Most of the whole-house humidifiers we recommend cost under $300, with freestanding units priced as low as $125. What to ConsiderFirst, check your home’s humidity levels—ideally, it sits around 30 to 50 percent—with an inexpensive digital hygrometer. TypeThere are two main types of whole-house humidifiers: furnace-mounted and console. CoverageThe most important factor to consider when choosing a whole-house humidifier is the square footage of your home. The minerals in the humidifier’s water vapor can gather on surfaces around your home, creating a fine white powder.