I would suggest getting a wine cooler or small refrigerator. Ideal storage for most fragrances is 10C. or 53F. Citrus fragrances store better at 8C. Considering most of our investments in fragrance it is a small cost indeed to get one, usually $110 or less. Set up the refrigerator to a fairly constant temperature as outlined above before storing the fragrances therein. This works well for me since it gets quite hot here in summer. As for your question about short term storage where there has been higher temperature, I am not an expert, but, if the fragrances still smell true then storing at the correct temperatures should keep worry away. Good luck and best regards.