Studies conducted throughout the country have found that duct leakage contributes 10% to 30% of heating and cooling loads in many homes.
duct leakage can decrease comfort and health and safety.
In typical house, however, about 20 percent of the air that moves through the duct system is lost due to leaks, holes, connected ducts.
The result is utility bills and difficulty keeping the house no matter how the thermostat is set..
Chart shows the impact of return air leaks on HVAC when the return air is drawn from hot attic.
For example, HVAC system having 15% return leakage in hot attic can suffer 50% drop efficiency from SEER to SEER 6..
the return side of the system still requires the full amount of air back.
In home with 15% leaks, the efficiency of the system will drop from SEER 13 to about SEER 8.0, 40% reduction efficiency.
Note that duct leak age of only 5% results efficiency losses of 5% to 15%...
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