My thoughts, since you asked and they are probably worth what you paid for them. LOL I put my day old chicks in a custom built brooder box in my enclosed back porch. There are a LOT of windows in that porch and it gets pretty darn cold...probably equivelent to a garage....with a 250 watt red heat lamp. Day olds, mind you. The earliest I have put them out there is around April 15th....it gets pretty warm in the day time and cold in the night. I have the heat lamp pretty low for the first few weeks so they have a nice warm place to go and a large space in the rest of the brooder box to roam around when they have warmed up. When they are 4 weeks old I start turning off the light during the day...which is about May 15th and with the windows it gets warm enough for them to live and thrive. By 6 weeks old they are out with the flock. Live or die, they are outta here. Man are chicks dusty and I just don't need the extra work of cleaning a brooder box almost daily, cuz by 6 weeks it is almost daily that it has to be cleaned.
So, in closing, I say "put them out in the garage now" cuz they are only going to start making bigger and bigger messes in the house.