If you can stand them being inside a little longer, it would be best.I know!! Hoping it all melts away by the weekend. They are getting pretty big and crowded in their brooder so I don’t know if I should wait another week or two or just go for it and put the heat Lamp out there for a while
If you can't, a draft free coop and a heat source would be ok...at 4 weeks, their not fully feathered and can't regulate their temperature yet.