My silkie is outside with her four chicks and it's been getting down to the 30's and even snowed. The chicks are just two weeks and play away from mom in the cold weather. So you don't have to worry about the temperature. Mom will teach them what water and food is. Just relax keep an eye out for mama and let her do her thing. Chicks have two or three days that the yolk is absorbed into their bodies which give mom more time to sit on the late hatchers. My four hatched within three different days. One the first day, another the second, and two on the last. By the time the last one dried off she was teaching the others to eat and drink. You'll hear her cluck to them when she's got food or water for them. They eat just like her(she doesn't put food into their mouth) pecking at the chick food and water. The space heater might actually make them too hot. Just trust her and have a back up plan if you notice odd behavior from her.