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Honeywell YTH9421C1002 Visionpro IAQ With EIM : Any WIFI Compatible Thermostat ?

Honeywell YTH9421C1002 Visionpro IAQ With EIM : Any WIFI Compatible Thermostat ?

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Old 11-07-15, 03:38 PM
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Honeywell YTH9421C1002 Visionpro IAQ With EIM : Any WIFI Compatible Thermostat ?

I have Honeywell YTH9421C1002 Visionpro IAQ thermostat with EIM. I see only 3 wires coming to the thermostat and being used. The EIM is in the attic.
I am interesting in replacing this thermostat with WIFI enabled ones.
I don't think I have an option to run extra wires to the thermostat.

Can anyone suggest which WIFI thermostat can I replace my existing one with?
I am assuming I will have to change EIM unit also?

I read all the forums and everyone talks about wiring, I only see 3 wire going to my thermostat.
Any suggestions on wifi thermostat that I can use with this EIM or replace will be appreciated
Thanks in Advance.
 
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Old 11-07-15, 06:59 PM
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The Honeywell Prestige IAQ would be almost an exact replacement.

It only requires 2 wires between the stat and the EIM.

A separate internet gateway that plugs into the router gives you wifi capability.
(Technically it uses the Redlink protocol not wifi but it is the same difference)
 
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