Phone coolers are devices designed to dissipate heat from smartphones, preventing performance degradation. When a phone's CPU and GPU are under heavy load, they generate heat, which can lead to thermal throttling where the phone reduces its performance to protect components. Active cooling can help maintain sustained performance by keeping temperatures lower.
The market offers various phone cooling solutions. Basic models use fans to circulate air, while more advanced thermoelectric (Peltier) coolers actively draw heat away with a cold plate. Passive cooling cases distribute heat over a larger surface area. Software-based 'cooling apps' attempt to reduce workload but cannot physically remove heat.
External cooling can measurably improve performance stability under heavy loads. For example, tests on the ASUS ROG Phone 8 Pro showed 3DMark stability scores improving from around 77-79% without a cooler to 90-92% with the AeroActive Cooler X attached. This indicates that coolers can prevent frame rate drops when a device heats up during intensive tasks.
While effective, phone coolers are not necessary for the majority of smartphone users. Their primary benefit is for individuals who engage in sustained, demanding activities such as extended gaming sessions, livestreaming, video processing, or prolonged outdoor photography in warm conditions. These scenarios are where heat buildup is most likely to cause noticeable performance issues.
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Phone coolers can prevent performance degradation caused by heat during sustained heavy use, such as long gaming sessions or video processing. However, most users do not push their phones hard enough for long enough to experience significant thermal throttling, making these devices largely unnecessary for the general public.