Big humidification performance to match the biggest homes: the Model 700A. The Aprilaire Model 700 Whole-House Humidifier features truly automatic control, so there's never a need to manually control the humidifier—though it can be installed in manual mode, if desired.

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

The Aprilaire Model 600A Whole-House Humidifier features truly automatic control, plus a built-in bypass damper, which means fewer parts to install. The bypass damper is conveniently labeled for both summer and winter settings, allowing you to set it for the entire season with no guesswork involved. The Aprilaire Model 600A Whole-House Humidifier is simply the best performing bypass humidifier on the market.

• 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

Get big results for small to mid-size homes with the Model 500A Whole-Home Humidifier. The Aprilaire Model 500A Whole-House Humidifier features a built-in bypass damper and is designed for use in small to mid-size homes with automatic digital control for premium performance and convenience.

• Installed in either your living area or central heating and cooling system ductwork
• Comes equipped with a drain to flush minerals from the unit
• Has an evaporation capacity of 0.50 gallons per hour
• Humidifies tightly-constructed homes up to 3,000 square feet in size

Need to maximize your humidity control with minimal water? Choose the Model 400A with automatic digital control.

The Aprilaire Model 400A Whole-House Humidifier features a built-in bypass damper and utilizes new evaporative technology to minimize water use. Gravity pulls water down, while the wicking action of the Water Panel ® draws it back to the top, using 100% of the water delivered to the unit. The Aprilaire Model 400A Whole-House Humidifier:

• Features truly automatic control
• 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.

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