Just to combine a couple of thoughts in this thread; what I would do is roll down all the way two of the windows for either the last block of your drive, or after you park leave them down for a few minutes. Then roll them back up.
If it's just random moisture in your car it should be removed by cooling the air and getting the moist air out. However if it is the heater core, the moisture escaping from that would still ice up the windows even with changinf the air in the car.
And if you are lucky there may just be a small leak in the core. I say lucky because it's easier to replace a heater core than to also have to clean up coolant from all over under the dashboard.
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