Over the years, we've heard many recommendations regarding just how cool our homes should be during the hot and sticky summer months. Just last month, Consumer Reports released some A/C settings recommendations to help cut down energy usage and cost. What's the bottom line? The coolest you should keep your house is 78 degrees when you're home and Florida's Public Service Commission also says to run ceiling fans while the A/C is on. Energy Star says homeowners can save about $180 a year with a properly-set programmable thermostat.However, higher thermostat settings overnight could interfere with getting a good night's sleep.According to The National Sleep Foundation, a room somewhere around 65 degrees makes for the best sleep.