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Answered 2009-09-29 20:07:03

The recirculate button closes the vents from the outside using only the inside air that is already inside. In cold weather, constantly introducing cold air into the vehicle may offset that slightly or more. It doesn't take much to keep already warm air to temperature. On the flip side, you would always use the recirculate when your air conditioning is on or the air will warm up from warmer air outside the vehicle.

if you do that in cold weather your windows will fog up and freeze so do it only for a few minutes

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