Product Description

Aprilaire 56 AutoTrac Humidistat Controller. Aprilaire duct mount low voltage electronic humidistat. Comes with outdoor air sensor. Can be retrofit installed on any humidifier with a 24 volt AC control system to make it AutoTrac style. Includes installation instructions. This system is so advanced it automatically lowers and raises the humidity setpoint as the outdoor air temperature changes.

The manufacturer is sometimes referred to as April Aire, Aprilair, April Air but is correctly spelled Aprilaire.