You bought your air conditioner for a purpose. That is why it is really frustrating when it does not work the way it should. Nothing is more annoying than your A/C blowing warm air on a hot day. We understand that you want to get to the bottom of the problem before the scorching temperature melts your patience away. Below are some of the reasons why your A/C is blowing warm air:
More often than not, warm air from an A/C is caused by an incorrectly set thermostat. The thermostat regulates the temperature through the fan in the air handler of your A/C. Before calling and appearing silly in front of an expert, check that the thermostat is not set to ‘heat’. Someone might have bumped or accidentally adjusted the setting. Also check whether it is set to ‘on’ or ‘auto’. If it is set to ‘on’, then you’ve found the culprit! ‘On’ makes the fan work round-the-clock even when the air is not actually being cooled. Be sure to set it to ‘auto’ so that the fan will only turn on when cooling is needed.
Unrestricted airflow is very crucial for your A/C to work properly. Clogged or dirty air filter is the worst enemy of airflow as it prevents your A/C from cooling normally. To prevent this from happening, make sure to regularly check your air filter. A dirty air filter means you need to clean or replace it.
The condenser or the outside unit of your A/C is responsible for dispersing heat from the refrigerant. When it gets dirty or obstructed by debris or tall grass, it becomes more difficult for the unit to disperse heat and for the A/C to cool the air. See to it that you clean the condenser unit at least once a year. Be careful though as there is always the risk of bending condenser coil fins, which will restrict airflow.
Another reason for warm A/C air is low refrigerant. Refrigerant is a heat transfer substance that absorbs heat from the air, enabling things to cool or freeze. Obviously, when refrigerant is low, the air gets warmer as heat is not absorbed. Unlike gas, refrigerant does not deplete. The only way your refrigerant could get low is when there is a leak. Hissing and bubbling sounds from the air conditioner are the typical indication of a leak.
Ask yourself when was the last time you had your A/C checked. Like every other object, your A/C needs to be maintained regularly for it to function normally. Do not wait until something is wrong before you tune up your unit.
Now that you know the causes of warm A/C air, you are better equipped to handle the problem, right? Not so fast! You have to remember that causes of warm A/C air can be classified in two: those that you can handle on your own and those that require the assistance of an expert. As a rule of thumb, when in doubt, always choose a professional heating and cooling expert over DIY solution.
Written by APM Construction Services, a construction and home maintenance company that is the best choice for heating and cooling in Columbia, MO.