Humidifiers are beneficial for improving indoor air quality, especially during cold winters, but they can also become sources of mold and bacteria if not properly maintained. Research indicates that stagnant water in humidifiers can lead to the growth of harmful microbes, including bacteria associated with respiratory illnesses and mold species like Aspergillus and Cladosporium, which pose risks to individuals with asthma or weakened immune systems. To prevent these issues, it is essential to adopt daily habits such as changing the water regularly and conducting thorough cleanings at least twice a week. Experts recommend using white vinegar and hydrogen peroxide for effective cleaning, while diluted bleach can be employed for more severe contamination. Additionally, using distilled or demineralized water can help minimize microbial growth. Maintaining indoor humidity levels between 30-50% is also crucial, as levels above 60% can encourage mold growth throughout the home. By following these guidelines, humidifiers can remain a reliable source of comfort and health in the home.