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Possible reasons a duct mount humidifier may not be desirable: * such a system is prone to mold growth in the home duct work* an individual renting (non-owner) may not wish to install such a unit* a home which does not have a centralized heating system.A void in the marketplace clearly exists for self filling humidifiers which do not mount to the home furnace duct work. Here we list what products we have found that are available, and close approximations or substitutes.== Aprilaire Models 350/360 Whole-House Humidifiers ==These are self contained units which can be mounted in a closet or area and vent out through an opening which requires construction modification of the home. This unit is not portable, as it is designed to be permanently mounted in the home. * [Manufacturer Web Site Product Information http://www.aprilaire.com/index.php?znfAction=ProductDetails&category=5&item=350]== Defensor PH15 Auto-fill Evaporative Humidifier ==This is a portable unit with an optional water line connection. This product appears to be available only in the U.K. / Europe.== Do-It-Yourself Option ==See this [http://www.instructables.com/id/Easy-Auto-Fill-Humidifier/?ALLSTEPS Easy Auto Fill Humidifier] DIY instructional guide. This may not be practical for many families.== JS Humidifiers ==JS Humidifiers has a portable humidifier and air purifier modem that can be connected to a water line. Again, this appears to be available in Europe.* [press release http://www.jshumidifiers.com/new-economical-mobile-humidifier-29-news/]