Alexa supports thermostats with one or two setpoints. Single-setpoint thermostats A single-setpoint thermostat has a single temperature setting that it attempts to maintain. For example, a thermostat with a single setpoint might turn on a furnace when the temperature falls below the setpoint, and turn the furnace off when the temperature rises …
https://developer.amazon.com/en-US/docs/alexa/device-apis/alexa-thermostatcontroller.html

