As a Cincinnati resident, investing in a humidifier from a leading brand like Aprilaire is a good idea. With the knowledge of the benefits of a home humidifier in mind, the next step is to understand how to set your humidistat.This easy-to-use control, also known as a hygrometer, allows you to monitor and adjust humidity levels. The Cincinnati winter tends to be frigid as the outside temperature can drop to -10 degrees.Ensure you set your humidistat at 20% for the best outcome when this happens. If the temperature is 0 degrees, your humidistat should be at the 25% mark. Whenever it is 10 degrees, always adjust your hygrometer to the 30% mark.