If you live in the Northern/Midwest states (or just about anywhere) and it's 70-75 degrees F outside at night, you can turn off your air conditioner at night. Your apartment/condo will stay cold until morning. I turn my A/C off after 10 PM and it is very cold in here until 10:30 AM.
We don't have a/c due to hubby's health (he couldn't handle the sudden temp changes.) However, I turn off the ceiling fans in the front of the house before I go to bed. It's that principle someone on TF mentioned awhile back: don't heat or cool unoccupied rooms if you can help it. I don't have the know-how to block off heat vents, but turning off the fan is as easy as flipping a switch.
By
06/20/2011
Great idea, except for when we have those hot and sticky, humid Northeastern Ohio nights!