Hey Jamie,
I've seen troopers with and without fan kits. I think it depends on a few things .. (1) Are you a "hot" person, that gets warm easy, and (2) how large is your head opening in the bottom of the helmet(how much fresh air/ventilation can you get)?
I run the Evilboy fan set-up in my TK bucket. I found it very hot in there without it. The fans keep me cool and help prevent my lenses from fogging up. I wear glasses in my bucket too.
My helmet retains a bit of heat because I kept my helmet opening (for slipping my head in and out) as small as possible, and I have the mesh behind the teeth.
I don't wear a balaclava, but do wear a headband. There are a few other threads on this topic on FISD & I'd search them out. You'll find great pics of peoples set-ups if interested. Hope this helps.