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I had a house with a lighter color, white and gray mix. It was time to replace the shingles and rather than do that I bought bright white metal sheets. I installed them to 1 X 4's spaced 2 feet apart with the boards running horizontally. The year before I was using 12,000 and an 8,000 btu AC units downstairs and a 8,000 upstairs. I now use an 8,000 downstairs and a 4,800 upstairs and if you set them on high and leave for a while and then come back a few hours later, like my wife did, you can end up seeing your breath while it is 95 degrees outside. Heating bill went down about 20% during the winter too. We have no access to the attic because the way the roof is built so the radiant reflectors wouldn't work, thought doing that a couple of years prior but couldn't find anyone willing to even try to install. The metal roof ended up costing about $3500 less than new shingles. With the one inch separation between the roof and the metal makes even the thunderstorms much quieter too.
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