Fans in bouldering

During the last years, we have seen more climbers using a fan to improve the climbing conditions. Lately I have actually heard about guys pushing the limit actually using an air conditioner in order to create cooler temps. In practice this can be taken much further by specifically cooling down big sloopers etc. In theory, you could bring in some industry fans which could reduce the gravity so the question is how far can we take the usage of fans in climbing before it would be called unethical or even cheating? On the picture, Giani Glement is using a portable fan while doing Practice of the Wild 8C (B+).