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).
There are ways to keep cool without turning on your air conditioner, but when the summer temperatures start busting the 90 (or 100!) degree mark daily, or the humidity makes it feel like you're swimming through a bowl of soup, sometimes air conditioning is a must. Stay cool and save money with these energy saving tips: 1. Keep the AC Lower at Night: During the night you don't require the same level of conscious cool. Try turning your AC down (so it is running less) during your sleep hours or, if your unit has one, utilize the sleep mode which lowers the output on a timer.