Karen, I kept mine in the garage with a heat lamp, but my garage is also heated. I had them in a BIG rubber made bin and shielded them from any drafts. I started them in a box on one side of the bin and expanded their area as they got older. I think the most important thing is to check your peeps 2-3 times a day and adjust the temp as needed. I kept the food side of the brooder covered so they didn't get cold going for food.
I bought my chicks from Urban Farm and Orchards feed.