1：The beehives are covered with straw, cotton and other warm materials
Covering the hive with straw, cotton and other items can play a certain heat insulation effect. It is suitable for places where the temperature is not particularly low, and belongs to a primary insulation measure.2：Put straw in the empty space inside the hive
Winter temperature is low, if the free space in the hive is too large, the bees' difficulty in adjusting the temperature is high, which is not conducive to bee insulation. Filling the spare parts with straw reduces the loss of heat, thereby keeping the colony warm. This method is also a basic measure of insulation.Note: The straw used must be dried, preferably exposed to the hot sun.
3：Place cotton clothing in the empty space inside the hive
It's the same principle as the second method. However, cotton is not as good as straw, because there is a hidden danger of bacterial contamination, so it is also necessary to disinfect cotton clothing and dry cotton cloth before use.4：Foam insulation（Inference：https://www.beeculture.com/winter-management/）
- the foam board wrapped in the hive outside, so as to play a temperature insulation effect.
- the foam board stuck in the hive inside the temperature insulation. However, some beekeepers have found that bees particularly like to bite the foam, so when using the foam inside the hive, be sure to wrap it in cotton cloth before using it, or use a board to separate the foam from the bees. The bees should not be allowed to come into contact with the foam.