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The foil was placed on the roof underneath the new metal roof a few weeks ago. I can already tell a difference in the house temperature. Although we haven't had a lot of really cold weather since installing it the house does maintain the heat better and we have already had highs in the low-mid 80's, but the warmest it's got in the house as far as I know is 77* and that was late in the afternoon after the sun had been shining on the house all day. I also put it on the ceiling of my garage, have insulated the walls with R-13 and started putting the barrier on the inside walls of it. I was in there today doing some work during the mid afternoon and was amazed how cool it was in there. It's a metal building and was actually cooler than the inside of the house and the house was only at 75*. This gives me even more reason to spend time in the garage instead of in the house with the wife.
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