There are only 2 smart thermostats: ecobee and nest. Looks like you bought an older house so the wiring could be an issue.
Why would you worry about the wifi signal going out? You buy a nest or ecobee to run themselves, you don’t touch them unless you want the windows open. Who cares if you can’t see the thermostat for hours or days. Keep your hands off of the controls. I’ve owned ecobee thermostats in my last 3 houses and I prefer ecobee over the others.
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