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Creating heat for the emissions system and heat to keep you warm is fastest and most efficient if you simply drive gently immediately after starting the Prius in the winter. Allowing the engine to run while the Prius is parked takes longer and is less efficient. "Just Drive It!" Once the heater warms up, resist the temptation to turn up the fan-speed on too high. That will actually decrease the potential heat. Air blasting over the fins of the core too quickly prevents the opportunity to absorb as much heat as possible. Slower air doesn’t. In other words, don't exceed the medium speed setting