I live in Miami and fans are an absolute necessity. They are not for keeping your face or head cool. Two tiny fans will not really do anything in that case anyway. They are for avoiding lens fogging. I've tried a MILLION different things to stop fogging. In my last bucket, I think it was just covered with so much dirt and slime that they just stopped fogging. In my new bucket, I discovered that putting two fans near the mouth opening in a pull configuration helps the best. Basically it sucks all the hot air from my mouth and blows it out of the frown. This works over 9000 times better than any system I've used.
Also, voice, meh. I have a wireless mic setup with an aker amp and honestly even when I had it set up I barely ever used it. I used it more with MP3s honestly. I don't even use it anymore.