Cooling fans spread to mainstream Android phones, but review questions benefits

The report said fans work well in PCs, laptops and handheld game consoles because those devices have more internal space to move air and larger fans that can push air past large heatsinks. Smartphones have neither advantage, it said, so a small fan can cool only a modest surface area. A phone's thermal challenge is not only cooling the processor but also limiting high temperatures near the user's hand; a fan may help keep heat localized, but it does not guarantee faster cooling inside or outside the device than a well-designed passive system, according to the outlet.

Android Authority said effectiveness depends on the whole thermal design, including how efficiently heat moves from the processor to surfaces exposed to airflow. If the fan provides little airflow or the thermal path is inefficient, it will not make a meaningful difference under significant stress, the report said. Small fans must also run at higher RPM to move as much air as larger fans, which can produce more motor whine and airflow noise. The outlet said every fan-equipped phone it had used was rather noisy and distracting, making the fan noticeable when it starts.

The report said the effectiveness of tiny fans is debatable. Android Authority said it had tested fan-equipped gaming phones in the past and found that turning the fan on or off made little difference to internal or external temperatures when maximizing the GPU. It said a fan could help a phone avoid throttling toward the end of a very long gaming session, but it had not observed a huge difference during 20 minutes of stress testing. The exception cited was ASUS's larger external AeroActive Cooler system. The outlet added that performance-profile software often controls temperatures more effectively than simply toggling a fan.

The report pointed to OnePlus's claim that its fan setup cools the inside of the upcoming Ace 7 by up to 10°C over a long session, saying that could be a genuine breakthrough but that other trade-offs still needed scrutiny. It also raised concerns that manufacturers could use additional cooling headroom to prioritize peak performance over efficiency, potentially increasing heat or reducing battery life. Reports already suggest the latest Snapdragon 8 Elite Extreme Gen 6 chips can run warmer than ideal, the outlet said, noting that 5GHz CPUs carry thermal costs.

Android Authority further asked whether cooling fans might allow some high-power phones to run at more sane temperatures while letting manufacturers scrimp on more expensive vapor chambers. It also questioned whether the growth of phones with fans could encourage chip designers to push the thermal envelope beyond realistic limits. The outlet said it would still be cautious about whether the performance improvements justify the trade-offs.