You meant weeks, right?I know that the chick's will need to live indoor for the first 3-4mo...
I've never raised chicks in the house. The first batch were brooded in the garage until they were 5.5 weeks old then they were moved to the newly finished coop with a huddle box to keep warm.
All subsequent batches were raised in the built in brooder/maternity ward in the coop, most of them under a broody hen. I've had less than 2 week old chicks zipping around outside in 23 degree weather that positively thrived!
If you have too many cockerels, they will over breed the pullets and eventually fight. Fight to the point of serious injury and even kill each other. Or one will be dominant and the other(s) will be submissive and always looking over their shoulders. Even if they get along well, the pullets will still be overbred and stressed and that not only affects their quality of life, it affects laying. I've been through all of this.