I have 12 babies and they are all bantams: wyandottes brahmas sebrights barred rocks easter eggers They are 8-9 weeks old and they're used to approximately 70 degrees 24/7. They will now be going to the outside run and coop where days are low 70s and nights are low 50s (occasional upper 40s). I don't want to use heat unnecessarily because I want them to acclimate as the weather gets colder. But I'm wondering if the night temp change will be a shock to their systems since they're used to constant 70s. I don't want to make them sick, but I need to start acclimating them to cooler temps before it gets really cold. Any thoughts?