This is not a good thing. It has been found that if you train in high heat conditions, your body becomes acclimatized. Matt Weaver's virtual edge uses a human powered fan, which sucks air in from rear area of fairing and shoots in out the back . I have reservations about training for heat, it doesn't sound like fun, and fun is why I race. The spray bottle works great in low humidity conditions, but in high humidity the effect is lessened.
Fans sound too complicated.
The Barracuda version1 fairing had an air scoop which blew air on my face. This seemed to help a lot, so the search was on for a low drag way to duct some air in to blow on my face. Some fairings utilize a hole in the nose of the fairing, theorizing that it will disturb the air the least there, but the plumbing involved with getting the air to the rider is extensive. I decided to try a NACA duct, which is designed to be low drag, and to place it just in front of the canopy, where a high pressure zone is likely to build. The thicker the surface boundary layer in the area of the duct is, the less efficiently the duct will work.