This is our first go around with rasing chicks this time of year. With it being much colder at night, currently in the 40-50 range, at what point is it safe to put them outside? Is it recomended to provided them with a heat source in their grow out coop? Our batch is currently off of the lamp and are doing fine with inside temperatures in the low 70's, I am concerned with the temperature swing. Previously we have hatched and rasied them in the summer so we could put them out after a 2 weeks. Currently at 5 weeks and the are quickly out growing the brooder.