Using a fan is the most common method of cooling, however it is not always the most practical or elegant. Fans are usually not very practical, although there are portable fans, they are usually not very elegant to carry around and can run out of battery in less than a day of use. They can also be quite noisy and disruptive, which can put people off using them when trying to sleep even if they feel hot.
The ideal method of cooling would involve a device that does not have to be held, and can provide discrete cooling at all times. This can be in the form of a wearable on one of the places of our body that produces the most heat.
One method of cooling is the Peltier effect, which absorbs heat when an electric current passes through a junction. If this could be small enough to be worn and also have enough power to run wirelessly for about a day, then it can prove to be an alternative cooling method. As it will have no moving parts, it will have a silent operation and be more efficient than a fan. It could also be useful when exercising and could even be built into smart watch bands and be powered by the watch. This device can also potentially be connected to the watch itself, via bluetooth, to set the temperature we want.
There are potential problems, such as the safety of passing an electrical current on or near the surface of the body, and the effects when in contact with water.
As always if you think you have a solution or if you have a problem you would like me to try to solve then please feel free to comment it.