It should be. My case is real cool to the touch even when my room is warm. I think spacious room allows efficient cooling by preventing heat buildup.
It could be my case though. It's all aluminum and the PSU has its own air intake from the side. 4 low speed fans most likely contributed to it as well. It's a good design.
To be honest, I didn't think it was this big but I'm glad I got it.
This is the inside after removing the rail and the bays. The mATX mobo gives you the idea of the size.
After full assembly and leaving out a bay.