I have 16 chicks of different breeds Wyandottes, Orpington, and Araucanas all aged 5 weeks old. I live in Georgia our weather is rainy for several days here with night lows in low 50's. They have been outside in their coop for a week. Their coop has 2 levels but I have confined them to one level as the heat lamp is hung in the hole going to the second level. It is roughly 3 half by 3 feet with 2 small windows covered in hardware mesh. Can I remove the heat lamp all together? Raising the lamp isn't an option as the lamp is then too close to the wood and I am worried about a fire. Would they get too cold??