Buy an air leak detector: (Here\'s one for $24: https://goo.gl/Xy64ZI)
Check the attic
Check insulation R-value or thickness
Change air conditioner filters
Check ductwork for dirt streaks
Insulate ducts and pipes that travel through unheated areas
Replace bulbs with CFL bulbs
Instal or properly set dimmers
Find ways to use more natural light
If possible upgrade to new energy efficient equipment
Unplug electronics while not in use
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