I was called to a home to perform routine maintenance on a central air conditioning system. I checked the filters, verified the airflow, and found that the blower was working properly. However, I noticed a wasp nest in the outdoor unit. I also noticed that the unit was low on refrigerant, which could have been the cause of the wasp nest. I corrected the temperature split by adjusting the thermostat and refilled the refrigerant to ensure optimal performance.