Use Siri to turn on the dehumidifier. Follow this guide to set up the Siri part: https://help.ifttt.com/hc/en-us/articles/360053753113-Use-Siri-to-Run-IFTTT-Applets

This trigger fires when an iOS Shortcut automation is started.

This ACTION will turn on/off the dehumidifier.

Turn on dehumidifier with Siri