Off-topic Roger question: When a fan runs on a computer too often, what's the best way to figure out what is causing the heat?
If it is a laptop, often heat is caused by a build up a dust between the fan and the cooling vent, which is preventing air flow. Typically this need to clean out every few months. On some laptops, the fan is easily accessible, but on many it's not. If the fan is not easily accessible, I find that the the most effective way to clear the dust is using an air compressor, ideally with a particulate filter, to filter out dust and moisture.
On my HP ProBooks, I use NoteBook FanControl, with custom settings, so that the fan doesn't start running until the computer gets hotter than with the default BIOS fan settings. Also, it could just be excessive CPU use that is causing the fan to run. Task Manager is all you need to have a look at CPU usage and see any process is using a lot of CPU time.