Roberta is spot on with acclimating; I too follow this practice, for me though it means plants procured in winter & early spring spend a couple months/weeks under lights before transitioning to the greenhouse. Once they've been thorough a summer & autumn in the greenhouse, they're usually set to remain, though there are exceptions [some of the anceps hybrids with Brassavola in their background for example]
Something else to consider, which I have not done in my greenhouse here [but did do when in my greenhouse in the midwest when I lived there], is to tent a bench and use a reptile heating mat in conjunction with humidity trays to create a warmer micro-zone in an alpine house. I did this in that space to maintain a small collection of mini-catts that needed night temps to be 10-15degrees warmer and it worked very well. The heater was on a temperature-controlled plug, which was used in conjunction with a timer--I charted the min-max temps in the greenhouse and then used that data to set the timer--it was a prop tent hack that worked very well [and relatively inexpensively] to add a warm zone to a cold greenhouse.
---------- Post added at 10:30 AM ---------- Previous post was at 10:18 AM ----------
I don't grow many Catts, but Laelia-wise, autumnalis, superbiens, gouldiana, furfuracea & hybrids of any of these are all candidates too [you could probably add albida & speciosa to this list as well--most of the 'Mexican' Laeliae are very temp tolerant, aurea & rubescens perhaps being somewhat the outliers]
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