Does Amazon's £6 Fan Mister Really Turn Your Fan Into an Air Conditioner?

The £6 Amazon “fan mister” doing the rounds this heatwave will not turn your fan into a real air conditioner — but for the price of a meal deal it can give you a genuine, if localised and short-lived, cooling boost. The viral clips make it look like free air con; the physics is more modest. Here’s exactly what the gadget is, the evaporative-cooling science behind it, whether it actually cools a room in a muggy UK heatwave, and how it stacks up against a proper portable AC.

What is the £6 Amazon fan mister?

It’s a cheap add-on that clips onto a normal fan and is marketed as a way to “turn your fan into an air conditioner.” Two budget versions are doing the rounds at around £5–£6:

• Water-mister attachment — throws a fine water mist into the fan’s airflow, so the breeze carries cooling droplets.
• Ice-pot attachment — a small clip-on case with freezable pots; you freeze them, clip them on, and the fan blows over the ice. Listings typically claim four to six hours of cooling. It’s the “bowl of ice in front of a fan” hack, productised.

Both are evaporative or ice tricks bolted onto a fan you already own. Neither contains a compressor or refrigerant, which is the part that makes an air conditioner an air conditioner.

How does a fan mister actually cool you?

Through evaporative cooling. When water turns from liquid to vapour it pulls heat out of the surrounding air and off your skin — that’s why stepping out of a pool feels cold. A mister breaks water into tiny droplets that evaporate in the fan’s airflow, so the breeze hitting you feels several degrees cooler.

The catch baked into the physics: it works best when the air is dry. The drier the air, the more readily the mist evaporates and the bigger the cooling effect — which is why misting fans are brilliant on a desert patio or at an outdoor event.

Does it work indoors during a UK heatwave?

Partially — and less than the listings imply. Two things hold it back:

1. UK heat is often humid. When the air is already damp, the mist evaporates poorly, so you feel much less cooling. Worse, the un-evaporated water settles on you, the furniture and the floor, leaving things clammy — and, if you overdo it indoors, that moisture is a mould risk.
2. It cools you, not the room. A mister or ice-fan gives an immediate cooling sensation in the draught. It does not meaningfully lower a room’s overall temperature, especially in a larger space. Step out of the breeze and the heat is still there.

So as a personal, sit-in-front-of-it cooler it can genuinely take the edge off — particularly on drier hot days. As a whole-room “air conditioner,” it simply doesn’t deliver.

Fan mister vs a real portable air conditioner

This is where the “turns your fan into an air conditioner” line falls down.

A real portable air conditioner has a compressor that pulls heat out of the room and vents it outside through a hose, and it dehumidifies as it runs — so it actually lowers the temperature and dries the air. A £6 mister does the opposite on humidity and can’t shift a room’s temperature at all. The trade-off is cost and power: the mister is a few pounds and sips electricity, while a portable AC is typically £200–£500+ and draws far more.

Is the £6 fan mister worth buying?

With the right expectations, yes. For around £6 it’s a cheap way to make a fan feel cooler at your desk, your bedside or outdoors — best on drier days, and best aimed straight at you. Just don’t expect it to cool a room or replace air conditioning.

If you specifically need to bring a room’s temperature down, that’s a job for a proper unit (see the portable AC guide above). And if you’re just after cheap heatwave kit, there are other budget options worth a look — see our roundup of Aldi’s budget air cooler and best cheap fans.

How to use a fan mister safely

Water and a mains-powered fan need a little care:

• Attach, detach and refill with the fan switched off and unplugged.
• Aim the mist at the airflow, not the motor, plug or socket — keep water out of the electrics.
• Wipe up any settled moisture so floors don’t get slippery and surfaces don’t stay damp.
• Battery or USB handheld misting fans sidestep the mains-water risk entirely and are fine for personal use.