I got my Zygopetalum mackayi from Santa Barbara Orchid Estate and they grow them alongside their Cymbidium.
A lot of the Oncidium and related hybrids are pretty tolerant of cool temperatures too. The Orchid Estate grows Beallara Marfitch out with their Cymbidium and the similar NOIDs that I've picked up at grocery stores are doing well outside for me with my Cymbidium too.
If you go to their website:
Santa Barbara Orchid Estate Home Page anything that they have listed as temperature tolerant survived a record low of 27 degrees Fahrenheit in their unheated greenhouse.