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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.

If you own a larger home and want the best, then the Aprilaire Model 700 Whole-House Humidifier is the right choice for you.

The Aprilaire Model 600 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 600 Whole-House Humidifier is simply the best performing bypass humidifier on the market.

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

The Aprilaire Model 600 Whole-House Humidifier is simply the best performing bypass humidifier on the market.

Climate Design was professional, fast and great to work with! They thought of things I would have never expected.
–Frank, Falcon