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Discussion Starter · #1 ·
Want to replace three Honeywell THX9421R5021WW 2-wire thermostats with Z-wave, wifi or whatever compatible ones, or add wifi z-wave, whatever to the existing ones.

Don't want to have to re-wire them back to the A/C units as a result, just replace the boxes on the wall with ones I can program and monitor remotely.

I'm rolling out Z-wave light switches etc. throughout the home, and the 'stats ideally need to be Z-wave or wifi compatible, ideally working with the Samsung Smartthings hub and app I have already installed.

I think the existing thermostats are wired up to a Honeywell THM5421R02 unit in the attic.

Any suggestions?

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