how cold is too cold?

[Kailyn]

Hi all
We have been having some crazy northern Ontario weather. I have 2 phals and 2 cymbidiums outside we went from yesterday being 25C to 6C today. I am trying to encourage spikes on these plants so don't want to bring them in prematurely and mess up that process. But I also don't want to damage them or slow them too much (one phal might not be ready to bloom again same with the cyms as I bought them out of bloom this summer at home depot so I have no idea what sort of schedule they are on) So to bring in or not to bring in? is it detrimental to bring them in and out as the weather changes? This is the first year I've put any orchids outside.