The level of humidity in the living space changes with the change in temperature and you really have to watch out for increasing humidity level as it not only has a bad effect on the health of the people but also on the foundation of the building. Humidity offers room for the mildew and mold to grow inside the building. The spores of the mold can cause severe breathing and respiratory problems. In addition to this, they can cause a threat to the foundation of the building if the moisture level is not taken into consideration. They grow inside the walls and weaken the structure.