Just like you, orchids do not like stagnant air. Just imagine how you feel when it is hot and there is not even a breeze blowing. In their natural habitat, many orchids grow high in trees or way up on mountains where the breezes are always blowing. Wind cools the leaves when it is hot, and helps dry excess moisture that may have accumulated on the plant. Wind also helps distribute warm and cold air preventing harmful hot or cold air pockets.
Fresh air is as important as watering.
In stagnant and damp areas, flowers can develop brown spots which is a blight called Botrytis. It spreads very fast and will infect all blooms in the area. Just another reason to keep the air moving around your orchids. Ventilation is a big help in keeping the temperatures comfortable and more even but be careful of drafts, because they too can be harmful. Swamp-cooler type air conditioners are excellent in hot dry climates like the American West, because they provide air movement, reduce high temperatures, and also help put humidity in the air.