TRION's Mister-MINI Humidifers operate by dispersing a fine mist into the warm air supply duct of your heating system. The water is evaporated by the warm air form the furnace and carried into your home by the furnace air flow. The result is improved indoor air quality and increased comfort. The Mister-MINI humidistat and built-in temperature switch automatically control the operation of the humidifer to ensure the proper amount of humidity is achieved. Specifications: Ideally designed for use with fossil fuel fired furnaces , Mister-MINI is equipped to humidify homes up to 2000 sq.ft. , Mister-MINI includes an automatic humidistat that will cycle the humidifer to maintain an accurate and comfortable humidity level. , Push-to-Lock Fittings , watter connections are easy and provide4 simple , worry free operation. Dimensions: 4.24 x 4.25 x 3.88 (HWD) , Power: 24V 2-Year Limited Warranty