I live in Central WV in the mountains. Yes it is cold here. the unit itself is protected from freezing, but I addded a few things to help. I stuffed the box with insulation around the pipes and added some heat tape to the exposed pipes. No issues, not even on the night it was 42 deg below.
When I spoke with the Riannai rep he said there were hotels and other businesses with the outside commercial units in Canada. I was sceptical also, until I tried it.
Remember that these units were first used in Europe, and they had been in use a long time before they made it to the US.