We have 3 chicks who turned 5 weeks today. They are in a spare room in our house that is kept at 70 degrees. I have a 250 watt heat lamp in the room. At what point, do we turn it off? They still sometimes go and sit under it. I worry too about them getting too cold, as they have been sneezing for a week (no other symptoms, well, that this 1st time chicken owner can tell anyway). At the same time, I roast when I am in the room with them and will be happy to turn it off. Any suggestions? Thank you.