Text Box: The Aprilaire Model 600 Whole-House Humidifier: Features the same performance benefits of other Aprilaire Humidifiers Delivers up to 50% more moisture in comparison to competitive units Has an evaporation capacity of 0.70 gallons per hour Humidifies tightly-constructed homes up to 4,000 square feet in size Text Box: Complementing any central heating and cooling system, the Aprilaire Model 700 Whole-House Humidifier: Utilizes an outdoor temperature sensor for monitoring even the slightest changes in outdoor temperature Delivers up to 50% more moisture in comparison to competitive units Has an evaporation capacity of 0.75 gallons per hour—among the highest capacity humidifiers sold Humidifies tightly-constructed homes up to 4,200 square feet in size Text Box: Need to maximize your humidity control with minimal water? Choose the Model 400 Text Box: Eliminates standing water, making it the perfect choice for homes with septic systems, locations where a floor drain is not available or families interested in water conservation Has an evaporation capacity of 0.70 gallons per hour Humidifies tightly-constructed homes up to a 4,000 square foot in size. Text Box: Big humidification performance to match the biggest homes: the Model 700. Text Box: Want the perfect humidity level for any season? Take a look at the Model 600.