This is our first attempt at raising baby chicks. We have 11 of them in a brooder box outside in the garage. We live in Michigan where the temp is still getting down into the 20's at night and up into the 40-50 range during the day. How do you regulate the temperature inside the brooder box? Last night it dipped to 79 and just this afternoon it was at 103 degrees inside the box with a heat lamp.