There can be several factors why your air con is not cold when you need it the most. It can be frustrating when you have paid so much for the system and yet it feels like you’re sitting in a sauna most of the time.
Before you consult a specialist, here are six reasons why your aircon is not cold:
1. Air Filter is Clogged
If you have been using the air con for several years and notice that the air con is not cold enough anymore, the primary cause could be a clogged air filter.
Since air cons are fitted with a filter to prevent dust, insects and allergens from entering the room, the screen is often overworked and contaminated. If you feel the quality of fresh air reducing, have a professional change the air filter or clean it.
2. The Coils are Dirty
Another reason why your air con is not cold or warm maybe because there is dirt trapped on the condenser coil. Since the loop catches debris and dirt flowing in and out through the air con, it tends to get overloaded with dirt and debris eventually.
The condenser dissipates heat from the air so it must remain clean to dissolve the hot temperature outside.
A dirty coil disrupts the efficiency of the air conditioner, making it harder to cool the air in the room. So make sure that the loop is clean and well maintained to efficiently cool the room.
3. Coolant is Insufficient
The coolant is the primary agent that circulates the warm and cold air in the aircon. It moves through the coils in the evaporator and cools the air the circulates on it and converts the room air into cold air.
When the coolant level is too less to circulate over the coils, the AC loses its ability to convert the air into the cold air.
For this, you need to call a professional to do a proper aircon gas top up.
4. Defective Compressor
The compressor is the most significant part of an AC unit which is accountable for keeping the air in the room cold. If you are wondering “why is my aircon not cold?”, check the compressor for defective parts.
The compressor is the motor that transmits the coolant through the condenser coil and the evaporator.
If the compressor does not work, it cannot circulate the cold air and prevents your room from getting cold.
5. Faulty Thermostat
The thermostat is the instrument that senses the temperature in the room and commands the AC compressor to start or stop the cooling process in the place. If the thermostat does not show the accurate temperature of the room, or if the thermostat is defective, it will fail to hint the compressor to do the necessary work.
So before you dismantle the whole air conditioning unit, make sure that the thermostat in the room is working correctly and that it shows accurate room temperature.
A faulty thermostat could prevent the air con from cooling, or it may continuously cool if the indicator on the thermostat does not change.
Enery saving tip: Keep your thermostat around the 25 degrees mark for the most efficient use of your aircon.
6. Undersized Air Con
While buying an air con, it is essential to keep the size and the requirement of the room in mind. Many people make the common mistake of installing an air con according to their budget instead of considering the needs of the room and often end up being dissatisfied about the air circulation in the room.
The size of the air conditioner does not determine the cooling power of the unit, but the reason your aircon is not cold enough could be because you are using a smaller aircon in relation to the size of your room.
Use this BTU calculator to get a good estimate of the cooling power required for your room/s.
If your air con is still not cold enough after checking the above six-pointers, there could be other reasons such as a faulty remote and defective parts which would require proper aircon servicing.
Other reasons could be due to a broken control board, old thermistor or motor and choked capillary.
You should also remember that all aircons come with optimum operating temperature. When the air is too humid or when the temperature soars, the air con will not efficiently cool down the air to the required temperature.