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There is no definite answer to this question. I once took my mother to live with me for half a year and faced this question. I thought I would read the reviews of my supplier to understand the whole process. Went to https://nicor-gas.pissedconsumer.com/review.html and did not find any specifics. The only thing I realized that if I used a minimum amount of resources, disconnect the advantage, if the opposite, then unprofitable. In short, left it all as it is, with these utilities only contact.