stuff just because they’re used to the old kind. Let’s break down the main types, how they work, who they’re for, and what you need to know before picking one. Refrigeration Unit
First, let’s keep it super basic: refrigerants are the fluids that cycle through your unit, absorbing heat inside and releasing it outside to cool things down. The catch? A lot of the old go-tos are getting phased out because they wreck the ozone layer and contribute to climate change. That’s why it’s so important to stay on top of the types, especially if you’re a business owner with commercial units—cutting corners here can lead to fines or having to replace your whole system earlier than planned.
Let’s start with the OG ones, the CFCs (chlorofluorocarbons) and HCFCs (hydrochlorofluorocarbons). Back in the day, these were everywhere—you’d find R-12 (a CFC) in old car ACs and home fridges, and R-22 (an HCFC) in a ton of pre-2010 commercial and residential units. But here’s the tea: CFCs were banned globally back in the 90s because they straight-up destroyed the ozone layer. HCFCs aren’t much better—they still have ozone-depleting potential, so they’re being phased out too. In the U.S., R-22 production stopped in 2020, and now it’s only available as recycled stock, which is pricy and hard to get. I had a customer last year with a 2008 walk-in freezer that ran on R-22; when his leak popped, he had to pay 3x more for recycled R-22 than if he’d just upgraded to a newer unit that uses the modern stuff. Pro tip: if you have a unit with CFCs or HCFCs, don’t wait for it to break—start looking for a retrofit or a new unit now, because supply will only get tighter. That’s one of the biggest headaches I see folks avoid when they work with us as their supplier—we help them plan before their old refrigerant runs out.
Next up, the transitionals: HFCs (hydrofluorocarbons). When CFCs and HCFCs got the boot, HFCs were the quick fix. They don’t harm the ozone layer, which was a win, but the problem is their global warming potential (GWP) is through the roof. Like, R-134a (the most common HFC) has a GWP of 1,430—that means it’s 1,430 times worse than CO2 for global warming over 100 years. A lot of new cars and old fridges still use R-134a, but governments everywhere are cracking down on HFCs too. The Kigali Amendment, which most countries signed, requires cutting HFC production by 80% by 2047. So even though HFCs were supposed to be the “safe” middle step, they’re now on the chopping block. I had a bakery client a couple years ago who installed new commercial fridges with R-134a—they loved them at first, but now they’re stressing about having to replace them in 5 years because the refrigerant will be regulated more. That’s why we always walk customers through the long-term plan, not just the immediate cost. We don’t want anyone to waste money on a unit that’ll be obsolete before its time.
Now, the cool kids on the block: the low-GWP refrigerants. These are the ones we’re pushing heavy right now, and for good reason. They have minimal impact on the ozone layer and way lower GWP than HFCs. Let’s go through the main ones here, because there are a few different types that work for different needs.
First up, HFOs (hydrofluoroolefins). HFOs are the new kids, made to fix the HFC problem. Their GWP is super low—like under 1, which is basically on par with CO2. R-1234yf is the most common HFO, used in new car ACs now, and R-1234ze is used in chillers and commercial refrigeration. The best part? A lot of newer units can retrofit to HFOs without huge modifications, which is a big win for business owners who don’t want to drop a ton on a whole new system. The catch with HFOs is that they’re still a bit pricy, and there’s some debate about their long-term stability—since they’re so new, we don’t have 30+ years of data like we do with R-22. But for anyone building a new unit or retrofitting a newer system, HFOs are a solid, future-proof pick. I recommend HFOs most to customers in areas with strict environmental regulations, because they’ll keep them compliant for years to come.
Then there are the natural refrigerants, which are basically the oldest refrigerants ever, but they’re making a huge comeback because they’re so eco-friendly. These are things like ammonia (R-717), CO2 (R-744), hydrocarbons (like propane, R-290, and butane, R-600a), and water (R-718). Let’s talk through each, because they’re really different from the synthetic ones people are used to.
Ammonia is a big one for industrial refrigeration—like big warehouses, food processing plants, or ice rinks. It has a GWP of 0, it’s super efficient, and it’s cheap. The downside? It’s toxic, so you can’t use it in small spaces or places where people are around a lot, like a café or a small grocery store. I work with a lot of food distribution centers that use ammonia for their massive cold storage units—they love it because it’s way more efficient than any synthetic refrigerant, and it’s easy to source. They just have to follow strict safety protocols, like leak detectors and proper ventilation, which is a small price to pay for the cost savings over time.
CO2 is another natural one, and it’s becoming more popular for commercial and even some residential units now. It’s non-toxic, non-flammable, and has a GWP of 1. The tricky thing about CO2 is that it works best in high-pressure systems, so it’s great for things like supermarket display cases and walk-in freezers, but not always the best for small home fridges—though newer technology is fixing that. I’ve installed a few CO2-based units for small grocery stores downtown, and their owners rave about how they’ve cut their energy bills by almost 20% compared to old HFC units. The only con is that CO2 units are a bit bulkier and more expensive upfront, but the long-term savings and eco benefits make it worth it.
Hydrocarbons (HCs) like propane and isobutane are what old home fridges used back in the day, and they’re coming back for small units, like residential fridges, vending machines, and small display cases. They have a GWP of less than 3, which is insane, and they’re super efficient. The catch? They’re highly flammable. So you can’t use them in big commercial units with lots of space, because a leak could cause a fire risk. But for small, well-ventilated setups, they’re perfect. I had a customer who runs a chain of convenience stores; he switched all his small vending machine fridges to propane-based units last year, and he’s saved thousands on refrigerant costs and energy. He just makes sure his techs inspect those machines monthly for leaks, which is easy to do.
Water is a wild card—no one really uses it as a refrigerant yet, but some experimental systems are testing it for large-scale chillers. It has a GWP of 0, but it only works at super low temperatures, so it’s not practical for most units right now. Maybe in the next 10 years it’ll be more common, but for now, it’s mostly in R&D.
Wait, there’s also a hybrid category? No, not really, but sometimes you’ll hear about blends—mixes of synthetic and low-GWP refrigerants that bridge the gap between old and new. Like, some blends combine small amounts of HFO with natural refrigerants to get a GWP that’s lower than HFCs, but still uses existing unit components so you don’t have to redo your whole system. That’s a great middle ground for people who don’t want to spend a ton on a full retrofit or new unit, but need to move away from HFCs. I’ve recommended blends to a few small restaurant owners who have 10-year-old walk-in fridges—they cost less than HFOs, are compliant with current regulations, and work with their existing systems without any major changes.
Now, let’s talk about what actually matters when picking a refrigerant, because it’s not just about eco stuff. First, your unit’s age and make. You can’t just swap R-22 for R-134a in an old unit, for example—they have different pressure levels, so you need to make sure it’s compatible. That’s where we come in, by the way—we do free consultations with customers to check their current units and tell them what’s possible. Second, your space and safety. If it’s a small café with limited ventilation, you can’t use ammonia, so HFO or a low-GWP blend is better. Third, local regulations. Some cities or states have bans on certain refrigerants, so you have to check that first—you don’t want to install a unit that’ll be illegal in 2 years. Fourth, long-term costs, not just upfront. A CO2 unit might cost more now, but it’ll save you money on energy and refrigerant over 10 years, so it’s worth it.
I’ve seen so many customers make the mistake of just going for the cheapest refrigerant, and they end up paying for it later. Like, a guy who owned a bodega tried to use a cheap off-brand HFC in his old fridge, and the leak ruined the compressor within 6 months. Or a warehouse that skipped proper safety for their ammonia units, and had a small leak that forced them to close for a day, losing thousands in spoiled produce. That’s why we push customers to do their research, and if they’re not sure, just ask. We’re not here to push the most expensive unit—we’re here to find what works for their needs, their budget, and their future.
Another thing people don’t talk about: refrigerant disposal. When your unit is at the end of its life, you can’t just vent the refrigerant into the air. Old CFCs and HCFCs have to be recovered and recycled, because releasing them is illegal and bad for the planet. New low-GWP refrigerants also have to be disposed of properly, but some can be reclaimed and reused, which saves money and reduces waste. We offer refrigerant disposal services for all the units we sell, so customers don’t have to stress about that part—it’s one less thing on their plate.
Over the past few years, I’ve noticed a huge shift in what customers want. 5 years ago, most people only cared about upfront cost and how well the unit cools. Now, everyone asks about GWP, compliance, and long-term reliability. And that makes sense—everyone’s tired of being hit with unexpected costs because of new regulations, or having to replace their whole unit way before they thought they would. As a refrigeration unit supplier, that’s why we prioritize educating our customers, not just selling them a product. We’ll tell you if a cheaper unit is going to cause you headaches in 5 years, or if a slightly more expensive refrigerant will save you money in the long run.
Wait, let’s recap to make sure I didn’t miss anything. The main types are: Ozone-depleting CFCs/HCFCs (phased out, avoid if possible), HFCs (old transitionals, being phased out, only use if you can’t get low-GWP options right now), low-GWP HFOs (future-proof, good for most new builds and retrofits), natural refrigerants (ammonia for large industrial, CO2 for commercial, hydrocarbons for small well-ventilated spaces, water experimental), and blends (middle ground for older units). The key takeaway is that the right refrigerant depends on your unit, space, budget, and local rules—there’s no “best” one for everyone.
If you’re a business owner looking to upgrade your refrigeration units, or you’re dealing with a leak and need to pick a new refrigerant, don’t guess. Working with a supplier that knows the ins and outs (like us) makes all the difference. We can assess your current setup, explain the pros and cons of each refrigerant for your specific needs, and help you avoid costly mistakes down the line. Whether you’re a small restaurant with a walk-in fridge, a warehouse with massive cold storage, or someone building a new facility, we’ve got the options and the expertise to get you set up right. Just reach out to chat through your needs, no pressure, no jargon—we’ll break it down simple so you can make the best call for your business.
Refrigeration Unit References:
- U.S. Environmental Protection Agency. (2023). Phasedown of Hydrofluorocarbons (HFCs). Retrieved from EPA.gov
- ASHRAE. (2022). 2022 ASHRAE Handbook: Refrigeration. American Society of Heating, Refrigerating and Air-Conditioning Engineers
- United Nations Environment Programme. (2016). The Kigali Amendment to the Montreal Protocol. Retrieved from UNEP.org
- International Energy Agency. (2021). The Future of Refrigeration: Low-GWP Refrigerants and Energy Efficiency. Retrieved from IEA.org
- European Commission. (2020). Regulation on Fluorinated Greenhouse Gases. Retrieved from EC.europa.eu
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