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Aprilaire 4655 Manual Humidifier Humidistat


Aprilaire 4655 Manual Humidifier Humidistat
Retail: $39.99 /ea
You Save: 30%
As low as
Retail: $39.99
You Save: 30%

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Product Information

The Aprilaire 4655 Manual Humidifier Humidistat is a manual humidistat that has to be adjusted based on the outside temperature. This will help prevent water from running down the windows. Also known as part number 4655, this whole house humidistat is designed for low voltage (24v) control of humidifiers in central heating and air conditioning systems to control humidification equipment. Cool air near the windows cannot hold the humidity and water will condense on the glass. In order to prevent this accumulation of condensation, the indoor humidity level is sacrificed by lowering the humidistat.


  • Brand: Aprilaire
  • Model Number: 4655
  • Color: White
  • Manual humidistat
  • Wall-mounted or duct mounted
  • Dimensions: 6" x 3 3/8" x 1 1/2"
  • Fits selected Aprilaire humidifier models

The Aprilaire humidistat control can be mounted on the wall or on the return plenum. A template for the plenum cutout is included. When installing this humidistat for duct mount, locate at least 6 upstream of your humidifier, humidifier bypass ductwork or fresh air intake ductwork. When an increase in relative humidity (RH) expands the nylon ribbon will open the control switch to stop the humidifier's operation. When a decrease in relative humidity reverses the process, the control switch closes.

Compatible Humidifier Models: 

The Aprilaire 4655 is the correct replacement for the following humidifiers:

  • Aprilaire Model 110 Humidifier
  • Aprilaire Model 112 Humidifier
  • Aprilaire Model 220 Humidifier
  • Aprilaire Model 224 Humidifier
  • Aprilaire Model 350 Humidifier
  • Aprilaire Model 360 Humidifier
  • Aprilaire Model 400 Humidifier
  • Aprilaire Model 440 Humidifier
  • Aprilaire Model 445 Humidifier
  • Aprilaire Model 445A Humidifier
  • Aprilaire Model 448 Humidifier
  • Aprilaire Model 500 Humidifier
  • Aprilaire Model 550 Humidifier
  • Aprilaire Model 558 Humidifier
  • Aprilaire Model 560 Humidifier
  • Aprilaire Model 560A Humidifier
  • Aprilaire Model 568 Humidifier
  • Aprilaire Model 700 Humidifier
  • Aprilaire Model 760 Humidifier
  • Aprilaire Model 760A Humidifier
  • Aprilaire Model 768 Humidifier


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