My new batch of 25 Cornish x is arriving on Friday. I've been raising my chicks in the tack room of the horse barn because it is heated. I'm thinking of moving the brooders into the garage this time for easier access. The garage is not climate controlled, temps should be highs in the 80s, lows in the 50s or 60s. They will have a heat lamp. Garage doors are normally open during the day when I'm home, and a fan can be added if necessary. I plan to move them out to pasture in the chicken tractor at 3-4 weeks. Does this sound like they'll be OK? I'm worried about them overheating, if anything.