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If you are asking which one you leave on to keep the pipes from freezing in the winter time the answer is that it depends. First, most houses today don't have this problem. The supply lines in the yard are buried deep enough not to freeze and the houses are insulated well enough for interior pipes not to freeze if the house is occupied.

If you own an older home then you may have to worry about this. If you are worried about the supply pipe in the yard that brings water to the house not being buried deep enough so that it could freeze, then you only need to leave open a cold water tap to drip.

If you have pipes in your walls or under your house that you think might freeze then you need to let both hot and cold drip.

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