thermostats

I've been looking on eBay and other places to replace both of my RC-2000WH thermostats. One no longer accepts remote setpoint changes and the other seems to have stuck relays (AC stays on). They lasted about 9 years. Does anyone know of a place selling them for less than a fortune or have one...

I have 3 heat pumps each controlled by a basic Nest Tstat. The Nest allows very basic stuff but is missing some features my old Tstats had (such as vacation mode) and manual over-ride use (manual hold and resume) is clunky. I would like to update to something with advanced features and easier...

Has anyone tried using Zigbee 3.0 devices with the HAI Zim? I've been reading that they should be backwards compatible and support the HA profile. I want to try a few devices but hate buying them if they won't work. I'm looking at things like the Smartthings remote button, water sensor...

I have an omnistat2 that supports zigbee.  I think it is like a repeater as I am hard wired to the omnistat2.     Can the Omnistat2 communicate to a Kwikset zigbee?     Else, what do I need to connect to Kwikset?   Michael

Dont know if this has been covered already, but it looks like Carrier has an automation controller for their INfinty line. I emailed Carrier and told them I was interested in using my M1 to control the HVAC. They sent me an email back and said I need to use Carrier part # SYSTXCCSAMCAT501. They...