My rather larger game room for epic sized games is in the garage. After 20 plus years I decided to add AC to the garage and I had to put a wall up in front of the garage door to keep the hot and cold air out or depending on the weather. Even had insulation sprayed in above the garage as well as the entire attic. I also had to replace mr entire VAC and I mean replace everything, $17000 replace thing. So this lead to the upgrade in my game room. Now it’s just a room in my house. Pretty cool. A lot of work though and not cheap. I kept the walls white. Makes it a brighter room.
Before pics. Brick wall hangings covering the garage door.