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House humidifiers are simply units that release water vapor into the air of your home. During the winter months your furnace dries out the air that it heats. A house humidifier remedies that by replenishing the moisture that is lost in the process. A central whole-house humidifier is the most effective way to combat the effects of your furnace during colder months. A central humidifier is incorporated into your forced air system and releases moisture to your entire house every time your furnace kicks on. They are more expensive than table-top units, but do a better job of making your house more comfortable during the months you need it most.