[Blackbirdws6]

Temperature setbacks will help you a good deal as mentioned. Purchase a programmable thermostat if you don't have one and program is properly to a lower temp. setpoint when you know you will not be home. Have the heat/cool come back on maybe an hour or so before you should get back home so it's warm/cool when you walk in. Every house is different so the farther you set back your temp, the longer it will take to get back up to temp.

This should help a great deal.

-Brian