This is a circuit that uses a thermistor to turn on a fan when a certain temperature is exceeded. This video contains the actual testing of the circuit, the components list, and the schematic diagram of the circuit. We used this as part of our project which also included a heating system which turns on when it goes below a certain temperature and it comes with an LCD to display the current temperature of the room.
-comment your email add if you need help to make this, i can send you my project document. 
Post time: Jun-05-2017