2 Thermostats - 1 guaranteed works (20722 - near Peace Cross)

The Honeywell is programmable (but not smart [enough to connect to Internet]). Works.

The Ecobee is programmable and smart, but I can't get it to work again after I removed it from one home (where it worked) to use in another (where it wouldn't power up).

Idea: Take both. Try the Ecobee to see if you can get it to work. If it doesn't, use the Honeywell (at least it works and I have the manual for it).