1) Why did you move him from the warm room to the one he's in now? Have you given any thought to moving him back to the warm room? If he ate in the warm room, but won't eat in the cold room, that might be something to think about.
2) Don't try and feed him so often. It can really stress a picky eater out. Offer once a week, and if he refuses, wait till the next week to try again.
3) Try live.