One thing I found out from my local heating plus A/C business is that getting your ductwork cleaned every 6 months is a entirely wise thing to do! When you do not get your ductwork cleaned every 6 months this can cause troubles with the air quality in your home! Not to mention, it can also make your central heating plus air conditioner work overtime, however and when your central heating plus air conditioner works overtime this can cause to heat plus air conditioning break downs. And of course, I do not have to say that heat plus air conditioning break downs means spending money on Heating plus A/C repair… Periodically it can even lead to having to buy a brand current plus modern central heating plus air conditioner all together! This is something you for sure do not want to happen before your central heating plus air conditioner has run its course, but usually that is at least 10 years, sometimes even 15 years; So consistently get the ductwork of your central heating plus air conditioner cleaned every 6 months plus you will be a lot better off all around with your indoor comfort, your air quality as well as extending the life span of your central heating plus cooling component without question, but ductwork cleaning is a entirely important area of heating plus cooling maintenance! Do not let it slip by you. I have my ductwork cleaned every 6 months ever since I found out about this from my friendly plus local heating plus A/C worker.