Oh I don't disagree with your points about heat etc during a race , which starts when you basket your pigeons in the loft , to me it's about how many birds per basket access to water heat in transporter heat when racing home most will lead to dehydration ,thus losses IMHO . But I've been racing out of Geraldy transport for nearly ten years now and there is one thing I've noticed since the change from old type transporter , is the condition of birds when arriving home , years ago I used to see quite a few green droppings in loft after arrivals usually stopped by Sunday , most prob due to lack of water ,dehydration. And to add a point that davie mentioned is that is not aircon , it a small tube with holes in it pointing over the crates that runs full length of every row to reduce heat also ours have roof vents and the shutters are vented to minimise heat . Just an observation ,not a dig . Good luck in your quest ,all the best. Stuart