Best Air Coolers

Air coolers offer a more affordable, energy-efficient alternative to portable air conditioning for cooling down during a UK heatwave. They work by passing air over a water-soaked pad, dropping the temperature several degrees through evaporation. The Igenix IG9703 Portable Air Cooler is our top pick. It has the largest water tank on this list, a proven track record with nearly 2,000 UK reviews, and a sensible price for what you get.

Below you’ll find expert reviews of the seven best air coolers available in the UK right now, covering a range of tank sizes, budgets, and use cases from whole-room to personal cooling.

Our Top Picks

7 Best Air Coolers

1. Igenix IG9703 Portable Air Cooler

The Igenix IG9703 has been one of the most consistently recommended air coolers in the UK for several years, and looking at the spec sheet it’s not difficult to see why. The 6-litre water tank is the largest on this list, which means fewer top-ups during a long hot day. Three fan speeds, a 7-hour timer, automatic oscillation, and a remote control cover the basics well without unnecessary complexity.

The LED display is clean and readable, the unit is light enough to move between rooms easily, and the oscillation throws air across a reasonable area. It cools by genuine evaporation, so it works best in lower-humidity conditions — on a typically warm UK summer day rather than a muggy tropical one. At just under £85, it sits in a competitive spot for what it delivers.

Honest note: like all evaporative coolers, the temperature drop is modest compared to a true air conditioner. Expect 3–6°C of cooling in the right conditions, not 15°C. If you’re expecting AC-level cold air, you’ll need a portable air conditioner instead.

Features

• 6-litre water tank — largest on this list
• 3 fan speeds with automatic oscillation
• 7-hour programmable timer
• Remote control and LED display
• Humidification and purification modes
• Castor wheels for easy repositioning

2. Pro Breeze 4-in-1 Air Cooler 5L

The Pro Breeze has the largest review count in this category — over 2,700 — which makes it one of the best-tested air coolers you can buy in the UK. The 4-in-1 functionality covers air cooling, fan-only, humidification, and air purification, giving you year-round utility rather than a unit that sits in the cupboard from September to May. The 5-litre tank keeps it going for several hours between refills.

Three fan speeds, automatic oscillation, and a 7-hour timer are all present, and the LED display and remote make it easy to control from across the room. At £109.99 it’s pricier than the Igenix IG9703, but the added functionality and larger review base may justify the premium for many buyers.

Features

• 5-litre water tank
• 4-in-1: cooling, fan, humidifier, air purifier
• 3 fan speeds with automatic oscillation
• 7-hour timer
• Remote control and LED display
• Ice compartment for extra cooling

3. Midea 5L Air Cooler

Midea is a name you’ll recognise from air conditioning units, and that engineering background shows in this air cooler. The 3-in-1 design covers cooling, fan, and humidification. The 75-degree automatic oscillation distributes cooled air across a wider arc than most competitors, which makes a real difference in larger sitting rooms. Three speeds, a 7-hour timer, low noise operation, and remote control are all included.

At £67.99 it’s the best-value full-size air cooler on this list. The 4.4-star rating from over 300 buyers puts it ahead of both the Igenix and Pro Breeze on average score, and the Midea brand reputation for quality home cooling products is well established.

Features

• 5-litre water tank
• 3-in-1: cooling, fan, humidifier
• 75° automatic oscillation
• 3 fan speeds and 7-hour timer
• Low noise operation
• Remote control included

4. PELONIS 5L Evaporative Air Cooler

PELONIS takes the tower fan form factor and applies it to evaporative cooling, which results in a more space-efficient unit than the traditional boxy air cooler design. The 5-litre tank sits inside a slim upright casing, and auto-swing distributes cooled air without the rotating base that can feel unstable on other models. Two included ice packs can be frozen and dropped in the tank for an extra cooling boost on particularly hot days.

Three-in-one functionality — fan, cooling, and humidifier — and a 7-hour timer round out a solid package. At £109.99 it matches the Pro Breeze on price but wins on form factor if you’re tight on floor space.

Features

• 5-litre water tank with tower design
• 3-in-1: fan, cooler, humidifier
• 2 ice packs included for extra cooling
• Auto-swing air distribution
• 3 speeds and 7-hour timer
• Remote control included

5. EasyAcc Portable Air Cooler Fan 7L

The only battery-powered option on this list, and it earns its place. The 20,000mAh built-in battery delivers up to 116 hours of runtime on the lowest fan setting, which makes the EasyAcc genuinely useful for camping, outdoor events, or rooms without a convenient mains socket. The 7-litre tank is the largest here, and a misting spray function adds an extra layer of cooling beyond pure evaporation.

At £59.49 it’s also the most affordable option on the list. The 858 UK reviews at 4.4 stars suggest buyers are largely happy with the real-world performance. It’s not a replacement for a full room cooler in a bedroom, but as a personal cooler for the garden, a tent, or a home office desk it’s a genuinely useful product.

Features

• 7-litre water tank — largest on this list
• 20,000mAh battery — up to 116 hours runtime
• Misting spray function for extra cooling
• 3 fan speeds
• Remote control included
• USB-C charging for portability

6. Igenix IG9706 Evaporative Air Cooler

The IG9706 is Igenix’s updated follow-up to the IG9703, and it refines the formula in a few areas. The housing is slightly slimmer, the controls are cleaner, and the LED display has been updated. It carries the same core spec — 3 fan speeds, oscillation, 7-hour timer, remote control — but steps down to a 5-litre tank to achieve the more compact profile.

At £79.99 it sits between the IG9703 and the Midea on price, offering the trusted Igenix brand in a more modern package. If you prefer a newer design and don’t need the 6-litre tank of the IG9703, this is a natural upgrade choice within the same range.

Features

• 5-litre water tank
• 3 fan speeds with oscillation
• 7-hour programmable timer
• Remote control and LED display
• Slim, updated design
• Humidification mode

7. KLARSTEIN 6L Evaporative Air Cooler

If you’re looking for the most capable evaporative air cooler on this list in terms of pure airflow performance, the Klarstein is the one. The 320 m³/h airflow rating is notably higher than most of the competition, and the 360-degree oscillation covers an entire room rather than the 75–90-degree arc typical of most units. The 6-litre tank matches the Igenix IG9703 on capacity.

The premium comes in at £169.98 — the most expensive on this list by a significant margin. A 4.9-star rating from 28 early buyers is promising, though the review count is still building. For a permanent summer cooling setup in a living room or bedroom where you want the best performance available, the Klarstein makes a compelling case.

Features

• 6-litre water tank
• 320 m³/h airflow — highest on this list
• 360-degree oscillation
• Remote control and timer
• Multiple speed and mode settings

Air Cooler Buying Guide

Key Takeaways

• Evaporative air coolers work by drawing warm air through a water-soaked pad: evaporation absorbs heat from the air and lowers its temperature by 3 to 8°C before blowing it into the room
• They work best in dry conditions (humidity below 50%) and lose effectiveness quickly as humidity rises. On a typical muggy UK summer day, the cooling effect is limited
• Running costs are very low: most units draw 40 to 100W, costing around 11 to 27p per hour at UK electricity rates, compared to 250 to 1,000W for a portable air conditioner
• Water tank size determines how long the unit runs between refills: a 5L tank typically lasts 4 to 8 hours; a 10L tank gives 8 to 15 hours of continuous use
• Ice packs or ice water in the tank enhance the cooling effect on very hot days, dropping air temperature by an additional 1 to 3°C
• Unlike air conditioners, evaporative coolers add moisture to the air and require no exhaust hose, making them genuinely portable and easy to use anywhere with a plug socket
• Regular cleaning of the cooling pads and tank is essential to prevent mould and bacteria buildup, particularly when stored between seasons

What Is an Evaporative Air Cooler?

An evaporative cooler, also called a swamp cooler, uses one of the most energy-efficient cooling methods available: the physics of evaporation. When water evaporates, it absorbs latent heat energy from the surrounding air, reducing its temperature. A fan draws warm room air through water-saturated cooling pads, causing rapid evaporation. The resulting air is cooler and slightly more humid, and is blown back into the room.

The technology is simple, reliable, and uses a fraction of the energy of a refrigerant-based air conditioner. The trade-off is that it adds moisture to the air, which makes it counterproductive in humid conditions, and its cooling capacity is more limited. Think of it as a significant step up from a fan, but a different category from a true air conditioning unit.

How Effective Are They in the UK?

Effectiveness depends almost entirely on the relative humidity of the incoming air. In dry conditions (below 50% relative humidity), an evaporative cooler can drop air temperature by 5 to 8°C, which is a meaningful improvement in comfort. In humid conditions (above 70%), the air is already carrying so much moisture that little evaporation occurs, and the unit may only drop temperature by 1 to 2°C while making the air feel clammy.

In the UK, summer humidity varies considerably by region and day. During a dry heatwave, particularly in the south and east of England, evaporative coolers can work very well. During the more typical warm, overcast, or lightly rainy days that characterise British summer, their effect is modest. They are best thought of as a high-value tool for the handful of genuinely hot, dry days each year, rather than a substitute for air conditioning in a consistently warm climate.

Choosing Tank Size and Airflow

Two specifications drive most purchase decisions for evaporative coolers: tank capacity and airflow measured in cubic metres per hour (m³/hr).

• Tank size and runtime: A 3L tank suits desk or bedside use with refills every few hours. A 5L tank is the most common for portable room units, typically running 5 to 8 hours on medium speed. Larger 7L to 10L tanks are designed for longer unattended operation or larger rooms
• Airflow (m³/hr): For a small bedroom or office up to 10m², 200 to 400m³/hr is sufficient. For a 15 to 20m² living room, look for 500 to 800m³/hr or more. Underpowered airflow means the cooled air doesn’t reach across the room effectively
• Fan speeds: Three or more fan speeds give you control over noise and airflow. Low speed for quiet night-time use; high speed for maximum cooling during peak heat. Natural breeze modes that vary speed automatically are a nice touch for daytime use

Features Worth Looking For

• Oscillation: Rotating louvers spread cooled air across a wider area rather than directing it at a single spot. More useful in larger rooms or when you want the cooling effect shared across the space
• Remote control and timer: A 24-hour timer lets you set the cooler to switch on before you wake or return home. Remote control avoids having to cross the room to adjust settings
• Ice compartment: A dedicated tray above the water tank that holds ice packs or ice cubes. As the ice melts, it chills the water feeding the cooling pads, temporarily enhancing cooling output. Effective for 1 to 3 hours on a very hot day
• Humidity control: Some models include a built-in hygrometer and automatically reduce output when humidity exceeds a set level. Prevents the unit from making a humid room worse
• Washable or replaceable cooling pads: Honeycomb cellulose pads are the most effective and the most common. Check the availability of replacement pads for your model before purchasing, as they degrade over time

Running Costs

Evaporative coolers are among the cheapest appliances to run. A typical unit drawing 60W costs around 16p per hour. Even a large 100W unit costs only 27p per hour, around a quarter of what a portable air conditioner would use to cool the same space. Over a summer of occasional use, total electricity costs are modest.

Water consumption adds a negligible cost. A unit evaporating around 0.5L per hour uses roughly £0.001 worth of tap water per hour, which is not worth factoring into your calculations. Filter pad replacement (usually once a season at £5 to £20 depending on model) is the only notable maintenance cost.

Maintenance and Hygiene

Evaporative coolers need more maintenance than most home appliances. Standing water in the tank is a breeding ground for bacteria and mould if left unchanged. The general guidance is:

• Empty and refill the water tank every 1 to 2 days during active use
• Clean the tank with a mild antibacterial solution weekly
• Remove and rinse the cooling pads monthly, or replace them at the start of each season
• Before storing at the end of summer, drain completely, clean all components, and allow everything to dry fully before reassembly. Storing with damp pads creates mould that’s difficult to eliminate

Things to Keep in Mind Before Buying

An evaporative cooler is not a replacement for an air conditioner, and being honest about this upfront avoids disappointment. If you’re in a humid climate, have a south-facing room that stays warm even at night, or want to cool a room to a specific temperature regardless of outdoor conditions, a portable air conditioner will serve you better despite the higher running costs.

Where evaporative coolers genuinely shine is supplementary cooling on dry days, desk or bedside cooling for personal comfort, and outdoor or semi-covered areas like a workshop or garage where a standard AC wouldn’t be cost-effective. In those contexts, the low running cost and zero-installation simplicity make them excellent value.

Case Study: Cooling a Home Office Through a UK Heatwave

Background

A freelance designer working from home in a converted loft bedroom in Bristol found her home office regularly reached 30°C+ during the 2023 and 2024 heatwaves. A portable air conditioner was ruled out due to no suitable window for an exhaust hose. Budget was under £100.

Project Overview

The goal was to make the workspace comfortable during peak daytime heat from 11am to 4pm on heatwave days without exceeding a £100 budget. The room was approximately 12 m², well insulated, and south-west facing.

Implementation

An Igenix IG9703 was placed on the desk corner, positioned to blow cooled air across the sitting area. A north-facing window was opened to allow air circulation without introducing additional heat. The cooler was run on medium speed with the tank filled with cold tap water each morning. On the hottest days, a small bag of ice was added to the water tank around midday.

Results

The ambient temperature in the direct airflow zone dropped by approximately 4°C on medium-humidity days and 2–3°C on more humid days. The workspace became consistently comfortable on all but the most extreme days. Running costs were negligible — under £0.05 per hour based on the unit’s 70W consumption at the UK electricity rate.

Expert Insights From Our Heating Engineers About Air Coolers

One of our senior heating engineers with over 15 years of experience in home climate control had this to say:

“The biggest source of dissatisfaction with air coolers is wrong expectations. People buy one expecting air conditioning and then feel let down. An air cooler is more like an enhanced fan — it’s genuinely effective for personal cooling and takes the edge off a warm room, but it won’t drop your entire living room temperature by 10 degrees.

“Where they really shine is in bedrooms overnight. The low energy consumption means you can run one all night without worrying about the electricity bill, and the gentle cooling effect is often enough to make sleep comfortable during a UK heatwave without the aggressive chill of an air conditioner.

“The one practical tip I’d always give: place the cooler so the airflow blows across your body rather than into the room generally. You’re cooling yourself, not the air. Position it at your level, pointed at where you sit or sleep, and the perceived cooling effect is much more noticeable.”

Frequently Asked Questions

Summing Up

The Igenix IG9703 is our top pick for most buyers — it has the largest tank, the strongest review count, and a proven track record at a fair price. For the best value, the Midea 5L delivers a strong spec at £67.99. If you want something battery-powered for outdoor use or camping, the EasyAcc 7L is in a category of its own.

Remember that air coolers work differently to air conditioners. Position yours to blow cooled air directly across your body, open a window for circulation, and manage expectations accordingly — used correctly, they make a genuine difference to comfort on a warm UK summer day.

Updated May 2026