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This depends on accessories or add ons.
What wires/terminals are utilized on the current thermostat?
was the previous thermostat a Icomfort with number terminals instead of letters?
Ok your furnace came as a package to operate at the highest efficiency possible.
Before we proceed, are you aware the changing to the Nest will lower your efficiency?
Because the I Comfort is a communicating system that talks back and forth to a 1/10th of a degree.
It automatically adjust run times, blower speeds and uses an algorithm to make the furnace run as efficient as possible.
Basically this I Comfort is a package to talk continously as to what is going on, how fast the unit is heating/cooling and when it should shift gears.
The Nest is a simple on/off thermostat. It can run schedules and run times but does not "converse" with the system as the I Comfort.
I do not talk folks out of this change..I just warn you in case increased efficiency was your goal.