Advices needed about Ansellia africana

[Greenorchid]

Hi guys
I'm waiting for a large plant of Anselli africana to come to my home... and i'm wondering which could be the better place for it, specially in winter....
I have different growing aereas, i could grow it indoor underlights (Envirolite), with winter temperature of 59F min., or in a ''greenhouse'' not heated, where the temperature can go down 'til 32F. Coelogyne cristata, Cymbidium and Sedirea japonica work very well in it, for example. Here plants do receive maximum amount of light, nearly full sun in winter.
So i would like to know which is the min. temperature that an Ansellia could afford.. i've read it can even get a llittle frost.. Which are your experience?

Thank you very much

Claudia