Our original 1990’s Honeywell Thermostat is circling the drain. Looking to replace with a new smart thermostat. Here is what it looks like with the cover off. Doable for a mid DIY guy like me or not?
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What makes you think that thermostat is going to fail? It’s about as simple a device as you can imagine and doesn’t really have any parts that wear out.
Do you really need a smart thermostat, or just something programmable? A programmable thermostat works for most people, unless you have schedules that vary wildly week to week you probably won’t see much if any benefit from a “smart” stat.
If you have the C wire that others have mentioned and you liked your Honeywell… I have had a couple of the TH9320WF5003 for about 10 years and they are great. I had one of the Lyric T5s as well, but like the 9320 so much better. Nice screen, nice app and integrates well into Home Assistant.
Doable, make a note of where the wires connect, unscrew them and unscrew it off the wall. Hopefully you have a little slack for something new.
You need to understand what voltage if any is coming from the wall. That will impact your replacement choices. Smart wall stats generally expect power.
I put a Moes Zigbee stat on last year which is connected to three wires (live neutral switched).
Toss it and get an ECHOBEE
Even if you don’t have a C wire, you can use an external power brick to power the smart thermostat in place of a C wire. Otherwise at least the Honeywell thermostats come with a C-wire adapter than can be wired into your furnace control box and shifts some of the wires around to provide a C wire. I found the external power brick to be a little less daunting, but either option should work for you.