We've used the Gerald'y crates for years now ,prob the first in Scotland to get them ,us glasgow and southl anarkshire , and yes they are brilliant well designed transporters yes they have air con , easy to keep clean , but comfort for pigeons , cardboard against. Deep shavings , I know what I would like to sleep in, but the condition of the birds returning from racing from Gerald'y transport is second to none , prob because they can see and get to the water easily. Plus remember the convoyers must do the job right .