Huel RTD can be stored at room temperature or in a fridge (in fact it’s nicer when drunk chilled). The process and aseptic bottling method ensures it will meet shelf life and that there will be no degradation of vitamins and minerals over this period.
Powder - should ideally be stored at room temperature, but if this is chilled there is no problem. However, you might expect some degradation on some nutrients if powder is stored warm