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).
What temperature do I set it? The range is 70 to 120 on the dial. Im thinking to set it at 95 or higher, cause when its 90 outside, it will sure be 120 in the attic all day. Cool air enters the eaves (soffits) on a hip roof. There are 2 tiny 8 roof vents. No other heat exit points. Composite roof shingles, ya know, asphalt like.