Welcome. Hubitat is compatible with several z-wave and zigbee thermostats. The official list of compatible devices is in the hub documentation pages here:
https://docs.hubitat.com/index.php?title=List_of_Compatible_Devices
And there’s a community wiki thread that discusses other devices that users have gotten to work with their hubs here:
Just keep in mind if you go with z-wave, you’ll need a thermostat with the EU z-wave frequency.
I’m not familiar with Somfy’s Tahoma box, but if you have somfy shades that use their RTS protocol, somfy also makes a bridge device called the ZRTSI. This allows RTS shades to be integrated with z-wave systems, and there’s a community-developed driver that makes the bridge compatible with hubitat.
Just like with z-wave thermostats though, you’d want to make sure somfy has a EU z-wave version of the RTS device.
There’s always plenty of people here in the community that are happy to help, so feel free to ask further questions as you investigate your options!