To effectively use a humidifier, consider your health needs, environmental factors, and recommended humidity levels. Optimal humidity for respiratory health and comfort typically ranges between 30-50%. Different types of humidifiers offer varying moisture outputs and features like humidity sensors and digital displays. Prioritize models with safety mechanisms to prevent over-humidification and mold growth. Regular cleaning and maintenance are essential to maintain optimal performance and prevent health risks. Consult with health professionals for tailored recommendations based on specific medical conditions.