It's a Matter of Degrees!
In warm weather, the thermostat at home should be set at 78 degrees.
(Don't do this, of course, if it will cause health problems for anyone
in your family.) When no one is home, set the thermostat at 85 degrees.
That way, you'll reduce the need for air conditioning and you will save
energy. If you have ceiling fans or other fans, turn them on. The
blowing air can make you feel 5 degrees cooler, without running the
family's air conditioner. Fans use a lot less electricity than air
conditioners!
In cold weather, wear warm clothing and have your thermostat set to
68 degrees or lower during the day and evening, health permitting. When
you go to sleep at night, set the thermostat back to either 55 degrees,
or turn it off. When you leave home for an extended time, set the
thermostat at 55 degrees or turn it off, too. That way, your family can
save from 5 percent to 20 percent on your heating costs. (Don't do
this, of course, if it will cause health problems for anyone in your
family.)