A small fan worth only a few pounds, sold for seventy
As summer heat presses down on Britain, a wave of online advertisements has been exploiting the very human desire for relief, selling cheap fans dressed in the language of aerospace engineering and miracle cooling. The UK's Advertising Standards Authority has stepped forward to name the deception plainly: devices marketed with NASA credentials and ninety-second room-cooling promises are, in reality, simple swamp coolers worth only a few pounds, sold for up to £120. It is a story as old as commerce itself — urgency and discomfort made fertile ground for those willing to sell illusion — and a reminder that the sophistication of modern advertising can outpace the protections designed to govern it.
- Viral ads on Facebook and YouTube are promising NASA-engineered cooling miracles to Britons sweating through summer, but the devices arriving at doorsteps are little more than glorified desk fans.
- A YouTuber's hands-on investigation exposed the gap between the marketing and the reality — cardboard fins, a trickle of water, and a cooling principle that actively backfires in the UK's humid climate.
- The deception is layered: AI-generated product imagery, fabricated five-star reviews, dramatic invention backstories, and branding inconsistencies all work together to manufacture false credibility.
- The Advertising Standards Authority is issuing enforcement notices and banning offending ads, but without the power to fine, its reach remains limited while the platforms hosting the ads have yet to act decisively.
- Consumers are left navigating the aftermath — those who already paid £70–£120 for a few pounds' worth of plastic have little immediate recourse, even as the watchdog urges vigilance for future purchases.
As another hot weekend settles over Britain, a particular kind of promise has been spreading across Facebook and YouTube: small, sleek devices — rendered in polished AI imagery — claimed to be engineered by former NASA scientists and capable of cooling an entire room in ninety seconds. The Advertising Standards Authority has now issued a public warning that these products are, in almost every measurable way, not what they claim to be.
Stuart Matthews, a civil engineer behind the Proper DIY YouTube channel, bought several of the devices at around £70 each to test the claims himself. What arrived were cheap fans worth only a handful of pounds. One ad had promised a reverse-engineered air conditioning unit with a liquid-compressed cooling cartridge; what Matthews found were cardboard fins dampened by a trickle of water — the basic principle of a swamp cooler. Such devices can work in hot, dry climates, but in the UK's damp air they add humidity while providing almost no meaningful cooling. Unlike real air conditioners, which expel heat through an exhaust or external unit, these machines simply make a humid room slightly more humid.
The deception extends well beyond the products themselves. Advertisements feature fabricated customer reviews describing dramatic temperature drops, copy riddled with grammatical errors, inconsistent branding, and elaborate origin stories designed to manufacture credibility. Prices range from £70 to £120 — a steep markup on components that cost only a few pounds to produce.
The ASA has begun issuing enforcement notices and can ban advertisements that breach its rules, though it holds no power to issue fines. Meta and YouTube have been asked how they plan to address the spread of these ads on their platforms. Matthews expressed genuine sympathy for those caught out: 'I really feel for the people that have been sucked into buying some of this rubbish.' For now, consumers are advised to scrutinise retailer legitimacy, look for verifiable contact details, and seek independent reviews — and those who suspect a misleading ad can report it directly to the ASA, though for many, the money is already spent.
As Britain settles into another sweltering weekend, a particular kind of advertisement has begun circulating across Facebook and YouTube with the kind of promise that should make any reasonable person pause. Small, sleek devices—rendered in AI-generated imagery of copper coils and metallic boxes—are being sold with claims that they were engineered by former NASA scientists and can cool an entire room in ninety seconds. The Advertising Standards Authority has now issued a public warning: these products are, in almost every measurable way, not what they claim to be.
Stuart Matthews, a civil engineer who runs the Proper DIY channel on YouTube, decided to put the claims to the test. He purchased several of these devices, each costing around seventy pounds. What arrived was not a sophisticated cooling system but, as he discovered, a small fan worth only a handful of pounds—cheap components assembled with what he describes as fundamentally flawed science. One advertisement had promised a "reverse-engineered aircon unit" complete with a "liquid-compressed cooling cartridge." The reality was far more mundane: cardboard fins that became wet as water was blown across them. This is the principle behind what engineers call a swamp cooler, a device that does function reasonably well in hot, dry climates but becomes nearly useless in humid environments. The UK, with its damp air and frequent moisture, is precisely the wrong place for such technology. Unlike genuine air conditioners, which extract heat from a room through an exhaust hose or external unit, these machines simply add humidity to the air while providing minimal cooling effect.
The deception runs deeper than the products themselves. The advertisements feature fabricated customer reviews describing dramatic temperature drops and exceptional performance—testimonials that read as though they were written by the same hand, too perfect to be credible. The copy itself often contains grammatical errors and spelling mistakes, inconsistencies in branding, and the kind of dramatic backstory—secret inventions, industry breakthroughs—that should trigger immediate skepticism. Prices typically range from seventy to one hundred twenty pounds, a significant markup on devices that cost only a few pounds to manufacture.
The ASA has identified several warning signs that consumers should watch for when evaluating portable air conditioner advertisements. Claims that sound implausibly good—a small device cooling large rooms rapidly—deserve scrutiny. So do elaborate origin stories and poor presentation. Customer reviews that seem too uniformly positive or read as though they describe unrealistic results should raise red flags. The watchdog recommends that anyone considering a purchase should research the retailer carefully, verify that genuine contact details and a business address are provided, and seek out independent reviews rather than relying solely on testimonials hosted on the seller's own website.
Matthews expressed genuine sympathy for those who have been drawn into purchasing these products. "I really feel for the people that have been sucked into buying some of this rubbish," he said. The ASA is actively monitoring websites to identify misleading advertisements and has begun issuing enforcement notices instructing advertisers to correct their claims. The authority can ban advertisements found to have violated its rules, but it cannot levy fines. Meta and YouTube have been approached for comment on how they intend to address the proliferation of these ads on their platforms. For now, consumers who suspect they have encountered a misleading air conditioner advertisement can report it directly to the ASA's website, though the damage to those who have already purchased may already be done.
Citas Notables
I really feel for the people that have been sucked into buying some of this rubbish— Stuart Matthews, YouTuber and civil engineer
La Conversación del Hearth Otra perspectiva de la historia
Why do these ads keep working if the products are so obviously fake?
Because they're designed to exploit a real problem—people are genuinely uncomfortable in the heat—and they make a promise that feels just plausible enough. A small device that cools quickly sounds like it could exist. The NASA angle adds false credibility.
But a YouTuber tested them and found they were just fans. Couldn't people just do that themselves?
They could, but most people don't. They see the ad, they're hot, they want relief, and they buy. By the time they realize what they've got, the money is gone and the seller has moved on.
What's the actual technology inside these things?
Swamp coolers—machines that blow air across wet cardboard or fabric to cool it through evaporation. They work fine in Arizona or Nevada. In the UK, where it's damp, they just add moisture to the air and barely cool anything.
So the ASA can ban the ads but can't fine the companies?
Exactly. They can tell platforms to take the ads down and instruct advertisers to stop making false claims. But there's no financial penalty, so the incentive to keep trying is still there.
What should someone do if they've already bought one?
Check the retailer's return policy immediately. If there's no legitimate business address or contact information, that's a sign you're dealing with a scam operation. Independent reviews—not the ones on the seller's site—will tell you what you actually have.