If I ever get my own house, I'm gonna make a bed fort that'll be host to the ultimate in comfort, reading and video game playing :3
my laptop alone would eat that area to an uncomfortable level, not to mention all my other gizmos...
although forts are awesome.
Yeah, it ultimately depends on where I live. If north enough, that heat would be more than welcome since sunlight will be blocked and thus natural heat. Also heaters are out of the question due to fire hazzards. However, if in a hotter climate like in the southwest, that's nothing a portable swamp cooler can't fix. Evaporation cooling is very effective and relatively affordable than maintaining air-conditioning costs/unit.