Do yourself a favor and use free 'Macs Fan Control' app (google for it), it supports all apple hardware on Windows and also Mac. Yngwiewho1 Posted Great program! Does exactly what it says.
If you are worried about your Macbook overheating then Fan Control is for you, it’s a tool that lets you adjust the speed that the computer's fans are turning at, helping you avoid temperature increases. In the shape of a preferences panel, Fan Control lets you set the standard turning speed, as well as the upper and lower limits that the program will work with.
See the graph that Fan Control creates to find out if your computer is overheating. The green line represents temperature, and the blue line represents the speed that the fans are turning at.