I took video of mine when I first put them in their brooder home and then again when they were 2.5 weeks old.
I built a wire frame that fit inside the cover the heating pad comes with and it included some legs as well as being arched in shape. I repurposed some old cloth diapers to drape to the floor on 3 sides so any breeze getting in the pop door would be blocked while they're underneath. It's about 38F that first day and I have plastic stapled across the lower half of the big doorway so the wind wouldn't hit them while I was checking on them and filming. It was a little warmer when I took the second video but nowhere near the 70F I often see quoted as the minimum temperature for chicks to have an outdoor adventure.