winter prep

I have 5 old english game bantam chicks who are about a month old. They're doing great, but I've never raised this type of chicken before so IDK how well they can tolerate the cold. When I take my little blue old english game bantam chick out to mess with her, she shivers. I keep them indoors bc...

Pardon the long winded preliminary explanation. This is my first winter having chickens and my understanding is that they're pretty cold hardy as long as their coop isn't drafty and has good ventilation in order to keep the moisture down. I bought a pre-built 8x10 chicken coop earlier this...