To last a couple years but I would highly advise letting it run off the 24V low voltage system so you dont have to change batterys. This digital thermostat is flawless featuring a backlit easy-to-read digital display.
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. Honeywell TH5110D1006U Non-Programmable Thermostat Premier White. Easily switch between the heating and cooling system with just the push of a button. The Honeywell is my top choice when it comes to digital thermostats.
Who cares if your thermostat functions during a power outage the rest of the unit wont run anyways. Easily see your thermostat settings as well as current indoor temperature.
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