is a low of 60 degrees at night too cold for guinea keets to be in an outdoor hutch? they range from 2-4 weeks old, and they are in with chickens that are probably about 6 weeks old. they all huddle together at night, the smallest one sleeps under the big ones. i will have deep shavings down and put hay in a corner under the little sheltered part of the hutch. is this too cold for them? right now they are in the garage, no heat lamps or anything so i dont know if it will be a huge temp difference, except for wind-which we havent had any of.