6 things you should do before you replace your current thermostat with a smart thermostat – Smart Thermostat Guide
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The 4 Best Smart Thermostats of 2023 | Reviews by Wirecutter
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The Best Smart Thermostats for 2023 | PCMag
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The 4 Best Smart Thermostats of 2023 | Reviews by Wirecutter
Customer (and friend of mine) wanted a smart thermostat to control a waste oil furnace with a gas furnace as a second stage/backup. It's ugly but effective....Also works to isolate line voltage