I achieve the same results with a whole-house fan run at night, foil-bubble-foil, spray foam insulation and insulated white-backed window curtains. The summer procedure is to power up the fan and open the windows at sundown, then reverse the procedure at sunup. When the paulownia trees reached 40 ft. in 3 years, we only run the AC a couple of hours in the afternoon to maintain a 76 degree environment. This is in North Carolina at about 900 feet elevation. It's a 3 story 2700 square foot house with Hardieboard (thin concrete) siding. You might call BS, but my electric co. and propane co. are very disappointed.