central AC UnitCentral ACs are designed to cool your home continually to the desired temperature level. The coolants used are meant to last the full lifespan of the AC. However, this may not be the case because of instances of wear and tear, accidental damage, contaminants as well as other issues that may spring up. In these circumstances, the AC may need a charge of coolant. Finding out the issue in advance can help you avoid adding coolant to the AC unit while in actual sense it doesn’t need it.

The Thermostat

This is the first component to look at if you have any reason to suspect that your AC has lost its charge of coolant. At times, AC units only need a reset to trigger the electronic elements of the system. To do this, set the thermostat to around 85 degrees and then wait for about half an hour before adjusting it to 60 degrees and again waiting for it to kick on. If the house starts cooling then it was a simple reset.

Alternatively, you can reset the unit directly at the source or flip the breaker to the air conditioning unit. In addition, you can also inspect the thermostat unit itself by removing the plate cover so as to see whether the components are sticking due to dust or humidity buildup.

The Vent System

Where the vents are blowing air at room temperature instead of cold following a cleanup of the thermostat and a reset of the unit, then this could be a sign that your coolant in the AC is out of charge. You can check this by holding your hand directly in front of the vents to feel the warm air. Give the machine approximately 15 minutes to tell whether it was just residue air that was coming out of your vent system or not. If the air still feels warm, then chances are high that you have a coolant problem and you may need to call a technician.

Frost Buildup

The AC coolant is in gaseous form and it may freeze elements when it comes into contact with them. It is very easy to detect leakages because frost builds up around connectors such as the point at which the AC connects to the coolant tank. The buildup may also be on the surrounding tubes, hoses, fan motors and others. If you have checked the thermostat, reset the unit and established that it is blowing warm air, there are high chances that you may have a leakage and the coolant in the system may be running low.


AC units should be regularly cleaned so as to keep debris and dirt off. All units have filters but with time, they become clogged. In addition to this, outdoor units may have their covering panels loosening from wind gusts during storms. This may cause the fans to stop working hence no air will be pushed through the vents.

Ensure you check the system first for dirt and debris and cleanup everything before contacting a technician for a coolant recharge.

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