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1 A proper home air duct cleaning costs anywhere from $400-$1,000, depending on the size of the system to be cleaned, the type of services offered, the regional climate and the level of use the ventilation system gets, the type of materials inside the ductwork and the amount of contaminants (dust, mold, etc.).
1 Leaky ducts can also cost homeowners about 10 percent to 30 percent in efficiency. 2  This will make a 96 AFUE high-efficiency furnace run at 66 percent to 86 percent and make an economical 80 AFUE not much better than an open fireplace. 3  The cost to replace ductwork is about $8 to $12 per linear foot of ducting.