Hi Sue,
This house primarily houses tender, mostly South African, bulbs (which includes a fair number of the tuberous Pelargonium so I'm not cringing at all!). The bubble wrap was only there whilst Susan worked out a way of hanging it in preparation for the winter. It will be folded away under the benches except in very cold weather.
As it is in a sunny spot it has roller blinds the full length of the south side, roof and sides. The only time they have been used since it went up in June was one day in July when the outside temp exceeded 30C - I was worried about the cacti at the far end scorching. I can see them mostly being used in warm spells in spring, to discourage bulbs from going dormant too early.
I don't think fans are needed for us as we don't grow cushion plants etc in here.
The guys that built it were convinced the automatic roof vents would never open as the big door and extra louvres would keep the temperature too low - they were wrong! That said - the temperature is lower than the old Alton used to get, as it had no extra vents, and a narrow door.
