title_body: What is the range of ambient temperature I can keep my espresso machine at?
upvoted_answer: Any coffe machine is quite broad. I suggest considering the materials involved. Since portafilter machines are meant to operate on higher than ambient temperatures for a very long time, lower temps aren't usually a problem in terms of degradation.
  I can't remember any materials involved in a portafilter machine that would degrade faster (or et damaged) in lower temperatures rather than operating temperatures.
  Dependig on the age, there might be hemp sealings in the machine that could potentially dry out.