Personal finance weblog The Simple Dollar recently found that, on average, having a ceiling fan running in a room makes it feel around four degrees cooler. Australian government studies show that setting your air conditioning temperature 1.8 degrees higher can reduce its running time by 10%. Putting both of these factoids together posits that you can save around 23% of your air conditioning costs by using a ceiling fan and setting your thermostat at 78 instead of 74. More »