I really like how easy it is to create a thermostat with home assistant!
I wanted to have a way to pre heat the bathroom for giving the baby a bath. The cheap 15€ space heater heats the room but the buildin thermostat was crappy. As I already had an air sensor in my bathroom, I just added a remote controlled wall socket plug I had laying around to the space heater. In home assistant you then can add a generic thermostat by selecting the sensor and the actor (wall plug).
