Prolonged heat brings small losses of cooling capacity into view.
During Clyde’s hottest, sunniest stretches, an air conditioner has less room to make up for a restriction or weak component. A system with reduced airflow, a dust-coated outdoor coil, a weak condenser fan, failing electrical parts, or duct leakage through a hot attic moves less heat out of the house while the house is gaining more of it. The result is an AC that keeps running but cannot hold the set temperature.
Low refrigerant is one possible reason for poor cooling, but it is not the automatic answer. A charge issue and an airflow or heat-rejection problem can feel much the same from inside the house, especially when the heat has been building through the day. Adding refrigerant without confirming the cause does not address a dirty coil, weak fan, restricted return, or leaking duct.
We check the temperature difference across the system, indoor and outdoor airflow, coil condition, and electrical operation while the equipment is under load. When the readings support it, we also check for a refrigerant leak. That process separates a system with a failing part from one that is losing capacity to a correctable airflow or heat-rejection problem.