The latest version of the Honeywell Lyric (smart thermostat) software now supports HomeKit. What's New in Version 2.1.0 (link to iTunes) Finally! The Lyric hit the market just as I was doing a furnace/heat pump upgrade, so I got it immediately on release (actually went two days with *NO* thermostat for the new system waiting for it to arrive!) I've been waiting for the long-promised HomeKit compatibility for a year and a half now... It added Apple Watch support a few versions ago - although annoying to me is no Pebble support (their "slightly less smart" thermostats do support Pebble, but only for Honeywell accounts based in the EU!) I've got it listed in my HomeKit apps, but or the life of me, I can't figure out how to actually USE HomeKit with it. Asking Siri to change my temperature doesn't work. Edit: Okay, I discovered that only brand-new Lyric thermostats that have the HomeKit logo on the box are compatible with HomeKit - older ones (including shipped as recently as a month ago, according to some online sources,) do not support HomeKit. :-( Edit 2: I posted on Honeywell's forums complaining about the incompatibility with older models. They told me to email them. I did. They're going to send me a new Lyric with HomeKit support. They're telling EVERYONE who posts on their forum to email them, so i gather they're doing this for anyone who asks.