Pennsylvania's winter runs from November to April, snow falls vary from "18 to 150 inches of snowfall" depending on location. Temperatures are typically below freezing sometimes reaching -5F or lower.
I agree with the comment above regarding size vs number of chickens however, will try to answer some of your questions. I have been through overcrowding in a coop - you and your chickens will not be happy!!
"deciding if food is kept in or out. What's better?"
Everything you put inside the coop...