Some tricks to counter hot room training (assuming heat training is not desired).
- As much air flow as possible. More fans than you might think you need even. I run 2 blowers and one circular, on high as soon as I am warmed up.
- Cold drinks to help cool your core temp from the inside.
- Mesh base layer, with cold water dripped on the shoulders, upper chest and entire back. The initial feel of the cold water is refreshing. The rest evaporates and aids cooling for me better than pure sweat and no jersey.