I live in a very hot part of Australia, when im not home, and theres no air conditioning on, it would be over 30 degrees inside my house.

Im wondering if I should keep my products in the fridge? I tend to buy the largest size products, as I have big shipping costs.

Yes if you live in a very humid or hot climate, we strongly suggest that the products be kept refrigerated.

Hot/humid weather definitely affects these products since little preserving agents are used.