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Can you give me model on old stat. Some of the old Honeywells used X as emergency heat and some used it as common.Also provide model on your outdoor unit
Model on outdoor will tell me right off if this is a het pump if you can give me that
One more quick question on stat,did it have an E terminal?
OK I found it,The answer to your question is YES the X was Common so it will go to C on the Nest!
By dual heat do you mean gas backup?
The answer is no if you have electric backup strips.