Why is My Air Conditioner Not Cooling the House?

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There are many different reasons as to why your air conditioner may have stopped cooling your home.

The most common reason for this is the filter being dirty or requiring replacement.

When the filter is blocked, it cannot filter the air correctly and therefore will not cool the air in turn.

Thinking that your air conditioner has broken entirely is a worry, but actually, the likelihood that it cannot be fixed is very slim.

Air conditioners require the perfect balance of pressure, temperature, and airflow so that they are able to work effectively.

Repairing your air conditioner if it has stopped cooling your house isn’t always as expensive as many people fear.

Imperfect Instalment.

If your air conditioner is fairly new, there is a likelihood that it has not been installed correctly if it has ceased to cool your home.

Alternatively, the wrong sized unit could have been installed in your home.

The best thing to do to solve either of these problems is to arrange for another air conditioning company to do an inspection.

This way, they will be able to flag up any issues if there are any with the initial installment.

Condenser Clogs.

One of the most common but overlooked cooling preventatives for an air conditioning unit is when grass and weeds get caught in it.

See if doing some cutting back of the area surrounding the condenser solve your problem and help the air con to commence cooling once more.

Sometimes, because the condenser lives outside, grass and weeds aren’t always the problem, but general, everyday dirt can get clogged.

This can include leaves during fall.  If you have not cleaned the condenser, try this, as an air conditioner needs good airflow from the condenser to work properly.

Airflow Angst.

If the amount of air being pushed through the vents of your air-con unit is limited, you will never feel cold even if the air con is changing the air temperature around you.

If the airflow is not effective, there is most likely an issue with your filters.

Have a look and see what condition your conditioning filters are in.

The possibility is that they are dirty and if so, they require immediate replacement.


See if any breakers have tripped. Sometimes this is obvious, other times not so.

Be aware that breakers can be tripped but don’t always switch into “off” mode.

To reset them, flip them all off (there are always two, sometimes three) and then turn them all on again.  This may be the solution to your problem.

Thermostat Malfunction.

This is a common default but hard to visibly see. The only obvious sign that your thermostat has malfunctioned in some way is if the display screen has gone blank.

There are many different causes for a malfunction, including empty batteries, circuit problems, and too many conditioning zones all being connected to the same air conditioning system.

The easiest change to make here is to replace the batteries for new ones and see if the air conditioner kicks in.

More severe thermostat issues linked to the electric board or wiring will require a professionally licensed installer and may require a new thermostat altogether.


Are the evaporator coils frozen?  Strangely, when the coils are frozen, the air will only be hot.

If the evaporator coils located behind the air filter on your air conditioner are frozen, then you need to turn your air-con unit off.

This needs to be left for at least 24 hours to allow it defrost thoroughly and manually dry out.

Not an ideal solution in the summer admittedly, but at least it hasn’t hit you too hard in the pocket!

If the evaporator coils are not frozen, you could also look to see if they are dirty.

If so, use a toothbrush to gently manipulate the dirt off the coil, making sure that you do not bend the coils or cause any damage.

If the dirt is difficult to shift, trying using a little water on the toothbrush to help slacken the dirt.

If you still cannot remove the dirt, you need to call out a certified technician to clean the coils for you using a special chemical spray.

Don’t Refrigerate Too Late.

The singularly most common reason as to why an air conditioning unit stops cooling the home is when it has insufficient refrigerant within it.

An air conditioning unit needs refrigerant to produce cool air, and when the levels are too low, this process cannot happen.

This is not something advisedly done yourself as you need specialist equipment and a way of disposing of the old refrigerant safely.

It is best, as stated on the Best of Machinery website that you call out a licensed professional air conditioning company to aid you with this process.

Stay Cool.

It’s easy to get frustrated when you are too hot, especially when you are tired, too.

But when it comes to solving air conditioning problems, it is best to stay as calm as possible and have a methodical approach to find the right solution.

There are many different possibilities as to why your air conditioning unit is not cooling your house, but take a look at this list provided by Top Gear House and narrow down the issues.

The chances are that it is nothing too severe or costly, as it most likely just needs a good clean in one specific or multiple different areas.

Checking the filter is always the best place to start!

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