(not OP, but I also use HA) The important bit is to have an open API that can be connected to from the local network (or via Matter + Thread, etc), and via a c

(not OP, but I also use HA) The important bit is to have an open API that can be connected to from the local network (or via Matter + Thread, etc), and via a cloud. Then anyone can develop a client. This also has benefits in UX: the latency to update is much lower than cloud based polling, since that's almost always rate limited. The closer anything is to the bottom of the chart here, the better. When buying something as expensive as a heat pump, I wouldn't even consider something that isn't at least local polling: https://www.home-assistant.io/blog/2016/02/12/classifying-the-internet-of-things/ https://www.home-assistant.io/blog/2016/02/12/classifying-th... That being said, I'm not opposed to value add things via cloud services. Want to get the weather via a cloud service, even if that changes the schedule? Totally fine! But ultimate control must be local.