Automatic CPU Cabinet Cooling System.

https://www.youtube.com/watch?v=QEfKtfDfec0&feature=plcp

plz see this video and suggest me how to improve it more.

i'm using a OP amp and a thermistor for the temperature sensing.
can you tell me how to improve it more?

Looks awfully complex for what it does. Also, I notice the designer doesn't know about hysteresis.

What temperature do you want it to come on at? The surplus stores like Allelectronics usually have a "make-on-rise" button thermostat for a buck or two...