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An air conditioner's filters, condensing and evaporating coils require regular maintenance for the unit to work effectively and more than ever before, efficiently. Neglecting the servicing and maintenance of your air conditioning unit will not only hinder its performance, but will increase its energy usage and therefore your energy bills. 

Find out more on why it's important to service and maintain your AC unit.

Fixing Air Conditioner

Air Conditioner Filters

The most important maintenance task that will ensure the efficiency of your air conditioner is to routinely replace or clean its filters. Clogged, dirty filters reduce the amount of airflow and significantly reduce a system's efficiency. In addition, when airflow is obstructed, air can bypass the filter and deposit dirt directly into the evaporator coil and therefore impair the coil's heat-absorbing capacity. Replacing a dirty, clogged filter with a clean one can lower your air conditioner's energy consumption by 5% to 15%.

For central air conditioners, filters are generally located somewhere along the return duct's length. Common filter locations are in walls, ceilings, or in the air conditioner itself. Room air conditioners have a filter mounted in the grill that faces into the room.

Our technician can clean or replace your air conditioning system's filter(s) every month or two during both the cooling and heating seasons. Filters may need more frequent servicing if the air conditioner is in constant use, is subjected to dusty conditions, or if you have pets in the house.

Air Conditioner

Air Conditioner Coils

The air conditioner's evaporator coil and condenser coil collect dirt over their months and years of service. A clean filter prevents the evaporator coil from soiling quickly. In time, however, the evaporator coil will collect dirt. This dirt reduces airflow and insulates the coil, reducing its ability to absorb heat. To avoid this problem, as part of our maintenance services, London AC Technical Services' technicians will check your evaporator coil every year and clean it as necessary.

Outdoor condenser coils can also become very dirty if the outdoor environment is particularly dusty or if there is foliage nearby. For maximum efficiency, you should try to minimise dirt and debris near the condenser unit. Cleaning the area around the coil, removing any debris, and trimming foliage back at least 2 feet (0.6 meters) will allow for adequate airflow around the condenser.

Standing Air Conditioner

Air Conditioner Coil Fins

The aluminium fins on evaporator and condenser coils are easily bent and can block airflow through the coil. If required and it's possible to do so, our technician will comb the fins back to their original condition as closely as possible or replace completely if requried.


Air Conditioner Condensate Drains

Blocked drain channels prevent an air conditioning unit from reducing humidity, and this could result in excess moisture, which in turn may discolour walls and/or carpets. If badly maintained, you will notice this more in the heating seasons. Our technicians can clean the AC condensate drains as part of our service & maintenance works, leaving you with a more efficient unit and less likely to repair/replace any other damaged items caused by a blocked drain.


When your air conditioner needs more than regular maintenance, such as when it does not reduce the indoor temperature to a comfortable level, a professional service technician will be needed. During our service and maintenance works, we can find and fix problems in your air conditioning system.

London AC Technical Services technician will:

  • Check for the correct amount of refrigerant

  • Test for refrigerant leaks using a leak detector if the system is working poorly

  • Test AC in both heating and cooling modes

  • Check coil temperatures in both heating and cooling modes

  • Check for and seal, duct leakage in central systems

  • Measure airflow through the evaporator coil and record temperatures in both heating and cooling modes

  • Inspect electric terminals, clean and tighten connections

  • Oil motors and check belts for tightness and wear in central plant

  • Check remote control panel for any faults

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