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Forced-air heating systems are so common that when people complain in general about the high cost of heating, they are often—without necessarily knowing it—specifically criticizing forced air. There's more than one reason why forced air tends to bring higher bills, but a primary explanation is that such systems depend on ductwork, and ducts are notoriously leaky. Because it's duct-free, in-floor heating operates at least 25 percent more efficiently. That's a meaningful difference considering that climate control accounts for 50 to 75 percent of the energy used in the average home.
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