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I think they'll do fine, although my answer is not based on personal experience. Serama might have been a problem, but you don't have any

Just to clarify, do you mean -1 degrees Fahrenheit, or Celsius? If it's the latter, they should have no problems, and will not need a heater. If it is the former, I can not give any advice, as it does not get this cold here. What breed are they?