Why is my Ac not Blowing Cold Air?

10. Dezember 2021 | Air Conditioner

How often do you hit your head because the air conditioner has been acting up? If it’s happening quite often, you either need to find the root cause or replace it altogether. If your air conditioner is doing everything but cooling your room, it is a sign that things need fixing.

There could be multiple reasons why your AC isn’t blowing cold air. It could be something as trivial as a clogged filter or something as severe as a circuit problem. If you are confused about the faulty air conditioner and what’s causing it, this article should give you enough ideas about it.

Problems YOU can fix

Problems YOU can fix

Sometimes, something as simple as an incorrectly switched thermostat is a reason why your air conditioner isn’t blowing cold air. There are a few trivial issues that you can fix yourself, even with the basic knowledge about electronics appliances or without any knowledge as well.

For your convenience, here are a few issues that you can fix.

Incorrect thermostat settings

The thermostat that you use to operate your centralized cooling in your home often comes with multiple settings. The most common one is the „On“ setting, wherein it keeps the thermostat running throughout the day without emitting just cold air or just lukewarm air. So, if you are complaining about not getting cold air in your room, it is likely because the thermostat settings are mismatched. 

You can switch the settings to „Auto“ and check whether that helps cool down the room as well. If that doesn’t work, you can turn down the dial to the lowest temperature settings to see whether that helps or not.

Clean the air filter

The air filter is the most crucial part of the air conditioner. It filters and strains out the dirt particles to emit clean air into the room. A few models of air conditioners in the market come with self-cleaning filters. A few other types of air conditioners in the market come with an additional feature of automatically shutting down when the air filters are completely clogged.

A clogged air filter is often one of the primary reasons behind the affected airflow, especially with the air conditioners‘ outflow of cold air. You can take out these air filters and clean them yourself.

Clogged outdoor unit

The air conditioner comes in two parts – the indoor or evaporator and the outdoor unit or the condenser. The evaporator absorbs the heat from inside the room and expels it out through the condenser. Much like the air filter, even the condenser gets clogged with dirt and excess grease, which block airflow.

You can clean out the condenser with a clean cloth and a gentle spray on and around the aluminum fins. Ensure that you work around the fins and don’t put excess pressure on them or bend them in the process.

Get rid of ice buildup

This is quite a rare occurrence but a reason nonetheless. The dirty coils and filters contribute to unnecessary ice buildup inside the air conditioner, which contributes to the affected cold airflow. In case there is an ice buildup, you need to analyze the cause first and then run the air conditioner in the fan mode to melt off the ice, so it works seamlessly again.

Clean the clogged drain

Another reason your air conditioner isn’t properly working is the clogged drain. The appliance draws the excess moisture out of the room and then expels it out of the chamber via a drainage pipe. But, if you haven’t cleaned it in long, there are going to be excess algae growth inside the drain, resulting in clogged drainage that results in affected airflow into the room.

If the algae growth is extremely high and the pipe is not in the best condition, you need to replace the drainage pipe altogether. But, if the growth is limited, you can make a bleach solution to clean it.

Get the right-sized AC

If the air conditioner is too small or large for the room, it will wear out over time. It is in your hands to choose the right one depending on the surface area of the room it will be fitted into. So, make sure that you keep a check on the same. If you are confused about the ideal air conditioner size for your room, follow our guide.

AC Problems a Professional should Solve

HVAC Repairman repairing an air conditioner

While the above problems are trivial and can be fixed by an amateur, some severe problems need professional attention. Some of them include:

Replace the condenser fan

There are often situations where the condenser fan itself is broken or damaged, not just the clogged condenser. If that is the case with your air conditioner, it needs immediate replacing that a professional needs to undertake.

Repair faulty compressor

If one part of the air conditioner is the most crucial, it is the compressor. If that stops working, there is no way your room is going to cool down. Often, excess dirt around the compressor affects its efficiency but with time, the functions of the compressor can wear off too. A professional repair person will be able to tell what the actual problem is, making it easier for them to fix the issue altogether.

The compressor manages the airflow between the evaporator and condenser. So, if the midpoint is faulty, there are chances that the same will affect the air conditioner’s airflow. A damaged compressor needs immediate replacement, so make sure that you consult a professional immediately.

Check the air ducts

Aside from the compressor, even the air conditioner’s duct system plays a crucial role in the airflow. The duct is responsible for transmitting the clean and cold air into the room. Any tear or damage to the duct will end up affecting the temperature of the airflow. When there is a tear, there are chances that the hot air will escape through the duct, making it harder for the cold air to seep into the room.

Several factors can be influenced by the damaged air ducts, including construction issues and rodent infestation. If that is the case, make sure that you consult a professional for repairing the damaged air ducts.

Check for mechanical issues

Another issue that needs immediate professional assistance is the mechanical issues in the air conditioners. If required, get the insides of the appliance checked by someone professional. Get the filters, thermostat wirings and even the motors checked to see if the fault lies there or not.

Refrigerant leak

Many people don’t pay close attention to this, but a refrigerant leak can further worsen the condition of your air conditioner over time. A refrigerant leak contributes to excess absorption of heat into the appliance, obstructing cold air outflow into the room. If you hear a consistent hissing sound or icy buildup inside the air conditioner, it is likely a sign of a refrigerant leak.

In case you suspect something like this, make sure that you stop using the air conditioner immediately. Fixing a refrigerant leak does require immediate professional assistance, so make sure you call one immediately.

Get annual assistance

If you think that annual maintenance of your air conditioner isn’t necessary, you are highly mistaken. But, lack of annual repairs and servicing is often one of the primary reasons why the air conditioners break down or become faulty over time.

Fix the power issues

Another issue that could contribute to affected cold airflow from your air conditioner is the impaired power issues. Check whether the power supply is optimal and whether it has all the necessary wiring and circuitry needed for optimal function.

If the power board isn’t working efficiently, consult a professional electrician to check the wiring and power properly.

Repair the Thermistor

Another factor that could be contributing to the issue is a faulty thermistor. It is generally present close to the evaporator coil. The main objective of this component is to monitor the incoming air temperature from the power control board. When the thermistor is not working or is faulty, it causes issues with sending proper signals from the power board to the compressor circuit. You must immediately consult an HVAC technician to get the problem fixed and the thermistor replaced before it further affects the air conditioner’s functioning.


It is incredibly frustrating when you walk into your house on a hot day and find the air conditioner faulty. There could be several reasons contributing to the issue, so make sure that you familiarize yourself with the problems first and then think about repair. Always see to it that you tend to the fixable issues in your hand and leave the severe and complicated issues in the professionals‘ hands.

FAQ – Why is my AC not Blowing Cold Air?

FAQ - Why is my AC not blowing cold air

What are the symptoms of a bad AC thermostat?

– It doesn’t turn on

– Doesn’t cool the room enough to accommodate you.

– Ac only works when it wants to (blows air randomly)

A bad AC thermostat symptoms are fairly simple and straightforward, but homeowners like yourself need to know what they entail.

How do I reset my AC thermostat?

If you have attempted to fix the AC thermostat and it still isn’t working, resetting is your next step. This can be done by simply unplugging the device from its power source for a minute or two before plugging it back in. If this doesn’t work, try flipping the breaker off and then on again.

What happens if AC has no filter?

If your AC unit doesn’t have a filter, there is no way for it to function properly. Without the use of a clean air filter, dust and other contaminants will accumulate in the device’s internal components, which can cause them to burn out or malfunction in some fashion.

Can I run my AC without a filter for one day?

You absolutely cannot run your AC without a filter. If you don’t have a replacement air filter, it’s best to purchase one from an appliance store or online before attempting to turn on the device again. Ac units are not meant to function without filters and will quickly start to show signs of wear and tear if operated in such a way.

What if my AC isn’t blowing any air?

If your AC isn’t blowing any air, you will need to check the circuit breaker to reset it. Call an electrician immediately if that hasn’t helped and there appears to be a blown fuse or faulty wiring anywhere along with the switchboard panel. It is a dangerous problem that needs immediate attention.

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