Thanks Shane! Indeed I have south-facing windows too, but I have two north-facing windows in mind for Orchids. Having said that the health of the plants is more important so I will move them to the south-facing part of the house for the summer at least. The house has heat recovery ventilation so temperatures vary less, I wrongly assumed this would be good for Orchids! I will look more at the Paphiopedilums and Phalaenopsis, I focused on New World orchids as that is where I grew up. Thanks for the advice and looking forward to future society meetings.