The answer to 'what does humidifier do' is a humidifier is a device that adds moisture to the air in your home. Humidifiers work by evaporating water into the air, increasing the humidity level. This can provide several benefits, including reducing dry air that can cause irritation to your skin, nose, and throat, as well as potential damage to wood furniture and floors.
Humidifiers come in a variety of types, from small portable units to whole-home systems that integrate with your HVAC system. They use different methods to add moisture, such as evaporation, ultrasonic vibration, or warm mist. Choosing the right humidifier for your home depends on factors like the size of the space, your climate, and your personal preferences.