At the moment it is only possible to integrate the Tuya thermostats into Homey via the Conbee Stick. This Zigbee Stick recognizes the thermostats and can import them into Homey via the Conbee App (Community Store). Thermostats are planned in the Tuya Zigbee app, but have not yet been implemented.
Integrating thermostats is not as simple as a switch. Please bear in mind that the developer is programming the app in his spare time and does not receive any money for it. So we should not expect miracles.
I don’t blame him especially, but the system how works homey. It handles on people who are doing app/integration for fun on their free time… but on the other hands users paid a lot to have domotic box and it simply doesn’t work with a lot of gears.
I just bought a smoke detector and it doesn’t work with Tuya on Homey, but it works with Tuya on Jeedom. That’s a shame too !!!