The Orange suit you can see here is not breathable, as it is designed to protect the wearer from chemical hazards, so you can imagine it was a bit like a sauna inside. I was also wearing a full face positive pressure respirator. This constantly blew air across my face and made me feel cool, even if I wasn't, which was quite an odd effect.
As soon as I arrived in the exhibition hall, I knew it was going to be a hot one. It had been quite sunny the day before and the heat had built up alreday. Together with the stand lighting and people, it wasn't going to get any cooler