Hope they're not on the cement. My fully grown chickens(over a year) are in our garage with straw on the floor and a wood box coop to get into. But I live in Wisconsin. It's been really cold here. On the cold days they stay in the coop more even though there's no breeze coming in.
Do they have...
I sweet talk my girls whenever I'm in their area. I also mimic the sounds they're making. My husband and I are in with them many times a day. But I also think the breed makes a slight difference. I used to have Rhode Island Reds. They were nice enough; but my Buff Orpintons are the nicest...
The only bad part about using heat in the coop is a power outage. That's why I use the larger flaked pine instead of sand-it's too cold here (10 degrees last night). A number of articles I read stated that if you're going to use a heat source, you should have a generator for back-up...otherwise...
They really can't eat the larger flaked pine bedding. They may peck at it and pick it up, but it's too big for them. I started with the smaller shavings when they were babies, but saw that they could eat. I also use straw for the outer area of my enclosure. I moved my chickens to our sun porch...