The answer to 'humidifier blowing hot air' is that the humidifier is likely malfunctioning and blowing hot air instead of cool mist. This can be caused by a few common issues, such as a faulty heating element, a thermostat malfunction, or a problem with the humidifier's water supply.
If your humidifier is blowing hot air, the first thing to check is the temperature setting. Many humidifiers have a built-in heating element to warm the water before it is dispersed, but this should not result in hot air being blown out. You'll want to ensure the temperature setting is correct and not set too high. If the temperature setting seems fine, the issue may be with the humidifier's internal components, which will likely require professional repair or replacement.