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AC not cooling London summer heatwave?

When in summer in London the heat is rising and you are experiencing heat waves, the last thing you want is an air-conditioner that is not properly cooling your house. Regrettably, AC malfunctions and performance problems are not rare, particularly in circumstances when the system has to cope with higher loads than usual to maintain the soaring temperatures. 

When the hot summer months of London are on, and your air conditioning will not perform, it can make your home a brassy sauna. 

1.Why is my AC not cooling and working properly?

Your AC may not be providing you with the cooling power you require, and there are a number of reasons why. The most common causes are listed below:

2.Dirty Air Filters

Clogged or dirty air filters have been listed as one of the most common causes of an AC unit not cooling effectively. When filters become clogged with dust and debris, this limits the amount of air flowing through the system, and the system is not able to effectively circulate cool air.

3.Low Refrigerant Levels

Refrigerant is the material that takes the heat out of your house and puts it out of the house. When your AC is low on refrigerant, it will not be efficient in its work, and it will lack proper cooling. The levels of the refrigerant must be checked and replenished by a qualified technician since it involves appropriate handling and skills.

4.Faulty Thermostat

Your thermostat may not have a proper communication with the AC unit unless it is properly calibrated or it is faulty. This may lead to failure of the AC to cool or run properly. The simplest first things first would be to check the thermostat settings and change the batteries, however, once the issue continues to happen, then it may be necessary to repair or replace the thermostat itself.

5.Blocked Condenser Coils

The heat absorbed by the inside of the home is expelled by the condenser coils of your AC unit that are typically situated on the outside of the home. When the coils are contaminated or blocked by some debris (leaves, dirt, and even pet hair), the system will not release the heat, and its cooling performance will be poor. To ensure your AC is operating at its very best, you can get the condenser coils cleaned on a regular basis.

6.Frozen Evaporator Coils

In case the coils in the evaporator (within the AC unit) are frozen, the system will not be able to absorb and give out heat as it should. Freezing may occur when refrigerant is low, there is poor air flow or when the air filter is blocked. Once the coils have frozen, then your system will not cool as quickly and may even turn off. When you find the accumulation of ice, then it is time to switch off the AC and call a professional technician to find out what is wrong and how to repair it.

7.Poor insulation/ Leaks.

In case you have a window and door air leakage or poor insulation in your house, your AC may not be able to cool the house temperature indoors. The air will still leak out even in the event that the AC is in good condition; one should expect air to escape and hot air to get in putting the cooling mechanism to the test. Leaks can be a big variance on the overall temperature of your home, which can be ensured by properly insulating the home and sealing leaks.

8.How to Do It When Your Air Conditioning is not Cooling a Proper Temper.

When you discover that your AC is not cooling when it is hot, you can trouble shoot the problem following these steps:

10.Check the Thermostat

Make sure that your thermostat is turned to the mode of cooling and that the temperature is adjusted to be lower than the surrounding room temperature.

11.Clean or Change the Air Filters.

You might not have changed your air filters recently and they may be full of dust and this decreases the flow of air. 

12.Inspect the Condenser Coils

Look at the external condenser. When it is in dirt, or leaves, or rubbish, it would not be able to get rid of the heat as it should..

13.Confirm the Ice Ice on the Coils of the Evaporator.

In case you find ice or frost on the inside coils of the unit, switch the AC off as soon as possible and allow it to defrost. The presence of ice accumulation indicates airflow issues or a decrease in refrigerant which should not be handled by an amateur.

14.Ensure Proper Airflow

Ensure that there is no obstruction over the vents or duct work. Blocked or closed vents may stop circulation of cool air in your house. Open all the vents so that air is allowed to pass.

15.Close Gaps and Seal Leaks.

Check around doors and windows that may have cracks or gaps through which cool air may get out. These leaks can be insulated and sealed appropriately to ensure that warm air does not enter them and load on your AC system.

16.When to Call Fixhelpia to repair AC in London.

When all the above steps have been put into practice and the AC is not cooling correctly then it is time to call in a professional. Our company, Fixhelpia is based in London and specializes in repairing and maintaining air conditioners at Fixhelpia and can assist in getting your system up and running in a short time. Our experienced technicians are capable of:

17.Check and clean refrigerant levels.

Fix or change broken thermostats.

Filter condeners and repair airflow problems.

Discuss frozen evaporator coils.

Identify more complicated problems such as compressor problems.

We are emergency workers and we can assist in the case of a summer heatwave where immediate response is other important to restore the comfort in your house.

18.Tips of Preventive Maintenance on the AC.

To prevent them in the future, it is better to plan regular maintenance of your AC unit. Annual checks will be done to make sure that everything is functioning well and avoid expensive failure during heat waves. In the course of these exams our technicians will:

Clean air filters and coils

Check refrigerant levels

Check the wiring and thermostat.

Ensure proper drainage

Regular servicing is likely to increase the life of your AC and have your house cool and comfortable throughout the summer.

When you are in London and your air conditioner is not cooling properly, begin with troubleshooting the easiest ones, which are inspection of filters and coils. But, when it comes to more complicated problems, such as refrigerant leakage or broken parts, one will need professional repair. Fixhelpia is the company that comes to your rescue in order to keep you cool in scorching summer heat waves in London by offering quick and trusted air conditioning service. Call us now and get your AC repaired and you can be sure that your home will be comfy regardless of the temperature outside!

✍️ Author:

📅 Published: 7 August 2026