 Ask yourself, how long has it been since I had a professional cleaning of my ducts and vents? If it's been a long time or never, guess what? You're before. Now, look closely. Look at that dust. Look at that dirt. Look at that grime. Look at that threat to the health of your friends and family who hang out in your home. And by the way, we're still 80% indoors on average, even though it's summertime, because when it gets hot, people stay inside, right? And do what? Use the air conditioner. And do what? Blow the allergens and the bacteria around. So you get it. You need to clean it. Pretty simple.