I have moved your request for assistance with a temperature controlling circuit from the dormant thread to a thread of its own. In future, it is preferred that you establish your own thread rather than append it to an existing thread. This way confusion is avoided and you will receive help consistent with your own requirements.
I recommend that you provide more specific details on your application for a temperature controller. The more information you give us the better we can help you.
Check various temperature sensors from Texas Instruments TMP series, or ADI's TMP/ADT series.
There are bound to be example circuits. In fact, look at the TMP122 from TI; it has an eval board that you can order.