How much water your whole-house humidifier uses depends on your desired humidity setting and the model you install. Most models use between 1.5 and 12 gallons each day. It’s not enough to notice a significant difference on your water bill, but enough to keep your home comfortable. We recommend keeping your home’s humidity level between 30-60%, which national studies say is the right range for comfort and health.
There are several types of whole-house humidifiers but the most efficient kind is a steam humidifier. These humidifiers heat water in a reservoir to change it into steam. That steam is then distributed through your ductwork either independently or when your furnace is running, depending on the model you have.