1. an instrument that automatically controls humidity levels by turning humidifying or dehumidifying equipment on and off

Examples

• The humidistat in our basement keeps the moisture level at exactly 50 percent.
• When the air gets too dry, the humidistat automatically turns on the humidifier.
• The HVAC technician adjusted the humidistat to prevent mold growth.
• Our greenhouse uses a digital humidistat to maintain optimal growing conditions.
• The humidistat shut off the dehumidifier once the desired humidity was reached.
• Installing a humidistat helped reduce our energy costs by preventing over-humidification.