Only install if absolutely necessary
Nothing beats cross, natural ventilation from open doors and windows or the use of fans, to cool your building. Only install an air conditioner if it is absolutely necessary.
The performance of air conditioners is measured by its COP (sometimes CP) which is the ratio of the heating or cooling provided over the electrical energy consumed. These days there are very highly efficient air-conditioners available. If you have an old technology ‘room’ air-conditioner in your building, consider replacing it with modern inverter technology to optimise energy savings. All air-conditioning systems need to be properly maintained to ensure energy efficiency.
There are two types of air-conditioners:
1.) Room Air-Conditioners
Cool a single room rather than the entire building. These traditionally feature a one way cassette and are wall mounted.
2.) Central Air-Conditioners
circulate cool air through a system of supply and return ducts. They can either be split-system where an outdoor cabinet contains the condenser and compressor, and an indoor cabinet contains the evaporator or a central system, where the air conditioner, the evaporator, condenser, and compressor are all located in one cabinet, which usually is placed on a roof or on a concrete slab next to the house’s foundation. Ideally in a central system, a variable capacity compressor linked to multiple indoor units should offer each unit their own individual temperature control.