I arrived at the customer's house to perform a routine maintenance check on their heating and air conditioning system. I ran the unit in the air conditioning mode to check for a temperature split. I also checked the amps and ohms on both the indoor and outdoor units to ensure they were within the manufacturer's specifications. I checked the wiring and pressure on the outside unit to ensure they were functioning properly. Finally, I performed a radon test to check for any potential radon gas in the home.