Alternatives to R-410A?

Potential Replacements for R-410A – An In-Depth Look

Rather you like it or not folks R-410A will be going away and it’s going to be happening a lot sooner than everyone thinks. In 2015 the Environmental Protection Agency announced that they will beginning the initial steps of phasing out R-404A in July of 2016, January 2017, and 2018. Along with that they also announced that the tried and tested R-134a will begin being phased out in the year 2020. (2021 model years.) HFCs are quickly coming to an end.

On top of the EPA’s actions on phasing out HFC refrigerants there was an amendment added to the Montreal Protocol only a few months ago in November of 2016. More than one-hundred countries met in Kigali, Rwanda. The United States, the European Union, and many other countries have been working tirelessly on getting an HFC phase out amendment added to the Montreal Protocol for years. Well the last holds out finally gave in and everyone’s dreams finally came true in late 2016. The goal of the agreement was to ban all HFC refrigerants across the world by the year 2100. The United States along with all of the other countries happily signed the agreement.

Under the signed amendment developed countries, including the United States, must reduce their use of HFC refrigerants by ten percent by 2019 from 2011-2013 levels, and then by eighty-five percent by 2036. Along with this developed countries will also have to comply with a freeze of HFC consumption levels in the year 2024. By the late 2040’s all developed countries are expected to consume no more than fifteen to twenty percent of their baselines. In order to meet these guidelines developed countries have already begun phasing out the other HFCs as we discussed above. 410A is not on the chopping block yet but it will be soon.

Everything, and I mean everything, is pointing in the direction that 410A will be no more. The only thing that I could see stopping the phase out of 410A in the near future is the presidency of Donald Trump. Now, keep in mind that this is all speculation, but Trump has said before that he doesn’t believe in Climate Change. So, if you don’t believe in something than why would your country pledge and sign a treaty saying that you would phase something out because of Climate Change? It doesn’t make sense. No one knows what Trump will do though. He may leave things the way they are or he may go back and try to renege on the treaty.

The Four Rules

The race to find an alternative refrigerant for R-410A is on. After all, 410A has to be one of the greatest used, if not the greatest, refrigerant in the world. Everyone needs a cool house and most of the time they’re either using R-22 or R-410A. Finding an alternative has proven difficult though as there has been no perfect match so far. There are four considerations companies have to consider before they can sign off on a golden ticket replacement product. These four ‘rules’ or considerations are Environment, Energy Efficiency, Safety, and Economy.

  1. If we look at the first criteria of environment we have to consider two things. One being that the new product can’t contain Chlorine like the old CFCs and HCFCs of the past. We don’t want a repeat of the O-Zone damage that we went through the eighties and nineties. The second being that the replacement cannot have a large Global Warming Potential like the HFC refrigerants used today. The whole point is to have a refrigerant that does NOT damage the environment, or at least, does not damage the environment as much as the current HFCs do.
  2. Energy Efficiency pretty much explains itself. Obviously we do not want have a gas that would be used across the world that is terribly inefficient. What good would it do to if we’re just wasting energy and impacting the environment in another way? The whole robbing Peter to pay Paul mentality. It doesn’t make sense.
  3.  Safety is another consideration that has to be factored in when finding the ‘perfect’ refrigerant. One of the major risks here is flammability. Each refrigerant has a flammability rating and some are much higher than others. If you have proper training on dealing with flammable refrigerants than there is nothing to worry about. The danger comes in if the R-410A replacement is highly flammable. Commercial units are usually left alone. Only professionals ever attempt to maintenance them. With a home unit you run the risk of having novices or ‘Bubbas,’ trying to maintenance or even install their own machine. Imagine the risk they could be taking if the refrigerant they were dealing with was extremely flammable? (Like R-290.) The other aspect of safety is the toxicity levels of the refrigerant. If you have a leak and it is in a confined area what effect will that have on the people in that area? Will there be permanent damage to them after breathing it, or even death?
  4. Economy is the last and final aspect when looking for an alternative. What good is an alternative if no one can afford it? If a ten pound cylinder is north of $1,000 how is anyone going to be able to afford it? Cost is a large factor when considering an alternative. Truth be told I believe we’re seeing the cost problem now with the 134a replacement. The HFO 1234YF is nearly $700 for a ten pound cylinder. Imagine the cost involved if you had to refill your car after a repair? It’s quite the difference between the $100 cost of a thirty pound cylinder of 134a.

Ok, so with those four considerations in mind let’s review the possibilities of the future for replacing R-410A.

Hydroflurocarbons (HFC’s)

Yes, yes I know. R-410A is an HFC so why would we replace it with another HFC? Well, there is a push to change from 410A over to R-32 refrigerant. The thinking is that this wouldn’t be a permanent solution but more of a temporary until something better comes along. R-410A’s Global Warming Potential (GWP) is 1,725 times that of Carbon Dioxide. This large number is why 410A is being pressured to be phased out. While R-32 is an HFC it’s GWP is only 675. That is about a sixty percent decrease. It’s not a perfect bullet but it would help with the battle against Global Warming.

There are a few benefits to R-32 one of which I mentioned above. The first being the lower Global Warming Potential. The second benefit is that consumers will see a ten percent reduction in their energy usage when switching to R-32. Another pro for R-32 is the cost. It is overall much cheaper than R-410A and is readily available to purchase now. R-32 has seen wide usage across Australia and in July of 2015 was approved for limited usage by the United State’s Environmental Protection Agency. (Visit link to their website here.)

Ok, so we have see the pros of HFC-32 now let’s take a look at some of the downsides.  R-410A is classified as ‘Non-Flammable,’ according to the Safety Data Sheets. The flammability rating on 410A is ruled as class 1. When looking at the same data for R-32 we find that it is ‘Extremely Flammable,’ and is classified under a level 4 for flammability. Both of these come from each products Safety Data Sheets which can be found by clicking here for R-410A and here for R-32. And to think people were freaking out about the flammability of 410A a few years ago!

Another downside to R-32 that companies have complained about is the toxicity of breathing in the product. Proponents have rebutted saying that R-32 is no more toxic than any other refrigerant when breathed in. Which I believe is a perfectly valid point. The last downside and one that is extremely difficult to prove is that R-32 causes cancer. There has been no conclusive tests on this theory and so far it is speculation. The belief is that this rumor started in California due to their strict environmental laws.

So, in review on R-32 we have a cheaper alternative refrigerant to R-410A and one that has nearly sixty percent reduction in Global Warming Potential. But, this replacement product is extremely flammable and may put people at risk. In my opinion I do not believe this refrigerant meets the four conditions to be accepted as an acceptable substitute. (Safety comes to mind.) If we do start using HFC -32 here in the United States than I could see it being only temporary until a better HFO refrigerant comes along. I wouldn’t put money on seeing this at your next service call.

Sources on R-32:


Hydrocarbons are a different story. They have been around a lot longer than the HFOs and even HFCs. Everyone is at least somewhat familiar with them and even a laymen has heard of most of them. (Propane, Isobutane, Carbon Dioxide.) Some of these refrigerants go all the way back to the nineteenth century if you can believe it. Before the rise of CFCs such as R-12 Hydrocarbons were widely used in various establishments. One of the first air conditioned movie theaters in the early twentieth century was cooled by Carbon Dioxide.

Alright, that’s enough of a history lesson. Let’s dive in and take a look at the possible scenario on each one:

R-290 (Propane)

Alright so let’s get the selling point of R-290 out of the way now. Propane has zero O-Zone depletion potential and only a GWP of only 3. Yes, that’s right. 3. Humongous difference when comparing to 410A’s GWP of 1,725.  Right out of the gate R-290 meets the environmental criteria for an alternative. Overall it is rather energy efficient and the cost is relatively cheap coming in at right about the same cost as a thirty pound cylinder of R-410A. (A little over one hundred dollars a cylinder.) We’re three for four on propane passing the feasibility test. There is just that last one. That one that we overlooked, safety.

The disadvantages are the flammability risk, safety standards/codes, and ensuring each technician is properly trained before handling. If propane is handled in the right way and by a properly trained technician than everything will be fine. However, if ‘Bubba,’ tries to install his own unit or retrofit his own machine with propane that is where things get dangerous. A common occurrence over the years since R-22 has grown more expensive is for companies to market their R-290 product as a drop in replacement for their R-22 units. This is a dangerous practice since the R-22 machines were not meant to use propane. The end result can result in injury or an explosion.

R-290 is already seeing widespread use in India and China and now the middle eastern countries such as Saudi Arabia, Kuwait, and others are expressing interest for R-290 due to it’s better performance in higher ambient temperature environments. The Environmental Protection Agency has approved R-290 for use in stand alone small charge units including retail food refrigerators and freezers. All that being said though I do not foresee seeing R-290 being widely used as a replacement for R-410A.

R-290 Sources

R-744 (Carbon Dioxide)

R-744 has no harmful environmental effects. I mean, there is nothing more natural than Carbon Dioxide. There is no O-Zone depletion potential and the Global Warming Potential is minimal. In fact as I mentioned earlier R-744 was one of the very first refrigerants used in the world only losing popularity once the easier to use R-12 was introduced.

R-744 requires very low energy to run, is non-toxic, and non flammable. The problem that comes with R-744 is not the dangers of flammability like that of R-290 but instead with economy. R-744 runs at an extremely high pressure during operation. The pressure is so high that the efficiency of the compressor suffers greatly and the durability and thickness of the pipes needs to be increased to compensate. The thickened pipes and the custom high pressure equipment increases the overall cost of R-744 for most uses.  Some could also make the argument that Carbon Dioxide refrigerant due to it’s increased pressure of 2,000 pounds per square inch also makes it dangerous to work on. That’s a tally of two out of four.

While R-744 is seeing usage in other smaller applications like that of refrigerated cases I do not foresee it being used as an alternative to R-410A due to the additional cost of the higher pressure equipment and the potential safety risk of the high pressure.

R-744 Sources

R-717 (Ammonia)

Ammonia or R-717 is often regarded as the most efficient refrigerant gas on the market today. Along with it’s energy efficiency aspect it also has no O-Zone depletion potential and has a Global Warming Potential of zero. The cost for R-717 is much lower than other HFC refrigerants on the market today creating a cost savings if someone was to switch over to R-717.

If we refer to the four rules again that I stated above we are three for four so far. The fourth rule, and honestly one of the most important, is safety. R-717 is not the safest refrigerant… by any means and it is one of the reasons why it is not commonly used in today’s residential market.

Like R-290 R-717 is highly flammable. Don’t let me say it though, let’s take a look at the exact wording on the safety data sheet on R-717: “Flammable. Toxic by inhalation. Causes burns. Risk of serious damage to eyes. Very toxic to aquatic organisms.” – Source. So we have a highly flammable product that has high toxicity and can cause damage to your skin and eyes. I can see why this hasn’t taken off.

While R-717 does have the safety detriments it is still widely used today in many types of manufacturing plants such as dairies, ice cream plants, frozen food production, cold storage warehouses, and meat processing plants.  I’ve said this before but I’ll say it again. This potentially hazardous material works because it is being used in a large commercial setting. The Jo Schmo do-it-yourselfer is never going to tamper or try to fix one of these commercial machines. If something goes wrong at one of these businesses they call in a professional. If R-717 becomes a mainstream refrigerant found in every home in the country than the risk of do-it-yourselfers accidentally burning themselves or worse causing an explosion goes up exponentially. For that reason alone I do not foresee R-717 being used as a suitable R-410A replacement.

R-717 Sources

Hydrofluoroolefin (HFO’s)

HFO’s are already seeing large usage in the European Union and now beginning in the United States. Most of the applications have been under the HFO 1234YF used in automobile applications. As of January 1st, 2017 cars can no longer be manufactured with R-134a systems in the EU. The United States isn’t too far off either with our final date being 2020. (2021 model year.) 1234YF is quickly replacing the R-134a market that we know today. To some it’s 1994 all over again where we phased out the R-12 in place of R-134a.

The selling point on the new  HFO’s are the environmental impact. The goal here was to create something as similar as they could to the current HFCs on the market but without the high Global Warming Potential that comes with them. For example, the 1234YF refrigerant has a global warming potential of four. For comparison, the Global Warming Potential of R-134a is over 3,000. There is a significant difference and the climate will be greatly affected if the whole world switches over to these new HFO refrigerants. (Or Hydrocarbons.)

The problem with HFOs is that they are all in developmental stage. The two conglomerate companies DuPont/Chemours and Honeywell have been putting endless hours and money into developing new HFO refrigerants that could take the place of the beloved R-410A. The other complication with HFO’s is that since they are being invented by only a few companies these same companies hold the patents on the new product. This creates an almost monopoly type setting where Honeywell and Chemours can set whatever price they want on their new Opteon and Solstice brands. Now, I’m not attacking these companies for having a high priced product. There is cost involved and I am sure it is quite high to create these new refrigerants. The reason I bring it up is for you the consumer or the business owner to realize just how expensive these refrigerants are. For example, a ten pound cylinder of the HFO 1234YF goes for about $700. For comparison a thirty pound cylinder of R-134a goes for about $120.

While there are MANY HFO refrigerants under development and available today I am only going to be looking at the possible 410A alternatives. With the introduction out of the way let’s dive into the various HFO refrigerants available today:

Opteon DR-55 (R-452B)

R-452B passed the flammability and toxicology review required by the ANSI/ASHRAE in March of 2016. Upon it’s approval it was given a preliminary ASHRAE number of R-452B. While this new alternative refrigerant from Chemours still has a somewhat high Global Warming Potential of 676 it is still sixty-five percent lower than it’s R-410A counterpart. It also comes with a lower flammability rating than other proposed R-410A solutions. (R-290 for example.)

Along with it being friendlier to the environment  and safe to use R-452B matches the capacity of R-410A allowing it to be compatible with currently used R-410A equipment. This allows for a quick and easy change of refrigerants on existing 410A units in the field.

While this refrigerant is still in the preliminary stages I could definitely see this becoming mainstream once it goes to market. It has right around the same GWP of R-32 but comes with a lower flammability rating. My only concern on this new refrigerant from Chemours is the cost. How much is this going to cost per cylinder when it rolls out this year or next? HFO’s are notoriously known for their high cost. Let’s hope that this new refrigerant doesn’t fall into that same category.

R-452B Sources

Opteon XL41 (R-454B)

R-454B is another new HFO refrigerant that was developed by the Chemour’s company. This refrigerant has the lowest GWP of all of the drop in R-410A replacements out there today. It comes in at a GWP of 466, that is seventy-eight percent lower than 410A. The formula on the refrigerant itself is a very close match to 410A and has been proved to be higher performing than 410A in some instances.

The downside of this new refrigerant is it’s mildly flammable status. While flammable refrigerants are perfectly safe when used in the right hands they can be extremely dangerous in the hands of a novice. Even though this refrigerant is in fact the lowest GWP alternative out there today I do not foresee it becoming a mainstream alternative to 410A simply because of it’s flammability rating. The chances of a homeowner hurting themselves is just too great.

R-454B Sources


I spent some time digging through Google and Honeywell’s website looking for mentions of a feasible R-410A alternative. The best that I found was a press release from 2013, four years ago, saying that they were working on a new 410A alternative. I haven’t been able to find much more news on these refrigerants. When I reviewed their website, which can be found by clicking here, I found four new Solstice HFO alternatives… but they were not for R-410A. Instead they were for R-134a, R-404A, and R-22.

I may be mistaken here and missed the boat on finding their alternatives to R-410A. If I have please let me know by sending me an e-mail and I’ll update this article. (Follow this link and scroll to the bottom to send me an e-mail.)

What’s Winning?

At this point it is hard to say but if I was to put my money down I would be betting on two refrigerants. Over the next few years we are either going to see a push for the Hydrocarbon R-32 or the new Opteon DR-55 (R-452B). As I said before I have a feeling that the cost of the new R-452B will be quite a bit higher than what we are used to today. The consideration that has to be made is the lower cost of R-32 when compared to R-452B worth the risk of extra flammability? Is it worth saving money but having that risk of flammability?


Even though the R-32 and the R-452B refrigerants may be the new normal when it comes to home air-conditioning it is important to realize that they will not last. They are good viable alternatives to the R-410A used today but they are not perfect. They still have a somewhat higher Global Warming Potential. R-32 is too flammable for some people’s taste. R-452B will most likely be to expensive for others. Who knows what the next alternative will be?

There’s no telling what the final answer will be at this point in time. The only certainty is that everything is fluid and the refrigerants that we are using today could change this year or next and that I’ll do my best to keep everyone informed! If you see anything that is incorrect or not factual please take the time to e-mail me by clicking here and I will correct as soon as I can.

Thanks for reading and if you enjoyed the article please take the time to subscribe to our mailing list by navigating to the top right of the page and registering your e-mail. Thanks again!

Alec Johnson


You may also like