As Britain experiences a heatwave, experts are urging consumers to be wary of portable air conditioning units advertised with extraordinary claims, such as cooling a room in 90 seconds and being designed by NASA engineers. The Advertising Standards Authority (ASA) has stated that some companies are capitalizing on the increased demand for cooling devices during hot weather by making exaggerated and misleading claims.

One online advertisement, noted by the Daily Mail, features what appears to be AI-generated video content for a portable AC unit priced at £69. This device is marketed as capable of instantly lowering a room's temperature by blasting cold air and claims to reduce temperatures from 34°C to 17°C in under two minutes. However, customer feedback suggests these devices perform no better than a cheap fan.

YouTuber Stuart Matthews tested a similar cube-shaped device, which cost approximately £80 including shipping. The unit, powered by USB, includes a water reservoir intended to aid the cooling process. Matthews described the device as a lightweight plastic item with a fan and a vent. Despite advertising that promised rapid and significant room cooling, his testing revealed it functioned merely as a fan. He estimated its value to be around five pounds and noted that prolonged use resulted in slight dampness from the expelled water.

YouTuber Stuart Matthews bought a similar cube-shaped device online to test live on camera at home

The ASA highlighted that advertisements for these portable air conditioners often make claims that are "too good to be true." Common issues include assertions that small units can cool entire rooms or homes quickly, exaggerated claims about energy efficiency or cost savings compared to conventional units, and mentions of "revolutionary technology." The authority also warned of potentially fake or misleading customer reviews.

The ASA noted a pattern of such misleading advertisements, referencing similar issues with mini-heaters during colder months. Red flags for consumers to watch out for include dramatic backstories for the products, poor grammar in advertising materials, and inconsistent branding. The Daily Mail has reached out to the companies mentioned for comment.