Honeywell DG115EZIAQ
Honeywell TrueIAQ Digital Automatic Humidistat W/ Outdoor Sensor
No Longer Available.

  Manual Automatic Automatic

The Honeywell DG115 Digital Humidity control of your humidification, dehumidification, ventilation and bathroom fans with Honeywell's TrueIAQ® control. TrueIAQ® automatically adjusts humidity settings and provides maintenance reminders for peak efficiency.


  • Setting changes can be made easily with the touch of a button.
  • Simultaneously displays both indoor and outdoor temperature and humidity levels on-screen.
  • Automatically adjusts inside settings based on outdoor conditions.
  • Include individual air quality enhancements to your system with TrueIAQ, or integrate them all as part of a total air quality system.
  • Intuitive digital backlit display.

Product Specifications

Temperature Range (C) 1.1C - 40C
Includes TrueIAQ control and outdoor sensor for temperature and humidity
Used With Outdoor temp/humidity sensor (included)
Mounting Duct or Remote Mount (up to 20 feet/6 meters)
Used With Whole Home Humidifiers or Dehumidifiers
Mounting Return Duct (Recommended) or Wall Mount
Electrical Ratings 120 Vac, Full Load: 2.0A at 24 Vac, humidifier, dehumidifier, vent contacts
Operating Humidity Range (% RH) 95% RH at 95 F, non-condensing
Voltage 24 Vac
Type Steam Humidifier
Color White

Manual Versus Automatic Humidistat

The indoor humidity level needs to be set based on the outside temperature. This is to prevent water from running down the windows. The cool air near the windows can not hold the humidity and water will condense on the glass. To prevent this condensation, the indoor humidity level is sacrificed by lowering the humidistat.

An automatic humidistat (Aprilaire 60) adjusts the humidity by using an outside temperature sensor.

The Aprilaire manual humidistat as used in earlier Aprilaire humidifiers (Model 4655) requires adjusting the relative humidity based on the outside temperature. A manual humidistat needs to be set back as the season gets colder. The chart below shows the humidity setting for a range of outside temperatures.

When The Outdoor
Temperature is
This Relative Humidity
Should Be Maintained

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