Open those windows up again. Chickens do not have any problems with cold air as long as there is no draft and your little coop has ventilation only on the door side, so not to worry.
You can leave the broccoli for two days, carrots too. They will probably have it munched up by then anyway.
You can leave the broccoli for two days, carrots too. They will probably have it munched up by then anyway.