I order most of my chicks from Meyers. I only had a problem one time, it was late Oct. and I ordered 15 there was no heat pack. It gets cold here. 5 looked dead on arrival. I put them on a heating pad right away, and gave every one a sip of warm yolk water. I also gently massaged their little heads. Only one of the 5 died. I always give arriving chicks yolk water. If I do order in cold weather, I will request a heat pad, even if it costs more.
We have had a really cold cold snap recently and I saw hatcheries were not shipping in that very cold spell which was a good thing.