We purchased a home with a radiant barrier already installed in the attic. The first time I went into the attic during the summer, I thought I had an AC leak and I was cooling the attic. Turned off the AC for a few hours and returned to the attic. It was just as cool. Having the attic cooler (by approximately 15 deg F), places a much lower heat load on the ceiling. I cannot quantify the savings, but when I compare my electric bill in the summer with neighbors with the same floor plan, my bill is consistently lower. Of course, thermostat settings are a big player. We leave our thermostat at 76 deg F year around. Not necessary the most efficient setting, but comfort for us is more important.
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