Almost all composting systems should be shaded from the sun to prevent them from drying out. Ground-based compost piles and bins should ideally be placed on bare soil to allow beneficial organisms to gain access to your bin. But, with the right mix of greens and browns, they will work anywhere, albeit a little more slowly if not on soil. A wormery should be placed in the shade and can be kept in a shed to protect it from extreme weather conditions, and a Bokashi system can be kept in the kitchen. A Green Cone, unlike most other systems, needs to be in a warm sunny spot.