the lights are kept on are they, and you still could not see your hand infront of your face, and with no through air it will get like a bakers oven, and if the lights are kept on when do the birds get to rest, as we all know they do need to rest,
i am sure davie is doing his best, it is the building thats the problem what about proper ventilation also the birds would be better in wire crates than aluminium ,