Vent insulation is another great way to save money on energy bills. On hot summer days, uninsulated ducts can cause comfort and energy problems. The air that has been cooled by your central air conditioning system ends up being heated by the ductwork. You won't feel the relief of cooler air until your HVAC system has cooled off the hot ducts. With proper vent insulation, it will take less energy and less money to keep your house cooler!