What is air cooling system & air conditioner in U.K.?
 

It may sound like a stupid question: when surfing the net for London hotels I came across the amenities and found 3 different terms listed as amenities: air conditioning, air cooling system and mobile air cooling system.

I know what an air conidtioner is, in North America: it provides "refrigeration" - cold air in the summer, but does not provide heat in the winter. Is "air cooling system" basically just a stationary fan like a ceiling fan?? and "mobile air cooling" means a table or floor fan??

In Europe there are mobile air conditioners that sit on the floor and have a hose that drains out a window or door. That doesn't mean that the hotels you are looking at have mobile ac. Air cooling system could mean anything. Just because a hotel advertises ac doesn't mean you can actually use it either. Many countries have rules/laws about when heat and ac can be turned on.

Email the hotel and ask for specifics.

The terms listed aren't really specific.
Older London hotels were built without air conditioning and various solutions have been retrofitted.Many still dont have any ac.
The standard "air cooling system" is probably the window.

We stayed at the IBIS Euston which does not have aircon, but advertises a air-cooling system which we learnt is "Fresh air piped into your room via airducts"
Admittedly this was strange at first but it dried any wet clothing and the room was fairly cool. We always kept the window open as far as it would go - which was 6inches.

Often "air cooling" is airconditioning ducts without airconditioning...i.e. they blow outside air. The advantage over keeping the windows open is that outdoor noise is not as much a problem.

London rarely gets hot, but it can be warm and if you have to keep your hotel room windows open in a busy city...well, good luck sleeping.