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Home / Tips and Tricks / An extreme heat wave is coming. What to do if your air conditioner does not cool down?

An extreme heat wave is coming. What to do if your air conditioner does not cool down?


Simple corrections can be helpful if you are in contact with the air conditioner.

Tyler Lizenby / CNET

A heatwave spurs the National Meteorological Service to issue heat warnings for nine US states, forcing 200 million people in the US and Canada to prepare for extreme heat. In addition to some serious health hazards from temperature spikes, turning up the air conditioner can put a strain on an overburdened system, especially if you insist on keeping the cold room indoors cold.

If your thermostat is set to 70, but your home feels like 90, there may be a problem with the air conditioner. No reason to panic.

Regardless of whether you have a central air conditioner or a window unit, there are several ways to fix cooling problems without requesting a repair.

Do not worry, these tips do not require any dangerous or technical measures. These are simple solutions that anyone can try.

Change filter

Problem: The cooling of your room or house takes longer than usual.

Fix: It is probably time to clean or Change the air filter on your air conditioner, depending on whether you have a reusable or disposable filter.

Remove the filter (you may need to check the air conditioning manual to find it) and hold it against the light. If you see no light coming through it is clogged with dust. This obstructs airflow and your device is less efficient.

If you have a disposable filter, simply replace it with a new one. If it is a washable filter (refer to your manual again), fill a tub with a few centimeters of warm water and a few drops of mild detergent. Let the filter work for 10 minutes and then rinse with clear water. Shake the excess water out of the filter and let it air dry before reinstalling it.

Check if the device is frozen The room will not be cool.

Fix: Sometimes, with an air-conditioning system running continuously to keep up with the heat, the evaporator coil freezes. Place your hand on the side of the device near the filter. If it feels very cold, it is probably frozen inside. It may even be ice on the device.

Turn off the cooling mode and turn on the fan to defrost the evaporator coils. Make sure the filter and coils around the filter are dust-free. Dust can also cause an AC unit to freeze.

Thawing can take several hours. So you should go to the mall or the cinema while waiting.

Very important: Do not use your air conditioner in a cool environment if you suspect it is over frozen. This can destroy the compressor (an important component) and lead to costly repairs. Either switch off the fan only or the entire device until the ice melts.

Now running:

Defeat the summer heat with this DIY air conditioner


Check the vents.

Problem: They have central air and one room does not cool, but the others do.

Fix: This seems to be obvious, but check the vents in the room, especially if they are on the floor. Dirt particles may have entered and blocked the passage of air, or a toddler may have stuffed sound into the vent (it has happened). In any case, unscrew the vent plate and scoop out anything that could block the airflow.

Washing Clothes

Problem: You have tried all these corrections, and the air conditioner is still not cooling properly.

Correction: The outer vents may be clogged. Disconnect the window unit from the mains or turn off the circuit breaker for your outdoor unit. Spray any part of the device outside the window or at your house with a water hose to remove dirt, leaves, or bugs that might block the airflow. You can also use a large cleaning brush to remove dirt from the grates.

Contact the professionals. You do not want to damage your air conditioner or cause serious, costly problems to stay cool.

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