Most digital thermostats have batteries to keep the screen active during a power outage. But why? If the power is out, your furnace will not operate even if you can read and change the settings in your thermostat.
When you have a power failure, modern digital thermostats have the ability to remember settings, including your daily schedules. So I always thought, why do we need batteries at all when the thermostat is powered by the furnace and the circuit board remembers the settings?
If you’d like to stop buying thermostat batteries, then rest easy if you already own or want to buy the Honeywell Wi-Fi touchscreen TH8321WF1001, because it requires no batteries. Now you don’t have to worry about what happens if the thermostat batteries die.

On top of that you no longer need to worry about batteries leaking and corroding the contacts inside the thermostat. For that reason alone it would be a good idea to buy a Honeywell Wi-Fi thermostat.
But, some of this still just didn’t make sense to me so I had to call Honeywell. Tech support said that those thermostats that have batteries will hold the memory for only a few hours after a power outage, but with batteries, thermostats will hold previous setting much longer.
The Honeywell tech didn’t sound convincing enough so I called again and got a another tech and got a different answer and that got me so frustrated that I can’t even remember what he said.
If you want to call Honeywell Tech Support you can reach them at 800-468-1502. They have a line for home owners and professional HVAC technicians.
Where To Buy The Honeywell Vision Pro 8000 TH8321WF1001 Thermostat
We have over 200 of these Vision Pro 8000 Wi-Fi thermostats in the system I’m currently working on. They operate pretty much flawlessly. One of the only problems we’ve encountered is about 3 of the subbases have been shorted out.

Warranty has never been a issue. You just need to contact the supplier you buy them from to handle the warranty. Most of our are bought in bulk through Amazon. You can do the same here. Make sure you see the WF for Wi-Fi in the middle of the model number.