When a child is away at college, they are considered still to be living at home. This means, that you are still maintaining their home so that is part of their support even when they are not there so you do not remove days that they are temporarily away at school. If they are not coming back home and that place does not need to be there, then you would not include it in their support, but if they keep all their stuff they don't take to college with them and come back home, then although it is in a sense double dipping, it is accurate.
Think of it the same as if you are traveling and paying for a hotel room, you can't stop paying your mortgage while you are in the hotels so the mortgage and home expenses do not go away or change due to you being temporarily away from home.
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