Processors run hot. Batteries produce a significant amount of heat. The engineering of the internal components of the laptop are critical to provide adequate airflow for the fan to do its job and expel the heat from the case, but that is increasingly difficult as manufacturers work to make smaller, thinner notebooks cramming even more heat-generating components into a smaller space.

Thankfully, Intel and AMD have that incorporate more functions onto a single chip. Combining the core processing and graphics processing onto one chip instead of two greatly reduces the power consumption and heat output for newer laptops.