Another thing to remember is the humidity levels. During this period, dendrobiums do not need a lot of moisture. Very little water will be enough to keep their roots alive. Also keep in mind that their roots constantly need plenty of air circulation so you should place them where there is a lot of fresh air.
Remember, that is based on energy usage, not comfort-levels, which are the purpose of having an air conditioner, in my not-so-humble opinion. Fact: At night, the ideal temperature comfort range for Americans drops to 65 to 72 degrees Fahrenheit (or about 87 degrees if you are my wife).
During the hot summer months, raising an air conditioner's temperature 6Â°F can save 10 percent on cooling costs.[1] In fact, for every degree the temperature is raised above 72 degrees, cooling costs drop by 3 percent[2] and carbon dioxide emissions decrease by 121 pounds.[3]