[ajolly]

Long tail can be flaky, but in practice as long as you buy devices that are local first IE don't need to access the cloud you'll be fine.

(For temp and humidity sensors the Bluetooth Xiaomi sensors are great and they're about $5 each)

[rpcope1]

Honestly, for any sensor that's basically just read only, the best thing I've seen is to just avoid all of the bluetooth/wifi/zigbee/zwave entirely, and just use basic tried and true accurite (or similar) sensors that never need updates and just pull the data with rtl_433. Way, way less fuss, they always just work, batteries last longer, by and large zero bullshit.