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Can use an IAQ or Edge thermostat if there are only 4 conductors to the existing thermostat.

Any new Modulating furnace will have the provisions for a 2 stage A/c or heat pump. Although the mod furnaces with a PSC or ECM(X13) blower aren't quite as good as a VS ECM blower.

Plus, Tindra is asking before hand, so good chance many of the pit falls can be avoided.
 
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