My HVAC unit was running but not cooling properly. I called an HVAC guy who came to check. He came without a scale and told me he can fill the refrigerant and tell me how much he filled by just telling me the pressure.
After just about 5 minutes he told me he filled 1 lb. Did i got ripped off? How long does it take to add 1 lb? What is the best way to find how much did he add? is it possible to measure this by just looking at pressure gauges?