Here's a basic temperature control circuit using an NTC thermistor. Note your 200 ohms is at 25°C, and has a negative curve as the temperature rises.
The output of the comparator is open collector to ground, and when the temp voltage (set by R1/Rtherm) goes below the temperature set point (set by R_HI/R_LO), the output pulls to ground (to turn on a relay or other device).
Note that R_HI and/or R_LO can be a pot or pot/resistor combination to adjust the temperature set point.
The 392 ohm resistor is not set in stone. I calculated that for a 5K (@25°C) NTC thermistor the best value was 3.92K (actually 3.75K but I had the 3.92K in stock) gave the highest change in voltage for a corresponding change in temperature (do you know calculus?).
Also note that the '339 is a quad voltage comparator, whereas a '393 is a dual comparator.