Thanks folks!
I didn't think about the touring musicians and their constantly changing environments for instruments. I would venture a guess that their special, extremely valuable, or favorite instruments travel with them in whatever vehicle they are using. But, I don't know that as a fact.
I always allow a very slow and controlled acclimation to the room in which I am initially introducing the guitar. The shipping carton or container is not opened for at least half of a day, and sometimes overnight, after arrival. Even the less expensive items (including keyboards and amplifiers) get the same treatment.
I have sent my shipping tips and requirements to the sellers and they are agreeable. They even have some good ideas of their own.. Those requirements are detailed, specific, and numerous. I am sure most of us are well aware of what to do and what not to do when packing a guitar for a possible journey through hell. I am always willing to learn about packing for shipments. I will take the required actions to do it right.
I know that overnight and/or two day shipping would help reduce the possibilities of exposure to extreme temperature changes. However, that is very pricey at the moment but probably worth it.
I am chasing three special guitars right now. A Gibson, a Santa Cruz, and a Guild Orpheum. I have not made any firm commitments due to my concerns about the temperature extremes involved with shipping during this season.
Thanks for the thoughts. It will help me decide what to do.
MD