As of 2015, Advanced Heating and Air Conditioning sells four different models of whole-house humidifiers: Aprilaire (two models), TrueSteam and Honeywell TrueEASE brands. A whole-house humidifier is generally connected directly to the house's water supply and creates steam to humidify the home.
Steam generated by a whole-house humidifier is typically distributed through any existing HVAC system and travels through the ducts to reach every corner of the house. The size of a home is the key factor in choosing the correct whole-house humidifier. The Aprilare Model 800, for example, can dissipate up to 23.3 gallons of water per day and humidify a house up 6,200 square feet in size.