If you don't already have a smart thermostat, check out the Ecobee . You can add multiple smart sensors so you can add 1 per room. I'm not positive but I'm pretty sure you can see the temperature in each room since it allows you to set a temperature for each sensor. . It is fully Alexa compatible. Their support is pretty good so if you drop them an email, that can confirm if this meets your needs. But at the same time, if you just go from room to room with a good instant read thermometer or an inexpensive thermal leak detector as mentioned above, you should be able to find the problem without needing an elaborate and expensive solution.