Heatwaves are now a regular part of summer, so a lot of us need better ways to stay cool indoors. Fans can help, but when the temperature really climbs, a portable air conditioner is what you really need. They’re a great option if you rent, live in an older home, or just don’t want the hassle of installing a fixed air con system. Just plug them in and you’re good to go.
In this article, we explain the main things to consider before buying a portable air conditioner. We’ve also highlighted some of the best portable air conditioners in the UK right now, and answered a few commonly asked questions. Prepare to be blown away…
What to look for in a portable air conditioner
There are lots of air conditioning options out there, so it helps to know what to look out for. Here’s a breakdown of the most important things to think about, including room sizes, energy ratings and extra features:
Room size & BTU rating
BTU (British Thermal Unit) tells you how much cooling power the unit has. Choose a unit that matches your room size. If it’s underpowered, it won’t cool effectively. Too powerful, and it might cool the room quickly but shut off before properly removing all the humidity,
7000 BTU is enough for small bedrooms up to 14 m²
9000 BTU is suitable for standard bedrooms or small area 15–20 m²
12000+ BTU is what you need for larger living room or open-plan areas 20–30 m²
Energy efficiency
Portable air conditioners can be in use for long periods of time, so it’s important to think about energy efficiency. Look for units with an Energy Class A or A+ rating, which are the most efficient and cost-effective to run.
Features like eco mode, programmable timers, and sleep settings can help reduce energy usage, especially during off-peak hours or overnight. Some models automatically adjust the cooling output based on room temperature, which helps to avoid unnecessary power use.
Noise levels
Because they’re in the room with you, portable air conditioning units will make some noise. If you’re using it in a bedroom, look for models with a sleep mode or night setting that runs more quietly. And check out the product specifications for dB details:
Under 55 dB. Very quiet, good for sleeping.
55–65 dB. Average and manageable noise levels.
Above 65 dB. May be noticeable, especially in quiet spaces.
Additional functions
Look out for handy extras, as a lot of units do more than just cool:
Dehumidifier mode helps reduce moisture in the air on humid days.
Fan-only mode is what you need for light circulation.
Heating mode means you’ll be able to use it all year round.
Some air conditioners can be connected to your Wi-Fi and controlled through an app – very useful if you want to start cooling the room before you get home.
Top portable air conditioners in the UK
Here are some of the best portable air conditioners currently available. Take a look and see which one sounds like the best fit for your space…
Best all-rounder
MeacoCool MC12000RPRO smart air conditioner & dehumidifier
This MeacoCool is a solid choice if you want one unit that can do a bit of everything. It’s powerful enough to cool medium to large rooms and doubles as a dehumidifier – really handy if you’re drying clothes indoors or just want the air to feel fresher.
It runs more quietly than most, so you can keep it on overnight without it disturbing your sleep. There’s also a sleep mode that slowly adjusts the temperature so the room doesn’t get too chilly. And if the power ever cuts out, it’ll start back up where it left off.
Best premium air conditioner
De’Longhi Pinguino EX130CST smart air conditioner & dehumidifier.
If you’re looking for something that’s a cut above the rest, there’s the De’Longhi Pinguino EX130CST smart air conditioner & dehumidifier. It combines powerful cooling with smart features that actually make day-to-day use easier. You can control it through an app or voice commands, set timers, and adjust settings without leaving the sofa. It’s designed for larger spaces and runs quieter than you might expect for the power it offers. It’s definitely a premium option - but if you want something that works hard, looks good, and gives you more control over your comfort, it’s worth it.
Best multifunction air conditioner
Igenix IG9909WIFI 4-in-1 portable air conditioner
This one’s perfect if you want a unit that does more than just cool. The Igenix is a proper multitasker, with four different options - cooling, heating, fan and dehumidifying. That means it’s just as useful on a sweltering day as it is during damp or chilly spells.
It’s easy to set up using the digital display, and the timer is a nice touch if you want it to switch on before bed or shut off once you’ve nodded off. Whether you need a quick cool-down, a bit of warmth, or just fresher-feeling air, it’s got you covered.
Portable vs fixed air conditioners – what’s the difference?
Portable air conditioners are famously flexible and easy to set up. They’re especially popular in UK homes where installing a permanent air conditioning unit might not be possible or practical. For most UK homes, especially flats or rentals, they’re the most practical choice.
Fixed systems offer more power and quiet performance—but they need installation and a bigger budget. They’re a good choice for permanent use in larger spaces or newer homes.
FAQs
Are portable air conditioners energy efficient?
They can be, especially modern models with higher energy ratings and built-in efficiency features like timers, thermostats, and eco modes. While they often use more power than fixed air conditioning systems in large spaces, they’re still a good choice for cooling certain rooms, or for homes where a permanent installation isn’t possible.
How noisy are portable air conditioners?
Noise levels vary by model, but most portable air conditioners operate between 50 to 65 decibels. That’s roughly the sound of a quiet conversation or background music. If noise is a concern, look for units with a "quiet mode" or low-noise operation, especially if you plan to use it in a bedroom.
Do portable air conditioners need to be drained?
A lot of portable air conditioners use self-evaporating technology to handle moisture, meaning they usually don’t need draining under normal conditions. However, in very humid environments, excess condensation can build up, and you may need to manually empty the water tank, depending on the model.
What size portable air conditioner do I need for my room?
Choosing the right size is important for both comfort and energy efficiency. Portable air conditioners are measured in BTUs (British Thermal Units). As a rough guide, a 7,000–9,000 BTU unit is ideal for small rooms up to 20 m², while larger rooms may need 12,000 BTUs or more. Oversizing a unit can waste energy, while undersizing could leave your room uncomfortably warm.
Need more help?
Need more ideas for cooling your space? Check out our article on portable air conditioners: how they work and running costs. Then take a look at our range of air conditioning units, including major brands like Delonghi air conditioners. If you’ve got any questions, feel free to pop in-store and chat to one of our tech experts.
