|How many case cooling fans do you have & how are they arranged?|
Generally, all you need is one exhaust fan in the rear. Side panel fans are not recommended because they disrupt the desired front to rear airflow. Some people install a front intake fan but it's usefulness is debateable.
You're only ventilating a small box that's about 2 CF in size, not an entire house. For easy math, let's say a single exhaust fan can pass 60 CF of air per min. That means that all the air in the case is completely refreshed every 2 seconds. Do you really think you need a boat load of fans to keep a case cool?