The main concerns with growing orchids in an enclosure are good ventilation, temperature control and light.
The smaller the greenhouse the harder it is to control these elements and keep them consistent. It's real easy to have a change in the weather and end up cooking or freezing them.
You'll need fan(s), heater, controls etc.
It's why most people who start with greenhouses keep going bigger and bigger.
You could probably grow yours on some open shelves on the patio during the summer and move them indoors for the cold months.
Maureen
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