You don't have to bring them inside. What's their heating source? Mama heating plate? Or a heat lamp with a light bulb? We put our 2 week old chicks out in the 40s, with a MHP and they did just fine. Chicks will normally cheep constantly for a specific reason: Too cold. Hungry. Some physical distress such as pasty butt, ("OMG I CAN'T POOP!) or they're alone. "I have no flock, where is everyone?" What's your setup for them?Well, nevermind I guess. Apparently it’ll be in the forties tonight so we brought them back in. I should have checked that. Sigh!