Apple Home (HomeKit + Matter) smart home kit for heating
A compatible Apple Home (HomeKit + Matter) starter kit for heating: 1 device, about $260. Every pairing checked against manufacturer docs.
Devices
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ecobee Smart Thermostat Premium $260
'Works with Apple HomeKit', 'Alexa Built-in', Google Assistant voice, SmartThings listed (ecobee). Dual-band WiFi + BT 5.0 + 915 MHz for its room sensors. Matter not advertised. Home Assistant: HomeKit-controller path exists, not verified here.
No hub needed
Every device in this kit talks to Apple Home (HomeKit + Matter) directly.
Total
$260