48 x 72 feet ...or inches?I used a heat lamp. I took them off it a few days ago. I only turn it on when it freezes. my coop 48'x72' I only have four birds. That should be plenty of space.
Going to assume it's 48" x 72" or 4' x 6'.
Should be good for sleeping and laying, but not for any severe weather, a secure and weather proofed run would be a huge asset.
Are you ready with something to keep water thawed in the coop?
Not a great idea to have a heat lamp in a small coop.
I also assume you are in Oklahoma by your screen name?
Here's how to add your general geographical location to your profile.
It's easy to do, (laptop version shown), then it's always there!