The answer to 'ductwork high energy bills' is that leaky or poorly insulated ductwork is a common cause of high energy bills. Ductwork that is not properly sealed or insulated can allow conditioned air to escape, forcing your HVAC system to work harder and use more energy to maintain the desired temperature in your home.
Some common symptoms of ductwork issues include uneven heating/cooling, high utility bills, and drafts or hot/cold spots in the home. Solutions can include sealing ductwork joints and seams with mastic or metal tape, insulating exposed ducts, and fixing any leaks or damage. However, more extensive ductwork repairs are best left to professional HVAC technicians, as they have the right tools and expertise to properly assess and fix the problem.