Protect your plants extra with this insulated thermal bag. Large temperature fluctuations will have much less effect in the bag. It is precisely these rapid changes that have a negative effect on the plants. In general, Hoyas are quite cold tolerant, as long as it does not happen suddenly.

There are 2 sizes available. Small 40*30*30 Large 60*40*40For now the price is the same for both sizes. I choose the right size when ordering.
 
As an extra option, a heat pack can be added. This warms the package for a certain period of time.