Programmer, I posted my PG2C on this forum, you can download it from my signature. However, I recommend you to use Nigel programmer. Both, you may use ICPROG free download.
The problem is not only how to read the ADC of temperature sensors. It's easily done with Nigel's tutorial. But the problem is your control rules. What is your control rules? You cannot use it with linear control, because the fan speed has only some levels and the indoor temperature is never changed so fast as your uC instructions. It needs quite long time to change, and the temperature feedback will never be really "real time". As you accelerate your fan, it need a range of time for the temperature change, and you will see that, when the same number of people stay long time in a room, the temperature will be higher, but it takes time. In that time, people will feel so hot, because the late respond of sensors!
I hope you solved this problem theorily.