Keeping Rack Temps

How do you maintain temperatures on a rack when you don't have a special "reptile room". I keep mine in my bedroom. Do you put UTH's on every shelf? Teach me about racks please...

For rack systems, people normally use flexwatt, there's a great video of how to do it here:
http://www.bigappleherp.com/Flex-Watt-Heat-Tape
There are other alternatives but I have found that this is the most common method and it also seems like a great method for your situation. (:
Do more research on it if you're interested, look at how to build a rack and such, flexwatt is usually included in the tutorial.