Goods should be kept at a temp less than 25c.
It is also worth noting that the goods should be warehoused away from external walls that will hold heat overnight and if possible keep the goods away from the top two tiers of racking.
Shops will store goods in windows and this direct heat source will cause an issue for the DHA encapsulant. Whilst we do not store the goods in a controlled environment due to the short time products is traditionally here, we monitor the room to ensure extreme heat is not encountered.
It is best to remember that all your competitors have similar issues dealing with distributors and it may be best to keep small volumes of stock in parties that you have not audited and have regular inspections with to ensure that the product, whilst not needing refrigeration, is kept in a stable temperature.