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Even though the compressor has stopped, the coils in the attic are still cold, so the system will run the fan for an extra few minutes to take advantage of the free cooling. This is part of the newer energy saving systems. One of the cheapest upgrades to an old air conditioning system is to install a smart thermostat. The new thermostats take advantage of that very type of set up. It will continue running your fan, even though the compressor has stopped to continuously give you cold air for another 5 minutes or so.