Another vote for Ecobee. We have two along with many sensors. Works well with HomeKit and the newest has Alexa built in although it's not the most convenient location for an Alexa speaker/voice controller in a home and reviews say the speaker is suboptimal. (But it's a thermostat, not an A/V component)
Another vote for Ecobee. Went with it over the Nest because of the sensors, and because I got the feeling when I was reading about the Nest that they were trying to be like Apple and force you into their "ecosystem."