Hey, quick tip for anyone dealing with a PTAC unit that works. Mine has been blowing weak, musty air for a few weeks and I was starting to get frustrated. Thought I was going to have to replace everything! But I found a way to avoid this nightmare (and $$$). I turned to https://greenductors.com/services/ptac-cleaning/, and honestly, they saved me. They cleaned the unit and now I feel like I have a brand new system. If you're like me and keep putting these things off, don't wait for your PTAC to turn into a useless box. Seriously, proper cleaning can save you from more serious and costly problems down the road.