If he has listed as "Cool" or "Cool/Intermediate" it should be fine. If the greenhouse gets down to 45 deg F/7 deg C at night it really shouldn't be a problem - especially if it warms up a bit during the day. I think also that if it hasn't already, it will soon be thinking of losing leaves. When it does that, you can cut back the water considerably. (I wouldn't go bone dry, but let it dry out between waterings, water in the morning so that it isn't soggy by evening) A dry orchid can tolerate a lot more cold than a wet one. But this one should have no problem in Cymbidium-range temperatures.
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