Aprilaire humidifier causes condensation on windows and walls.

Safety first: No internal electrical work is required for basic adjustments.

• Lower setpoint: Reduce the humidity setting according to outdoor temperature (e.g., 30–35% when below freezing outside).
• Enable automatic mode: If using an Aprilaire automatic control, ensure the outdoor temperature sensor is connected and the control is set to Automatic mode so it can adjust humidity based on outdoor conditions.
• Relocate humidistat: If the control is in a damp area (kitchen, bathroom), relocate it to a representative location or use a return-duct-mounted sensor.
• Check wiring: Verify the humidifier is not wired to run continuously regardless of control (no permanent jumper across control terminals).