We just acquired some chickens from friends who moved away. One of the hens is acting very broody. But before I set her up with a batch of eggs I want to make certain we have what we need to give her the greatest chance of success. I'm in northern Idaho and the high temps right now are in the 40s, it's damp and chilly. We have a barn and a separate coop. Do I need a heater of some sort or will mama hen keep the chicks warm enough until they're ready to go outside? Thank you!