This is from the Halo web site and they sent me a warning with the juice I got that said the same:
Should I refrigerate my E-liquid?
No. Halo E-liquid should be kept consistently at room temperature for optimal flavor. The flavoring in cold e-liquid tends to separate from other ingredients, significantly reducing the flavor. In addition, if your e-liquid has been left outside in a cold mailbox during winter months, it is highly recommended that you allow it to sit at room temperature for 24 to 48 hours before vaping. This should be ample time for the flavoring to meld back with other ingredients, allowing for optimal results.
And they told me that all NEW e-liquid should be opened then closed and to then let it sit for 24 to 48 hours before Vaping to get the best taste. Not sure if any of this is true with all Juice.
E-liquid FAQ