Whitegoods Help article

Climate Classes for fridges, freezers and fridge-freezers

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Quick Answer

Climate class is the ambient (room) temperature range within which a refrigeration appliance is designed to operate reliably. It is printed on the rating plate inside or on the back of the appliance. Most UK domestic fridges, freezers, and fridge-freezers are climate class SN, which covers 10 to 32 degrees Celsius. Installing outside this range – particularly in a cold garage in winter – can cause the appliance to malfunction.

What Is Climate Class?

All refrigeration appliances are tested and rated for a specific range of ambient temperatures. Outside this range, the appliance may be unable to maintain correct internal temperatures – either because it cannot shed heat in a hot environment or because the thermostat shuts off in a cold one. The climate class is printed on the appliance’s rating plate, which is usually on the inner side wall of the fridge or freezer compartment, or at the back of the unit.

Finding the climate class on your appliance

The rating plate may not use the phrase “climate class” directly. On many appliances it simply reads “Class SN” or “Class N” – this is the climate class designation. See our guide on finding the model and serial number on a fridge or freezer for where to locate the rating plate on your specific appliance.

Climate Class Reference Table

Climate class Name Minimum temperature Maximum temperature
SN Extended Temperate +10 °C +32 °C
N Temperate +16 °C +32 °C
ST Sub-Tropical +16 °C +38 °C
T Tropical +16 °C +43 °C
SN-ST Extended Temperate to Sub-Tropical +10 °C +38 °C
SN-T Extended Temperate to Tropical +10 °C +43 °C

Most domestic refrigeration appliances sold in the UK are climate class SN or SN-ST. Class SN means the appliance is designed to work correctly in ambient temperatures from 10 to 32 degrees. The majority of UK kitchens, utility rooms, and indoor spaces stay within this range throughout the year.

What Happens Outside the Climate Class Range?

❌ Too cold (below minimum)

  • In a cold garage or outbuilding, ambient temperature can fall below 10 degrees in winter
  • In a combined fridge-freezer with a single thermostat, the thermostat may shut off the compressor entirely – the fridge stays at temperature from the cold ambient air, but the freezer is no longer actively cooled and can defrost
  • Standalone freezers are less susceptible because their thermostat target (minus 18 degrees) cannot be met by ambient cold air alone
  • See our guide on can you put a fridge-freezer in a garage?

❌ Too hot (above maximum)

  • In a very hot kitchen, garage in summer, or in direct sunlight, the ambient temperature can exceed 32 degrees
  • The condenser cannot shed heat effectively when the surrounding air is too warm – the appliance runs continuously, works harder, and may struggle to maintain internal temperature
  • Prolonged operation above the rated maximum can cause compressor overheating and failure
  • Energy consumption increases significantly

Practical Guidance

  • ✅
    Check the climate class on the rating plate before installing any fridge or freezer in a garage, shed, cellar, or other non-standard location. The rating plate is usually inside the fridge compartment on the side wall.
  • ✅
    Do not install next to a heat source. Positioning a fridge next to a cooker, boiler, or radiator, or in direct sunlight, can cause the surrounding temperature to exceed the climate class maximum even in a normal kitchen.
  • ✅
    If installing in a cold outbuilding, look for an appliance specifically rated for low temperatures. Some manufacturers now produce refrigeration appliances rated down to minus 15 degrees or lower, specifically for garage and outbuilding use. Search for “garage-rated” or “outbuilding” freezers and check the specific climate class.

Frequently Asked Questions

What does SN mean on a fridge or freezer?

SN is a climate class designation meaning “Extended Temperate.” It indicates the appliance is designed to operate correctly in ambient (room) temperatures between 10 and 32 degrees Celsius. This is the most common climate class for domestic refrigeration appliances sold in the UK. The designation is printed on the rating plate inside the appliance.

Does climate class affect which fridge I can put in a garage?

Yes. In a UK garage in winter, temperatures below 10 degrees are common. A standard SN-rated fridge-freezer may not work correctly below this point, and in the case of combined units with a single thermostat, the freezer section can partially defrost. If a garage installation is required, look for an appliance with a lower minimum temperature rating – some products are specifically rated for cold environments. See our guide on putting a fridge-freezer in a garage for the full explanation.

Can I put my fridge next to the cooker?

Avoid it where possible. Placing a fridge adjacent to a cooker, boiler, or in direct sunlight can raise the ambient temperature around the appliance above its climate class maximum. This makes the fridge work harder, increases energy consumption, and can shorten the appliance’s lifespan. A gap between the fridge and any heat source, and positioning away from direct sunlight, is best practice.

Last reviewed: April 2026.

Discussion

103 Comments

Grouped into 77 comment threads.

Sarah 4 replies What would happen to a fridge freezer with a climate rating of T (18 - 43 ) if the temperature frequently drops to 13-14 degrees? We don't have the heating on overnight or during the day and the temp is often this low in winter before the heating goes on. We're looking for a non plumbed FF with ice dispenser and the ones we like in our price range are Ts.

What would happen to a fridge freezer with a climate rating of T (18 – 43 ) if the temperature frequently drops to 13-14 degrees? We don’t have the heating on overnight or during the day and the temp is often this low in winter before the heating goes on. We’re looking for a non plumbed FF with ice dispenser and the ones we like in our price range are Ts.

Sarah

Likely replying to Andy Trigg (Whitegoodshelp)

Thanks Andy,I had read that but it’s not really quite the same as it’s not going in a garage, it makes sense to me why it would defrost if the temperature outside is lower than the fridge temperature but why wouldn’t a fridge operate properly below 18 degrees?

Andy Trigg (Whitegoodshelp)

Likely replying to Sarah

Hello Sarah. As far as I’m aware the main issue is when temperatures fall quite low. Do they sell those climate classes in the UK? I know that overnight in winter my house easily drops below 16 degrees and can go as low as 14 – 18 degrees is the temperature that we actually have our central heating thermostat set at, so to us at least that is a nice comfortable temperature. It’s obvious that almost every house in the UK will fall below 18 degrees especially overnight in winter. I am not aware of any problems this would cause with a normal fridge, or even a fridge freezer, or freezer.

The problems I am aware of are all related to when temperatures fall considerably lower such as when inside a garage. The only thing I can think of is that the climate class you quote is not designed for the UK and is designed to be sold in countries where temperatures never drop below 18 degrees (not even sure such a country even exists).

Sarah

Likely replying to Andy Trigg (Whitegoodshelp)

Thanks Andy it just seems to be LG models and they’re available on UK websites. They state recommended room temp as between 18 – 43, just not sure whether to risk buying one, might give there tech department a ring!

Katy C 4 replies These are brilliantly helpful comments and I'm now plumping for a Beko FF freezer as a result, so thanks! I also want to get a separate fridge for the garage (so we can turn it on and off separately when we're not using it) but can't work out what the recommended brands are for fridges. Given the temperature issues discussed, can anyone advise how UK weather affects fridges and recommend what the best brands/models are for a garage? (Our garage is dry but not at all insulated.) Thanks.

These are brilliantly helpful comments and I’m now plumping for a Beko FF freezer as a result, so thanks!

I also want to get a separate fridge for the garage (so we can turn it on and off separately when we’re not using it) but can’t work out what the recommended brands are for fridges. Given the temperature issues discussed, can anyone advise how UK weather affects fridges and recommend what the best brands/models are for a garage? (Our garage is dry but not at all insulated.) Thanks.

Anne

Likely replying to Katy C

@Katy C

I believe the issue only arises when operating fridge freezers in garages. Basically, when the ambient temperature falls below a certain temperature, the thermostat (on single thermostat models) believes that it is cold enough to store the food in the fridge and turns off the compressor for both the fridge and the freezer and thus the contents of the freezer can defrost. If the appliance has 2 thermostats – one in the fridge and one in the freezer section – this will not occur.

As I mentioned in previous posts, I bought a Beko CDA565FW and it operated perfectly when the temperatures reached -10 last winter. I travel a lot because I am an English teacher and have lived in probably more than 30 different places over the past 30 years and I can honestly say it is the best fridge I have ever had.

Having said that, I must warn you that some models of Beko fridge freezer had a design fault which has caused fires including the one in the London block of flats recently. Here is a link for more information:

https://refsafety.beko.co.uk/

Good luck Kathy

Washerhelp

Likely replying to Anne

Thanks Anne: I changed “have” to “had” because the safety issue you mention only affects fridge freezers made between 2000 and 2006.

Katy C

Likely replying to Anne

Thanks Anne. I was also advised by someone at Comet that Beko were perceived as a more reliable brand than Hotpoint for fridges and freezers so may look into that Beko fridge model you have.

Anne

Likely replying to Katy C

@Katy C

When the man delivered my Beko, he told me that he had far fewer call-outs to collect/repair Bekos than the other top-name brands. He shared the Comet salesperson’s opinion that they were more reliable than other big-name brands.

The model I have has a lovely, sleek design (taller and narrower than most). It does not frost up – big thumbs up! The drawers are quite roomy. It is about 50:50 (freezer/fridge). The only negative comment I read in the reviews was that shorter people find it difficult to reach the top shelf but I am 5ft 6 and I have had no problems.

Hope this helps

A x

Andrew Fenwick 3 replies Hi, Can somebody please explain how a Garage Beko Fridge Freezer with Freezer Guard actualy manages to properly control the Fridge and The Freezer when it only has one Thermostat and one Compressor? I have just bought a new one and it it failing to control these temperatures properly. The fridge is permanently too cold in ambients of + 10 to Zero which ruins frost susceptible groceries. There are many people on Revoo complaining of the same issue. Beko and Currys will not admit there is an issue.

Hi, Can somebody please explain how a Garage Beko Fridge Freezer with Freezer Guard actualy manages to properly control the Fridge and The Freezer when it only has one Thermostat and one Compressor?

I have just bought a new one and it it failing to control these temperatures properly.

The fridge is permanently too cold in ambients of + 10 to Zero which ruins frost susceptible groceries.

There are many people on Revoo complaining of the same issue.

Beko and Currys will not admit there is an issue.

Andrew Fenwick

Likely replying to Andy Trigg (Whitegoodshelp)

Hi Andy
I’m afraid your article, which I had read, did not answer my questions.
Beko state in their advertising that this FF (and many others) is “perfect for outbuildings below zero”.
If it were true, this statement contradicts the climate class SN/T. What are we to believe?
This FF does not appear to have a heater to prevent the Fridge Freezing at below zero ambients.
This FF does not appear to have an air flow system to cool the fridge from the freezer as required – like some single stat FFs have.
I could not get the Fridge up to the correct temperature of 4C. The crisper was always between -2C & Zero.

PayPal found in my favour and after a huge battle Currys have picked it up. I will not be buying from Currys again.

I have now bought a dedicated Freezer which supposedly operates down to -15C.

Andy Trigg (Whitegoodshelp)

Likely replying to Andrew Fenwick

Andrew, with your permission I have pasted below some of the very interesting and useful points that you made to me by email, which will be of great use to other people researching this issue –

Some fridge freezers and even some Bekos get round the 1 stat issue by cooling the fridge using air flow from the freezer. The Freezer is kept at a constant -18 to -20 C and cool air is sent to the fridge as necessary using an electronically controlled shutter.

However, without a fridge heater (seems like an oxymoron doesn’t it) there is nothing to stop the contents of the fridge from freezing when ambient falls below zero.

Unfortunately the Beko I chose did not have AirFlow Fridge Cooling.

Beko could do well to explain exactly how each model is supposed to work so that customers can make informed decisions. We should not have to become Refrigeration Engineers in order to buy a fridge freezer. Beko definitely state FFs “Perfect for sub zero outbuildings”:

Agreed.

I’ve just carried out an experiment. The ambient temperature in my garage at the moment is 10 degrees centigrade. I’ve had a thermometer inside my fridge, which is inside the garage but turned off (I usually turn it off when temperatures drop as I only use it to store beer). After about 20 minutes the temperature inside the fridge is 12 degrees, which shows that there is a small amount of protection against the outside temperature with the insulation around the appliance. It is quite rare for my garage to drop below freezing.

But essentially it’s not ideal at all. The advice to people has to be don’t put a fridge freezer in an outbuilding. If you need to, make sure it uses some system for coping with the lower temperatures in winter or it has a separate compressor for fridge and freezer section – which will be expensive if anyone does it. If you try a Beko fridge freezer because they advertise they are OK for a garage make sure it has their airflow system.

Carol Callow 3 replies Hi, I hope you can advise me what is happening with my large upright frost free freezer (Zanussi). The freezer is about 2 and half years old and the alarm has started to go off. It is sitting in my sunroom which does get quite hot but I manage the temperature with a fan so the room is always approx 25 degrees. However, in the last two weeks the alarm has gone off nearly every day. I haven't found the reason yet but have pressed the quick free button on and it does go off. Can you help me to identify the problem please?

Hi, I hope you can advise me what is happening with my large upright frost free freezer (Zanussi). The freezer is about 2 and half years old and the alarm has started to go off. It is sitting in my sunroom which does get quite hot but I manage the temperature with a fan so the room is always approx 25 degrees. However, in the last two weeks the alarm has gone off nearly every day. I haven’t found the reason yet but have pressed the quick free button on and it does go off. Can you help me to identify the problem please?

Andy Trigg (Whitegoodshelp)

Likely replying to Carol Callow

Hello Carol. 25° is not good, but it is within the climate class range that most refrigeration appliances are designed for. If it has been working okay for 2 1/2 years than it seems unlikely to be caused by the room temperature. Therefore it sounds likely has just developed a fault and needs an engineer to look at it. If the alarm is going off it means it is not getting cold enough anymore. The only thing you can really do is make sure the door is closed properly and that the door seal isn’t worn or damaged. It could be a fault on the sensor, the PCB, or something to do with the refrigerant.

Carol Callow

Likely replying to Andy Trigg (Whitegoodshelp)

Hi Andy, Thanks for your reply. In the meantime I had taken out the drawers to see if there was any blockages anywhere. I started from the bottom and found some ice, so then I carried on until I got to the top draw (Quick freeze) where I keep ice cubes. When I pulled away the bags of ice I found a LOT of ice and frost. I therefore removed everything from that space and cleaned up the ice/frost. The freezer does seem to be working a little better. We’ve only had the alarm go off once which was after I had cleaned out the top space. A bit annoying. However, having no manual I am at a lost how to check the back of the machine for any further blockages.

Andy Trigg (Whitegoodshelp)

Likely replying to Carol Callow

Hello Carol. If it happens again need to talk to defrost by unplugging it at least 12 hours or try to accelerate the process with gentle heat or put in a bowl of hot water inside. This is because there is often a lot of ice behind the back wall which is insulated. If that hasn’t been removed then it isn’t too long before the problem re-occurs.

Andy Trigg (Whitegoodshelp) 2 replies Thanks for the update Andrew. So presumably the one you bought was wrongly advertised because it doesn't have the "freezer guard" feature? The ones that do have it will still be suitable as advertised? Also, it seems that the freezer guard only protects the freezer so is no use the fridge freezer because the fridge will still malfunction if the temperature is too low.

Thanks for the update Andrew. So presumably the one you bought was wrongly advertised because it doesn’t have the “freezer guard” feature? The ones that do have it will still be suitable as advertised? Also, it seems that the freezer guard only protects the freezer so is no use the fridge freezer because the fridge will still malfunction if the temperature is too low.

Andrew

Likely replying to Andy Trigg (Whitegoodshelp)

Hi Andy

Getting complicated isn’t it :)
Ours did have Freezer Guard so Freezer bit was supposedly good for -15C, but being a Fridge Freezer the fridge wont work properly under +10C .

Therefore their claim that Frost Free Fridge Freezers with Freezer Guard are-Perfect for Outbuidings etc” is false.
i.e. These Bekos with a Fridge are not suitable. Avoid!
Currys took the Fridge Freezer back for full refund.
We have bought a Freezer with Freezer Guard and will update you on its suitability over time.

Andy Trigg (Whitegoodshelp)

Likely replying to Andrew

Hi Andrew, sorry, I just remembered you said in one of your first comments, “This FF does not appear to have an air flow system to cool the fridge from the freezer as required”

Barry Seward 1 reply In 2018 we bought a built in Kenwood fridge freezer from Curry’s, after a couple of years the freezer temperature would not get low enough, it was out of warranty so we paid for an engineer to fix it, they tried a few things and eventually declared it was unrepairable. We bought a new Hoover fridge freezer from Boots website (run by AO), while still under warranty this too developed the same symptom, freezer not cold enough, the engineer suggested turning off the fridge for 6 hours and turned it back on which seemed to work. I took out a service policy just in case. I then learnt about Climate Class which up until then I was unaware of, both appliances I bought were climate class ST (designed for sub tropical climate), could this be the cause of the problems? If so why would they be selling these for use in the UK? Recently the freezer was failing again and the fridge was also not working, after several visits the engineer replaced the compressor and did a re-gas. I asked on several occasions if the climate class was a problem, the engineer shrugged it off and said it shouldn’t make much difference. What is your opinion on this?

In 2018 we bought a built in Kenwood fridge freezer from Curry’s, after a couple of years the freezer temperature would not get low enough, it was out of warranty so we paid for an engineer to fix it, they tried a few things and eventually declared it was unrepairable. We bought a new Hoover fridge freezer from Boots website (run by AO), while still under warranty this too developed the same symptom, freezer not cold enough, the engineer suggested turning off the fridge for 6 hours and turned it back on which seemed to work. I took out a service policy just in case. I then learnt about Climate Class which up until then I was unaware of, both appliances I bought were climate class ST (designed for sub tropical climate), could this be the cause of the problems? If so why would they be selling these for use in the UK? Recently the freezer was failing again and the fridge was also not working, after several visits the engineer replaced the compressor and did a re-gas. I asked on several occasions if the climate class was a problem, the engineer shrugged it off and said it shouldn’t make much difference. What is your opinion on this?

Andy Trigg (Whitegoodshelp)

Hello Barry. At face value you’d think that the climate class ST is inappropriate for the UK. The temperature range in climate class ST states the minimum temperature at which the appliance is designed to reliably function at is 18°. Well during winter, most people’s kitchens are likely to drop below 18°. However, what I can’t reliably advise upon is whether or not dropping below this “minimum temperature” is going to cause any real world problems.

However, climate class SN, which is appropriate for Europe, has a minimum temperature of 10°, which is not likely to cause any problems in the overwhelming majority of households in the UK unless we are experiencing extremely cold weather.

The only thing I can say is that if the temperature drops too low, then a combined fridge-freezer (that only uses one compressor) may switch off the compressor when the fridge temperature remains at the selected temperature because the temperature of the room it is in is 5° or below.

This usually only happens when a fridge freezer is kept in a garage or another outbuilding. The temperature of the room it is in would need to be cold enough that the temperature inside the fridge compartment is naturally at around 5°. If this happens then it has no need to run the compressor to keep the fridge compartment cold. Unfortunately, due to the way they are designed this also stops the freezer compartment from being cooled down. This may not be an issue if this situation only lasts a few hours. But if it was all night or longer then the freezer compartment will start to defrost.

If we bear in mind the fact that the fridge compartment is insulated, you would expect this only happens when the temperature of the room it is in is roughly around 0° or lower. All this is explained in detail in my article can you run a fridge freezer in a garage?

So this is the main problem associated with room temperatures, (which is rectified once the temperature of the room rises high enough to trigger the thermostat in the fridge compartment to start running the compressor again). In other words it doesn’t cause the appliance to “break down”, it causes it to stop working properly until the temperature rises to proper levels. It also only affects combined fridge-freezers, and not separate fridges and separate freezers. It’s unlikely that temperatures inside most normal kitchens would drop to these temperatures.

The only other thing is if the temperature in your kitchen (assuming it is kept in a kitchen) can regularly drop below 18° then it is regularly falling below the temperature that the manufacturers claim it is designed to operate in. My kitchen is probably on average around about 18° of an evening in winter. So on very cold nights it probably drops at least a couple of degrees or more as the heating switches off at 9 PM. In poorly insulated homes I wouldn’t be surprised if it could drop several degrees below. The question is exactly what happens if this is the case. You can only assume that manufacturers use the climate temperatures as approximate ideal temperatures and that dropping, or even raising a few degrees either way may not cause any issues at all. Otherwise, they would be completely wrong to be selling them in the UK.

Kevin 1 reply Hope someone can help me. Up until recently I was not aware that some fridge freezers were only designed to work in centrally heated environments! The Zanussi ZRB632FW we have states in the manual, "Climate Class: SN - N- ST - T. The same is specified on all the specifications I have found on the web. There is no rating plate internally or on the back of the unit or on the compressor. Can anyone help me with regard to what the rating for this unit actually is?

Hope someone can help me. Up until recently I was not aware that some fridge freezers were only designed to work in centrally heated environments!

The Zanussi ZRB632FW we have states in the manual, “Climate Class: SN – N- ST – T. The same is specified on all the specifications I have found on the web.

There is no rating plate internally or on the back of the unit or on the compressor. Can anyone help me with regard to what the rating for this unit actually is?

Dan 1 reply what fridge should I choose when I live in western Arizona? In summer, temperatures are above 43 C. Are there no fridges for climates above 43?

what fridge should I choose when I live in western Arizona? In summer, temperatures are above 43 C. Are there no fridges for climates above 43?

Andy Trigg (Whitegoodshelp)

Likely replying to Dan

Hello Dan. Any fridge sold in your area should be appropriate for the climate. I would go to a reputable local retailer and ask them about it but I would expect all the refrigeration appliances to be the same climate rating and appropriate for your climate.

David somewhereinuk 1 reply Re Washerhelp, My answer is "Of course you can" but the proviso is that the fridge must have a crankcase heater fitted in case of cold weather In general, domestic electrical products that are sold in the UK are IMHO "value engineered" to make the maximum amount of profit. This means that you never get a crankcase heater.

Re Washerhelp, My answer is “Of course you can” but the proviso is that the fridge must have a crankcase heater fitted in case of cold weather

In general, domestic electrical products that are sold in the UK are IMHO “value engineered” to make the maximum amount of profit. This means that you never get a crankcase heater.

Whitegoodshelp (Andy Trigg)

Likely replying to David somewhereinuk

Thanks David. Haven’t seen them here, presumably because we don’t have such massive temperature drops. However, they wouldn’t fix the main problem of 1-stat controlled fridge-freezers defrosting when the temperature drops below freezing, which is more of a problem in the UK where temperatures in a garage drop enough to cause the stat to shut off even when the freezer still needs cooling.

Anne 1 reply Very unlucky Neil. Is your Beko a Frost free model? According to the Beko website only the frost-free models are designed to operate in garages and outbuildings. I had no problems at all throughout the winter and am very, very pleased with the Beko!

Very unlucky Neil.

Is your Beko a Frost free model? According to the Beko website only the frost-free models are designed to operate in garages and outbuildings.

I had no problems at all throughout the winter and am very, very pleased with the Beko!

Neil Blair

Likely replying to Anne

Hi Anne

It is indeed frost free. Like I mentioned in my previous post, wouldn’t recommend Beko to anyone because of the hassle I had. Now maybe it’s just pot luck I managed to pick the runt of the Beko litter, but I doubt it. I’m still toying with the idea of taking fridge to the council recycling point, or holding out until the weather picks up to see if new thermostat will spring back to life. While I don’t know if there’s any truth to the rumour, but there is still that slim chance it’s not working because the temperature is colder outside fridge than inside – if that makes any sense. The Samsung integrated fridge inside the house is 10yrs old and still going like a trooper.

Regards

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