A new support document confirms the long-standing rumor that Apple TVs (third-generation or later) will allow users to control HomeKit devices using Siri even when they’re away from home. Devices running iOS 8.1 or later will be able to control HomeKit devices locally after downloading an app for each family of devices and entering a unique HomeKit code.
After setup, Siri will be able to control the HomeKit products inside the house, but the iOS device may need to be unlocked when giving commands to certain products. For Siri to control a user’s home remotely, the same Apple ID will have to be logged in on the user’s iOS device and an Apple TV running software version 7.0 or later.
For HomeKit devices to be grouped, they’ll need to be configured through the same third-party app before Siri can control them as a unit. The document includes a link to HomeKit compatible products and instructions for reconfiguring your HomeKit settings if you move or lose the device you use for control.