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).
Your HVAC system should maintain a comfortable temperature in every room. Reasonable temperature expectations are 68Ë F during the winter and 78Ë F. or 15Ë F. below an outside air temperature of 95Ë F in the summer. You should measure temperature near the center of the room and about five feet above the floor. The temperature you set at the thermostat should be about the same in every room served by the thermostat. A small variance (1 or 2 degrees) is considered acceptable.