Temps for a Rack System

How do you that use rack systems remain the appropriate temps in a rack system? (esp. Cool side/Hot Side)?

The ambient room temperature is the cool side and flexwatt on a thermostat controls the hot side.

So would I have to get a space heater in my room for the winter months? I live in New Hampshire. Enough said :) haha

Yeah you would. Thats what I do. I use an oil filled radiator that you can buy at walmart. You can hook them up to a thermostat also if you wanted so that it kicked on and off to maintain the pre determined temp.