When my spouse and I bought a new home, we had a clogged furnace with dust, dirt, debris and grime. It was really bad. The debris blocks airflow, forcing the furnace to work harder and run endlessly to reach top settings. This uses more energy, raises utility bills, and impacts comfort. There’s also the fear of the furnace overheating and potential threat from carbon monoxide. Even at peak capacity, I doubted the furnace would be actually energy efficient. I hired a licensed Heating plus Air Conditioning business to inspect the furnace, including the ductwork system, and supply a recommendation. Fortunately, the air duct was in fantastic enough condition to keep. All of us were able to get by with having the ducts professionally cleaned and sealed. This process was fairly involved and expensive, however was handled suddenly and with no mangle to the home. Unfortunately, the furnace was beyond saving. The business discovered a minor crack in the heat exchanger. Since the heat exchanger prevents the introduction of combustion byproducts, such as carbon monoxide, it’s harshly substantial. The cost of a new heat exchanger is more than a whole new furnace. Although the new heating system was a big expense, I felt better knowing we were relying on a safe, energy efficient piece of equipment. The new furnace keeps our house perfectly comfortable, even on the coldest of days.