Every so often it is great to get your central heating and air conditioning system cleaned in a detailed manor. To do this all you need to do is call your local heating and cooling company to ask them to come out and do a detailed heat and a/c cleaning. This will consist of them taking apart your central heating and air conditioning unit and cleaning it real deep with a water hose and other special things. Then on top of that, they usually include a standard (but not deep) ductwork cleaning as well. If you wanted a deep ductwork cleaning involved in your detailed heating and air conditioning unit cleaning you would most likely have to pay extra for that. I recently had my central heating and air conditioning system unit cleaned with one of those detailed HVAC unit cleanings and I can tell you that my heat and a/c works so much better! The air flow is stronger and the noise that the central heating and air conditioning system makes when it is running is a lot lighter now. To be honest it almost non existent. And the ductwork cleaning that they did even helped to improve the air quality in my home as well when the central heating and air conditioning system is running. A lot of times bad air quality comes from the air vents of your central heating and cooling unit if you do not have your ductwork cleaned on a regular basis. So for me, this is all great and I am very satisfied with the whole experience of my detailed HVAC cleaning.