Terrarium on balcony?

[fluffylily]

I am building a 60x45x60 cm Exo-terra this weekend and was going to put the terrarium in the office room until I thought about how I will drop the temperatures at night during winter season. I live in Switzerland so I am fortunate to have very pleasant weather in summer and very cold weather in winter. I was going to open a window in the winter and hope that the lights not being on would lower the temps in the terrarium enough to induce flowering, but I think it is a bad idea to spend so much energy to heat up our room again. My husband suggested putting it on the balcony, and I thought about the positives and negatives of putting this on the balcony.

Positives:
It will get extra light from the sun (west facing balcony) in addition to top lights. Or I can just not have lights on the top. The pump is loud and will be outside where it will not bother us. It will easily have day-night temp differences.

Negatives:
Will be outside and I will have to brave the cold when I want to enjoy my orchids during winter. It might have too much light during sunset (currently, my phals are getting sun-burned out there so I need to pull some shades down everyday). It might heat up too much and I need to get more fans (currently have two). Need to get a heater for winter time.

Any suggestions? Thanks!