I live in San Diego and we are getting low 50's at night and over the next few months will get in the mid to low 40's at night. My question is... will my pullets be warm enough in the ark or should I put a blanket or light in it? The ark is open bottomed and they go up into the roosting area at night where they get closed in. It looks just like the Catawba Chicken Ark- thanks in advance.