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 is Temperature drop across air conditioning coil? The temperature drop across the coil is dependent on the relative  humidity of the air, the wet bulb reading of the R/A, and the  ambient temperature of the home. But a goodâ¦ rule of thumb is in  between 17 and 22 degrees Fahrenheit.