Aprilaire Automatic Humidifier

AprilAire 700 Whole-House Powered Humidifier – 120V, Automatic Control

The AprilAire 700 is a fan-powered, whole-house humidifier designed for installation in central HVAC systems. With a capacity suited for homes up to 4,200 square feet, this unit uses a built-in fan to draw warm air from the furnace across the water panel evaporator, delivering consistent humidity throughout the ductwork system. Designed for professional-grade installations, it includes an integrated digital control that enables automatic operation based on indoor and outdoor conditions.

System Features

• Built-In Fan: Integrated blower pulls heated air directly from the furnace for improved evaporation and output.
• Automatic Digital Control: Includes an outdoor temperature sensor for accurate setpoint adjustments; displays relative humidity and status indicators.
• Evaporative Capacity: Capable of delivering up to 18 gallons per day under optimal conditions (based on incoming air temperature and relative humidity).
• Coverage Area: Suitable for tightly constructed homes up to 4,200 square feet.
• Continuous Water Supply: Connects to the home’s plumbing via a saddle or standard feed valve; bypass not required due to powered airflow design.

Technical Specifications

• Model Number: 700
• Electrical: 120V, 60 Hz, single phase
• Dimensions: 15.9” H × 15.9” W × 10.3” D
• Plenum Opening: 14-3/4” H × 14-5/16” W
• Weight: Approx. 20 lbs
• Humidistat Type: Automatic with manual override

Installation Requirements

The AprilAire 700 is designed for installation on the supply plenum of forced-air heating systems. It requires a 120V electrical connection, water line, and drain routing. Due to the fan-powered configuration, no bypass ducting is necessary. Professional installation is recommended to ensure code compliance, proper wiring, and accurate placement of the outdoor temperature sensor for automatic control functionality.

Contractor Use Case

This unit provides high-capacity humidification and is ideal for retrofit or new construction projects where furnace-integrated control and automatic operation are preferred. It meets demand in cold, dry climates and includes diagnostic LEDs for service support. The durable thermoplastic housing and replaceable water panel model #35 support long-term system operation and annual maintenance schedules.