Are claims of greater savings untrue?
As in most cases, claims for radiant barriers that sound too good to be true are too good to be true. If your roof accounts for less than 20 percent of your cooling load, then an attic radiant barrier can’t possibly save more than 20 percent on your bills. Claims of greater savings may simply be the results of misunderstanding. For instance, FSEC has measured and reported that radiant barriers can reduce heat gain through R-19 insulated ceilings by over 40 percent. If the ceiling portion of the total cooling load is 20 percent, that’s a reduction of 40 percent of 20 percent, which amounts to 8 percent savings on the total cooling load. If all the facts and figures tend to confuse you, just remember that an attic radiant barrier can save about 8-12 percent on your air-conditioning costs in the Southeast. Any Sunbelt homeowner knows that an 8-12 percent saving on air-conditioning bills can be significant.
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