Achieving day/night temperature differential indoors

[mremensnyder]

My question is fairly straightforward. I am reading about Paphiopedilum culture and this seems like it will be the most difficult parameter to get right.

Living in SE PA, the warmest 5 months of the year should present generally favorable conditions for keeping many mottled leaf Paph species healthy, so I plan on growing my Paphs on my porch, sitting in a large fishbowl to augment the humidity, while still allowing for some air movement. Of course, when heatwaves occur or days below 65F or so, I can simply bring the plants indoors. But, all in all, the warm days and cool nights should allow species like P. delenatii and P. bellatulum to do well.

From October-April I will have to grow in a viable indoor setup. Ambient indoor temperatures should be between 65-72F but this will not allow for much diurnal temperature variation or for cool (even chilly in some cases, like for P. armeniacum) nights. How do you all maintain such a temperature differential in your indoor growing setups, especially to simulate habitat temperatures in the cooler months? Getting an indoor growing growing tank down to, say, 50F at night seems like a challenge. Do any of you use refrigeration, cold packs, open windows or any other special techniques to keep your Paphs in favorable temperatures?

I might even close off the heat in one room and allow it to stay in the 40s and 50s at night.