Some people have a very good feeling after they get their home professionally cleaned. As for me, although that is good and fine, I get a really great feeling after I have the ductwork of my central heating and air conditioning system cleaned! I have my ductwork cleaned 3 times a year. Most people do not have it done that often, but I do because I have a really great HVAC service plan that gives me a wonderful discount on all ductwork cleaning and other HVAC work throughout the year. After a good ductwork cleaning, when my central heating or air conditioning system comes on (depending on the time of the year), it just blows out the most wonderful air quality without the use of a whole home air purification system. That is how clean my ductwork is! I even had my indoor air quality tested a few times by an air quality professional service here in my area, and they even commented on how my home has some of the best indoor air quality they had ever seen! It really boils down to having clean ductwork I guess. Central heating and air conditioning systems that do not have their ductwork cleaned too often are usually the main cause of bad indoor air quality. This is what I was told by both my local heating and air conditioning company as well as the air quality experts that tested my air quality. Ductwork cleaning is the key to a better quality of life. And it is also the key to top quality central heating and air conditioning!