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Rewiring Nest 3 to Lennox EL296UHV

Community Member

I'm looking to add an AC unit to my hvac system. I've learned, as I receive bids, that when the previous owners installed the 2 stage furnace (title) no one bothered to replace the 2 strand thermostat wire so my nest hasn't been properly controlling things. 

Long story short, I need to know what I need to replace my thermostat wire with. How many strands? What inputs will I be using? I want to go be future proof so I can safely add anything up to a 2 stage heat pump.


Can the best properly control this setup?  Do I just need to use a different thermostat?