Some tips for HVAC troubleshooting include checking the thermostat to ensure it is in cooling mode, according to JohnBurgerHVAC.com. Users should also ensure the temperature is set correctly.
Another tip is to check the cooling unit on the outside. If this unit is not running, users should check the breaker box to make sure that a breaker has not flipped or become so weak that it does not function. Users should also pull out the filter inside the unit. If too much build-up occurs on the filter, it can prevent proper airflow. Return grills should also be checked to make sure they are not blocked in any way.