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Nest thermostat to a Lennox Furnace

Community Member

Hello all, 

looking for a wiring picture from the furnace wiring board of anyone who successfully installed a Nest thermostat to a Lennox furnace EL296UHV. I’ve read a lot of post saying it can be done and I also agree it can be done I would like some photographs of the wiring to confirm that I’m doing it correctly and won’t hurt my system 


Platinum Product Expert
Platinum Product Expert

Lennox uses a proprietary interface called iComfort that is incompatible with any of the Nest Thermostats.

Luckily they also have a 24Vac interface on the control board in the furnace/air handler.

First, you need to figure out which interface your system is using, and then you need to figure out which of the terminals on the control board need to be connected.

I would recommend that you bring in an HVAC tech to do this.

To ensure that I see your reply, please tag me using @Patrick_Caezza

Hi there,


Thanks for reaching out. Were you able to check your system interface as Patrick_Caezza mentioned? Also, you can visit this support article for more information about the Nest Thermostat Compatibility. 


I appreciate your help, @Patrick_Caezza.




Community Specialist
Community Specialist

Hey everyone,

@DRc2, I'm dropping by to ensure that everything is covered here. How's it going with your Nest Thermostat? We would appreciate it if you could share the information we're asking above. Also, were you able to perform the steps suggested above? We'd be glad to hear from you.

I appreciate the help, Jenelyn and Patrick_Caezza.

Community Specialist
Community Specialist

Hello there,


We haven't heard from you in a while so we'll be locking this thread if there is no update within 24 hours. If you need assistance or want to discuss topics, feel free to start a new thread.