Air Conditioning

FULL AIR CON SERVICE ALL CARS £35 

Full service
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General info and advantages

Because the UK has a temperate climate many people have assumed that air-conditioning in their car would be a rarely used luxury that was not worth paying for. Now that we have experienced a relatively warm summer (and 2013 being the warmest summer in the UK for over 10 years) the benefits of air-conditioning are gradually being generally accepted particularly as our climate is relatively damp with moist (and thus uncomfortable) air. Moreover the additional benefits that are not immediately obvious are now being appreciated by those fortunate to have a good system operating in their car. As about 80% of all new cars are now fitted with AC as standard since about 2008 almost all of us now have the ability to use this facility even if we only ever buy secondhand cars. Just be aware though that if you buy a two year old car that the AC will not be working as well as it was when it was new – most cars would be needing an AC service by three or four years old.
What are these benefits?
• The ability to reduce the in-car temperature to a comfortable level on exceedingly hot days, without having a seventy mile an hour gale buffeting you and being unable to hear the radio or your passengers because of the wind-noise.
• If you have youngish children you will quickly appreciate the extra quiet in the back – aircon seems to almost magically remove the bad temper from most children.
• As aircon also conditions the air, the ability to remove the moisture from the air coming into the car on really muggy days and to achieve a comfortable atmosphere within the car, perhaps in conjunction with the heater control – the AC button will control the Relative Humidity and the heater if needed will control the temperature leaving you free to enjoy the warmth without being stuffy.
• The ability to be able to see through the windscreen and all the other glass clearly without a film of mist. The safety aspect of aircon is often overlooked but is extremely important, particularly to the people-carriers which are so popular now. Using the AC button to direct the air to the screen the moisture on the glass will be evaporated very rapidly, long before a screen-heater has had a chance to warm up and will continue this advantage around the side glasses and on to the rear screen. For best effect use the AC button, perhaps in conjunction with the heater in winter and on the fresh air setting (not recirculation). AC is usually extremely good at de-misting and this safety aspect of good all round visibility, even when picking up a crowd of wet noisy kids in winter, is one of AC’s strong points. It has to be admitted that very occasionally the climate can be so very damp on odd days that even with the AC working effectively the demisting function can work only slowly but this is very much in the minority – for most days the AC will clear the screen like magic.
• The cleaner, fresher air with low Relative Humidity will enhance driver awareness and help prevent drowsiness making your journeys and those of your loved ones safer over long distances as drivers are better able to remain fresh and alert.
• Being caught in a long traffic jam on a hot day can be purgatory with all the exhaust fumes coming straight into your open windows, particularly if you are dressed for business – wet under the arms and hot under the collar – probably the time when you most wished that you had bought a car with aircon. This is when AC proves it is one of the nicest affordable luxuries.
• All the air coming into a car with aircon passes through a heat-exchanger, which as it is very cold, quickly becomes dripping with condensation, which collects and drains out under the car. Air entering this heat exchanger will contain dust and pollen grains, but by the time the air has passed through this heat-exchanger (called the evaporator) the vast majority of these pollutants will have been filtered out, trapped by the condensate and dripped back onto the road. It is estimated that approximately 80% of all dust and pollen is trapped in this way on each pass through the evaporator – this helps us all but is a source of particular relief to Hay Fever sufferers or Asthmatics, particularly children. Most modern cars now also include a filter to remove most pollen and dust, although frequently called a Pollen Filter it should really be called a Cabin Filter as it is very useful in both summer when pollen is rife and in the rest of the year to remove road dirt and other pollutants such as brake and tyre dust. The AC will simply assist the removal of these pollutants.
• By allowing all car windows to remain closed, even on the hottest days, the aerodynamics of the car remain at optimum, keeping fuel consumption low and exterior noise to a minimum, increasing safety to the driver and passengers. There is a page devoted to the fuel consumption aspect of AC – please read this as there are plenty of urban myths on the use of AC. Tell any lie frequently enough and many people will start to believe it.
Any disadvantages? A couple of minor ones – Opera singers or even actors can find that the dry air can degrade their voice.

Slightly more common though are the wearers of contact lens who may find after some hours in the very dry air that their lens can dry slightly and make the eyes feel uncomfortable.

More important though is the effect on fuel consumption IF THE CAR IS USED ONLY ON SHORT, LOCAL JOURNEYS. On all other journeys over say 15 minutes, especially if used on fast roads, the effect on fuel consumption of using the air conditioning is minimal and it is usually more economical to turn on the AC than it would be to open a window. There is a whole page a lttle futher on in this website devoted to the subject of fuel consumption whilst using AC.

 

Good though Air conditioning is it was not even invented for use with people but was developed for drying paper.

To reproduce colour pictures, printers print one colour at a time on each sheet of paper. One printing method very suitable for reproducing pictures is called lithography and involved printing from a large, flat, block of limestone which was dampened with a water roller before the ink was applied but when the paper came into contact with the limestone it absorbed some moisture from it causing the paper to expand. This made it impossible to print the next colour accurately until the paper had been dried and thus returned to the same physical size as when the previous colour had been printed. So just over a hundred years ago a system was invented and installed into a New York lithographers in order to remove moisture from the air and thus rapidly dry the sheets of paper.

So it was called Air Conditioning because it conditioned the air by the reduction of the moisture it contained. It is not just the cooling of the air which makes it so comfortable to people but it is the reduction of the moisture content and this is why it is just as important in the warm damp climate of the UK as in the hot but dry climate of central Spain.

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Does the AC use more petrol?

The short answer is – yes it does.
But in most cases not much – it all depends on how the car is used. Please don’t be fooled by well meaning journalists with only a limited knowledge of the subject.

For example if you get in your car and drive up the motorway for a hundred miles at seventy miles an hour the amount of extra petrol or diesel used to run the AC is negligible. Indeed if you were to turn the AC off and drive instead with a window slightly open to keep cool, you may well find that the increased drag on the car would increase the fuel consumption more than by using the AC button.

On the other hand if your car is mostly used for short journeys there may be a penalty to pay in petrol for the comfort of continuous AC. For example, you get into a stinking hot car and drive 15 minutes to the supermarket. By the time you get there the car is comfortably cool and you leave it in the full sun for an hour while you do the shop. After the hour the car has returned to its stinking hot status and you need to have the AC on full again for the short journey home. If this is the sort of travelling this car has to do all its life with only short journeys then the fuel consumption is definitely going to deteriorate but after all you get comfort in exchange. For a few minutes each day the compressor is going flat out, taking power from the engine and in addition both the internal blowers and the electric condenser fans are working hard to cool the car down, causing the alternator to work hard to power them and loading the engine further. But if this same car is then used for a long journey, after perhaps ten minutes, once the internal temperature is reduced comfortably, the AC throttles itself back – its done the hard work, now it only needs to keep the car cool and so now the fuel consumption returns to a much more acceptable level.

Similarly if on a hot day you drive along and perhaps note that the fuel consumption on your onboard computer shows 34mpg and you turn on the AC and it immediately drops to 28 mpg it would be easy to assume that you were loosing 6 mpg for the AC. Having read the previous few sentences you can now work out that this simplistic assumption is not in fact correct and that within a few minutes the computer will show a gradual rise to near the point at which it started.

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