Aprilaire 58
Aprilaire 58 Digital Automatic Humidistat w/Outdoor Sensor
No Longer Avilable. Replaced by model 60
  Manual Automatic Automatic Automatic

The Aprilaire model 58 automatic humidistat with LCD display. Includes humidistat, outdoor temperature sensor with 36 inch wire and bracket, manual mode resistor.

Dimentions are 6 x 4ΒΌ". The new Model 58 humidistat control provides comprehensive information:

  • Set-it-and-forget-it control ensures maximum comfort throughout the home - every hour, every day, all season long.
  • The attractive housing color - a light blend of blue and gray creates a subtle presence in the installed environment.
  • Delivers perfectly humidified air to every room of the house, minimizing cold triggers, dry, itchy skin and static shocks.

For some homes, manual control may be preferred. The Aprilaire 58 includes a bypass resistor used to replace the outside temperature sensor.

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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