I understand the smart thermostats now have extensions so you can tell them to take the temperature from somewhere else. You could place an extension in the sun and tell it to use that for its decision making.
Of course, those aren’t exactly cheap. But around here we get regular sales sponsored by the utility to make them affordable.
These places are old and have baseboard heating. I think I’d be better off to hook up the space heater again.
Now, I need to go warm up in the bathroom and take a shower. I think I’ve finally figured out the secret to stopping the water pipes from screaming at me.
Later...