Does opening the door to the attic have a affect on the AC efficiency in the house? In the hot weather, I keep my 2 garage doors open and the back rear door to get air flow to keep the garage cool in the Arkansas summers. I also have a screen door to the attic which has steps to walk up (unfinished and insulated) and is located in the garage. I use this to ventilate what little air that will get up the steps to the attic which has several attic spinners. In listening to your show I hear you tell people not to create a void in the attic and that house AC will be drawn to it? I am in an all electric house and actually my electric bill has been very reasonable. I use a setback thermostat and cool the house mainly early evening till midnight.