Advanced power strips can be set to turn off at an assigned time, during a period of inactivity, through remote switches, or based on the status of one «master» device. (energysage.com)
You could have the power wires with the heating and air conditioning system connected to the remote switch to allow them to come on when the vehicle is started. (yourmechanic.com)
Plug the dryer or vacuum into a remote switch (available from Radio Shack). (petenrichments.com)