I've watched a lot of your HVAC videos. I've learned so much from your channel that I now feel confident I could replace an entire AC system myself—and do it the right way. When I inspected the original system that came with my house, I discovered it didn't even have a filter drier installed. Amazingly, it still worked for more than 25 years. Eventually, it developed a refrigerant leak because the liquid line was rubbing against the brick where it exited the house due to vibration. I was able to repair the leak and install a filter drier because of what I learned from your videos. I really appreciate your enthusiasm for teaching and the time you put into creating such educational content. Keep up the great work!