Cheap and easy, if you have an electric hot water heater install a timer. Turns off the heater over night and when you're at work. They cost about $40, pay for themselves quickly.
Plumb gray water from your washing machine, bath tub to a french drain to keep you trees happy. A/c drains can put out 5 gallons a day, pipe it somewhere!
Kitchen foil can be used as a radiant barrier if you're willing to spend the time installing it. Use the heavy duty stuff, 125 sqft for about $7 a roll.
Caulk, window glazing, weather stripping, spray foam, and insulation are all cheap and can do wonders if you know where you need it.
Turn off ceiling fans and lights when you leave the room! I constantly find running fans in unoccupied homes. Fans only cool when you are under them, otherwise you're just wasting energy.
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