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David Letterman kept the Ed Sullivan Theater around 55 degrees F because the temperature keeps the audience alert.

Apparently back in the 80s, Dave experimented with different temperatures on different shows. He tried 75 one day. 65 another day. The day he went with 55, jokes really hit and from then on that was the temperature. http://www.sandpapersuit.com/2011/07/why-letterman-keeps-his-studio-so-cool.html

Some folks say David Letterman doesn’t want to break into a sweat during intense interviews under hot studio lights. But, according to George Clarke, Theater and Building Engineer for CBS, the cool air makes the sound crisper and keeps the audience more alert. “Crowd reaction is very important in this business, and the comedy stays fresh in the cold, too” says Clarke...

At about 5 o’clock each week night, Clarke and his boss, Joe Soldano, Building Manager, must make sure that the temperature of the Ed Sullivan Theater is pulled down to 50° F before the audience arrives. The MULTISTACK chiller has never failed to cool things down. “The stagehands call this place ‘the refrigerator’.” In the filming rooms everyone sits around in winter coats, hats and gloves. They, too, are kept crisp and alert by the cool temperature. via http://www.multistack.com/casestudies/david_letterman.aspx

Instead of dumping the humidity outdoors, why not have an option to condense it to a water holding tank, thus offsetting the need to purchase water? This sounds like it might even be able to distill water, which would further save money for those who need distilled water for apnea devices and other uses.

Derek Thompson. (2021, August 25). Adult hospitalizations since July 1 vs. Vaccinations, by state: 1) The relationship between more vaccines and less hospitalization is pretty straightforward. 2) Holy moly, Florida. Among states with more than one shot per person, FL really is on its own island of pain. Https://t.co/tuTAdUT0OM [Tweet]. @DKThomp. https://twitter.com/DKThomp/status/1430643278337163267

Can Air Conditioners Spread COVID-19? (n.d.). NPR.Org. Retrieved August 22, 2020, from https://www.npr.org/sections/goatsandsoda/2020/08/15/897147164/can-air-conditioners-spread-covid-19

Does air conditioning spread the coronavirus? (n.d.). NBC News. Retrieved July 5, 2020, from https://www.nbcnews.com/health/health-news/does-air-conditioning-spread-coronavirus-n1232175