No air conditioners FAQ page would be complete without an answer to the most elementary question. The best description of how they work is as a fridge does but backwards. In the same way that fridges and freezers use heat transfer coils, piped refrigerant and a compressor, air conditioners take heat from inside and transfer it to the outside, and have a fan to ensure that sufficient air (therefore heat transfer) is pushed through the cooling fins.

An air conditioning system is designed to provide cooled and/or heated air throughout a room or building. Filters are used to remove particulates from the air, and the cooling process also helps to dehumidify it. Air conditioning can also improve air quality, making the environment more comfortable for the occupants in the building.
The answer is both. These days, units that include heat pumps provide heating as an addition to cooling. Quite often, this is very economical to run when compared to other forms of heating systems.
Before air conditioning equipment can be installed, planning permission will usually have to be obtained. However, as there are a vast number of potential installation settings and circumstances, it is advised that you discuss the proposals with your Local Planning Authority before appointing an installer.
Air conditioning is not that expensive to run. Although costs can vary from installation to installation, and are co-dependent upon a number of factors, including the running time of the unit, and the heating and cooling loads, air conditioning is usually quite economical.
Hanstock Air-conditioning covers all of the mainland UK (including Northern Ireland, using carefully selected and vetted sub-contractors)
What usually happens, is that the condenser will overheat, leading eventually to failure. This sometimes happens if a pre-charged unit and condenser is connected with the refrigerant lines being longer than the standard supplied, and not topped up with extra refrigerant to fill the additional volume.