Actually, that's not true. You want the air conditioner to pump out 32 degree air (it will be more like 50 degrees), which is then mixed in with the rest of the air inside the house through the circulation by the furnace fan. Air conditioning cycles are more efficient the greater the temperature difference between the coils, so they are designed to maximize this. The thermostat doesn't control based on vent temperature, it controls based on the room temperature. It won't cycle every 30 seconds if the evaporator is very cold, because the thermostat isn't on the evaporator, it's in the living room, which cools more slowly.

You want that evaporator as cold as it will get. What you can do to improve that is to check to see if it's frozen and clean both the evaporator and condenser coils to get maximum airflow through the coils.