Home Assistant smart home kit for heating
A compatible Home Assistant starter kit for heating: 1 device, about $280. Every pairing checked against manufacturer docs.
Devices
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Google Nest Learning Thermostat (4th gen) $280
Google Home native. 'Finally adds Apple Home support via Matter' - pair via Settings > Matter QR code; 'you do need to have a Home Hub to use Matter accessories' (Apple TV/HomePod on the Apple side). Alexa/SmartThings/HA via Matter. Caveat: the included room temperature sensors 'don't support Matter or Apple Home' - they stay Google-only.
No hub needed
Every device in this kit talks to Home Assistant directly.
Total
$280