Wool’s ability to regulate temperature, insulate and even cool come from two very cool characteristics. The first actually has to do with air. Still air pockets are one of the best insulators in nature. The natural crimp in wool fibers make them stand apart from each other creating millions of tiny air pockets. The impact of laying a wool rug on your floor is like laying incredibly efficient and safe insulation on your floors.
Wool rugs reduce heating and cooling energy requirements by preventing heat loss and preventing heat rising through the floor keeping your room cool and comfortable. If you use air conditioners you will appreciate the insulation on the floors as the cooled air sinks to the floor where you don’t want it warmed by heat rising from the floor.
The other unique feature of wool which helps cool you down is its ability to absorb moisture. Wool fibers are hygroscopic, meaning they readily absorb moisture. Wool can absorb up to 40% of its own weight in moisture and still remain dry. Wool is also not susceptible to mold due to its unique structure.
As they absorb moisture, wool fibers warm up reducing humidity and condensation in the room. Conversely as moisture evaporates back into the air it cools down. This process means less energy is required to heat and cool a room.