If your home feels like the Sahara desert during the winter, then a home-humidifier is a must have! Installation is included for Baltimore City and Baltimore, Howard, Carroll, Anne Arundel, and Harford counties. Homeowner must have forced-air heating system and duct work, and furnace must be accessible on all sides. Water piping must be accessible to the furnace room. Humidifier can't be installed in an unheated attic.