Quote:Just to be clear, surely you don't mean 90 °Celsius. That would be 194 °Fahrenheit. If it is 90 °F, I think that should be fine, as they are no doubt getting some of their feathers. How hot does it get with the light on?
If you mean 9 degrees Celsius that is about 48 degrees F and that might be a little cold without the heat lamp. I would still turn it off, like you, because I want the chicks to get used to the dark but as long as they're in the garage and they're away from drafts they will be fine. They will most likely keep each other warm, and you can always put a blanket over most of the brooder to keep out some of the cold.