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Air Conditioner Not Cold Enough

The 9 most common part(s) or condition(s) which contribute to the symptom Air conditioner not cold enough are listed below. Check or test each item and watch any available videos. If you are still unable to solve the problem you may need to do additional research and troubleshooting. Remember, with our 365 Days. Period.® return policy you can return any part for any reason. So, go ahead and buy it to try it. No other parts retailer offers this unconditional return policy.


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For the symptom you selected, these are the most common parts or causes, ordered by the likelihood of fixing the symptom.

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Air Filter

If the air conditioner does not cool, the air filter might be clogged. If the air filter is clogged, air cannot flow through properly which greatly reduces the cooling capacity of the air conditioner. Either clean the air filter or replace it as needed.

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Other Causes and Conditions

Condenser Coils are Dirty

If the air conditioner is not cold enough the condenser coils may be dirty. The condenser is like a radiator and must stay clean in order to dissipate the heat which was removed from the air. As the coils get dirtier the air conditioner becomes less efficient, which makes it work harder to cool the room. If the coils are dirty enough, the unit will never be cold enough and will not be able to cool the room.

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Compressor

If the air conditioner does not cool, the compressor might be defective. The compressor is a motor which compresses the refrigerant and circulates the refrigerant through the evaporator and condenser coils. There are several other components which are more likely to be defective if the compressor doesn't work. If the compressor itself is defective a licensed professional will need to replace it.

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Thermostat

If the air conditioner does not cool the thermostat might be defective. The thermostat is a sensor which detects the room air temperature and a switch to provide power to the fan and compressor. If the thermostat is defective the air conditioner does not cool or may cool continuously.

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Thermistor

If the air conditioner does not cool the thermistor might be defective. The thermistor is a sensor which detects the room air temperature. It is connected to the control board. If the thermistor is defective the air conditioner does not cool or may cool continuously.

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Control Board

If the air conditioner does not cool the control board might be defective. The control board regulates the power supply to the compressor and fan motors. If the control board is defective some parts of the air conditioner might work properly. Control boards are often misdiagnosed, check other components first before replacing the board.

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Temperature Control Thermostat

If the air conditioner does not cool enough the temperature control thermostat might be defective. The thermostat is a sensor which detects the room air temperature and a switch to provide power to the fan and compressor. If the thermostat is defective the air conditioner does not cool or may cool continuously.

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Temperature Control Board

If the air conditioner does not cool the temperature control board might be defective. The temperature control board provides the voltage to the fan motor and compressor. These boards are often misdiagnosed. Check all other components to be certain this is the cause of the problem.

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Run Capacitor

Every air conditioner has a compressor motor. Every compressor has a run capacitor attached to the electrical leads. If the run capacitor burns out the compressor will not run. The run capacitor can be checked with a special meter to see if it is defective.

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