Brand-new Comfort-Aire 80% furnace with Pro digital thermostat. Set thermostat at 69 degrees. Furnace goes on, temp goes to 69. Furnace shuts off. Then it gets cold but thermostat shows 68. Then it comes back on. I shouldn't feel cold if it only dropped 1 degree.

Help!

Check the settings in the setup procedure.
Sometimes it's the default setting for another type of system
And not for your type of system. Let us know how it goes Thanks