My household had sinus issues since we moved into our new/old home. The filters came out looking like lint filters in the dryer. I knew I had to call these guys. They work hard for their money. They don't take breaks. They are there to get the job done well, but they have all the time in the world to answer questions. They were at my home for 8 hours and pulled out all sorts of things from the HVAC...including a teddy bear. Heat works better and our sinuses are better. Don't hesitate about calling them. Do yourself and health a favor. Just do it! You won't regret it.