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Not necessarily. I have 3 sensors through my house, but the common factor is the system itself. In the summer, the upstairs is too hot, in the winter the upstairs is still too cold.
The sensors do help balance it out, but the limitation is that the system is routed poorly and the upstairs has bad circulation.
In this case, my husband and I get a window AC during the summer, and a space heater during the winter.
If your landlord is concerned about fire, get a ceramic heater that does not actually have any live wires. Something like this: https://smile.amazon.com/Lasko-5790-Oscillating-Ceramic-Control/dp/B008UO7I1W/
I also connect it to a thermostat like this: https://smile.amazon.com/Lux-Heating-Cooling-Programmable-Thermostat/dp/B000E7NYY8
My husband is notorious for leaving a room without remembering to turn off the space heater, so it’s nice to have both a temperature sensor that prevents it from getting too hot or too cold and also timer so that it’s not running when I know we aren’t going to be in our bedroom anyway.
You can use the thermostat to set your schedule, just as you would with the ecobee or another “smart” thermostat. Plug your AC or heater into it, make sure to turn the device up to HIGH so it doesn’t inadvertently shut off with the integrated thermostat before the plug turns it off. And you will have your own climate control 🙂