Temperature control for a small chamber

Hi,

Need to design a heater temperature control loop; for a small chamber, about 1sqft size to a fixed temperature, e.g. 35 C or so. Is there an IC that can read temp sensor and have an output control to drive FETs to control a heater?

Already have PWM controller which is getting its feedback from the CPU, and the CPU read the chamber temperature. I want to make this analog closed loop for simplicity. 

Any thoughts on this?