Derek Cole explains that low refrigerant stops your AC from moving heat outside. Adding Freon won't fix it because an AC system is closed, like your body. If you're topping up 1-2 pounds yearly, you have a leak that needs repair, not refills.
Chapters
The refrigerant is low, it has trouble removing heat and putting it outside where you want it to be. Now, a common misconception is that I need a little bit of Freon, I need a couple pounds of Freon. That shouldn't be happening. You have a closed system. Your AC system is like your body. Your body is a closed system. You know, I shouldn't be bleeding out of my arm right here. If I'm bleeding out of my arm, I should fix the leak, right? I should fix the leak. You should fix the leak if you have a refrigerant leak. If you're constantly needing 1-2 pounds of refrigerant every single year, you have a leak. You need to get it fixed, okay?