My chicks are 3-4 weeks old. They are currently in a brooder with a heat lamp on. It’s about 80 degrees. However they are quickly outgrowing their brooder. When is it ok to put them outside in their coop? There are no other chickens in the coop. It gets down in the low 30s at night, would a heat lamp still provide enough heat for them at night? If I can’t put them in their coop, when can I take them outside for short periods of time to play and get used to the outdoors?