Homekit compatible heating available in countries.
PiHome with iOS HomeKit - PiHome - Smart Thermostat
Meross Smart Wi-Fi Thermostat MTS200BHK HomeKit - Xiaomi Store
Mysa Smart Thermostat for ACs (review) – Homekit News and Reviews
NETATMO Thermostat NTH01-EN-EU | eBay
Apple HomeKit Smart Home Device Wireless Light, Garage, On Off relay, Switch, Thermostat, Temperature and Humidity, Security, Alarm, Doorbell, Dimmer, Curtain Motor controller, Roller Shutter automation wireless zigbee wifi sonoff tasmota relay
Meross Smart Thermostat for Combi Boilers and Underfloor Water Heating, Glass Touch Panel, Schedule and Multi-room Function, Hubless, Compatible with Apple HomeKit, Amazon Alexa, Google Assistant : Amazon.co.uk: DIY & Tools
Netatmo's Smart Thermostat and new Smart Radiator Valves bring HomeKit heating and cooling to Europe - 9to5Mac
Apple HomeKit partner Honeywell takes on Google's Nest with Lyric smart thermostat | AppleInsider
The HomeKit compatible Aqara Smart Thermostat S3 will soon be available - NotebookCheck.net News
ecobee 3 Lite Smart Thermostat 2.0, No Hub Required - Walmart.com
Meross Smart Roller Shutter, Blind Switch, Compatible with Apple HomeKit – Meross Official Store