I was called to a home to repair a broken air conditioner. Upon arrival, I discovered that the unit was out of refrigerant. I added 4.5 pounds of refrigerant to the system and found that the temperature difference between the indoor and outdoor units had decreased from 18 degrees to 12 degrees. The customer was paying for heating, ventilation, and air conditioning (HCH) payments, and I was able to resolve the issue and get the customer's system back up and running efficiently.