Seems that every winter I look into my situation and never get around to solving it. I have 2 supply lines in the ceiling and one return down at the floor, in the summer with the A/C running it is just OK and livable in the room. But I am in Wisconsin and the heat is running in the winter, can't run the A/C. The theater room is unbearable warm in the winter, if I leave all the vents closed in then it is OK at the start of a movie but get warms and stuffy with no air moving.
What I would like is some sort of in room A/C unit that I can mount in the utility room next door. Duct the cold air to the theater, and suck return air from the theater. Hot air from the unit would go in the cold air return of the furnace to go back to heating the rest of the house. Water would go down the drain.
Is their any unit like that? I thought about taking apart a cheap inroom unit and build ducts off from it, but don't know if they are really up to the task.