You could replace all or only some of your thermostats with Mysa. For Mysa to control specific rooms, you would need to replace every thermostat that controls the heating for that room. Although one Mysa can control multiple heaters in the same room, please ensure that the combined wattage of the heaters is no more than 3800W.
If you want to install Mysa in only the rooms that matter most to you, Mysa will help you automate your heating and ensure you are comfortable in those rooms. However, we recommend replacing every thermostat in your home with Mysa to maximize your energy savings.
Please reach out to our team if you have any further questions!