If and How does Climate Affect Intergrity of Aromatherapy Products?

I am considering ordering AromaHealthTexas essential oils and Petite Fleur Essences for my personal use; however given the intense summer heat I have reservations given that shipping vehicles are typically not climate controlled. 
Can you please explain if and how climate affects the integrity of the oils and essences and if whether any special considerations are used or needed during the shipping process to protect the products?
Thank you.
Gwen L
AromaHealthTexas products are shipped priority mail and arrive safely without heat damage.   It takes high heat over a longer period of time to damage the oils.
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