Why is my AC running constantly but never reaching the set temperature?
The system is producing some cooling but not enough to keep up with the heat entering the house. Common causes are a low refrigerant charge from a leak, a dirty condenser coil that cannot reject heat, restricted airflow from a loaded filter or a fouled evaporator coil, and a compressor that is losing capacity. In Florida, extended run times during the hottest part of the day can be normal — the flag is when the temperature never comes down at all.

