No that sounds exactly right Iris. And you do not want to be heating their enclosure too much while you're not feeding them. This will cause them to be awake, angry and hungry. The purpose of doing this is to simulate a natural hibernation period where it gets colder, the corns systems shut down, etc. If it's too hot the vital systems of the corn won't shut down and it will just be underfed for 2 months. If your house is too cold for a corn to brumate without heat then how do you live there? Lol. I know I'll probably have trouble finding a place in the house that will stay cool enough (because our winters are very cold here the house heat is on constantly to heat the house).
The main reasons why people brumate their corns are breeding. They seem to have a better breeding response after being brumated than they do if they weren't brumated. Also, it's pretty convienient for alot of people to have their snakes "sleeping" during the busy holiday season (not saying this is the ONLY reason to do it, just that some people find it nice).
You wouldn't want to do it if your corn was sick, underweight, had mites, ticks, internal parasites, etc. You also don't have to do it if you don't want to. Many people keep pet snakes and never brumate them. The snakes are none the worse for wear. Brumation is mainly for breeding purposes in the spring.