It's very simple...a very thin cloth fixed to the balcony guardrail (is it called like this in english?).
It's a south balcony that in summer, with all the outside temps and light reflection from the wall reaches really high temps (over 40ºC). This will be compensated by night temps that are, in average, around 15ºC.
In the photo there's a Laelia milleri and a vasconselosiana, as well as my anceps.
The anceps spent the last summer with this setup and it bloomed like crazy (four spikes). The other two, have been inside: the vasconcelosiana is new to me (bought it 2 months ago) and the milleri got it last september but it never bloomed, in spite it has been inside under almost full sun all winter (winters here are very sunny in the coldest months). I believe that the plant is confused because I got it from a brasilian vendor at a show and it was growing a new shoot (their growing season in spring).
I need to improve the setup, which means I need to put some more stones over the plastic container because of the wind (that can be really strong by the end of the afternoon).
Enough talking...photos bellow