There are pre-made circuits which come with a temperature sensor and can control fan speed to accomplish the same kind of thing. e.g. https://www.amazon.com/gp/

There are pre-made circuits which come with a temperature sensor and can control fan speed to accomplish the same kind of thing. e.g. https://www.amazon.com/gp/product/B077SLWWXL/ https://www.amazon.com/gp/product/B077SLWWXL/