the Google Nest Thermostat is one of the few thermostats that support Matter (formerly known as Project CHIP or Connected Home over IP). Matter is a new smart home connectivity standard developed by the Connectivity Standards Alliance (CSA) that aims to enhance interoperability and compatibility among various smart home devices.
However, it's worth noting that, there may have been updates and releases of new smart thermostats that support Matter. The adoption of Matter by manufacturers and the availability of compatible devices may have expanded. I recommend checking with the latest information from the manufacturers or official sources to determine the current selection of thermostats that support Matter.