Air conditioning equipment is generally of three types. Whatever your type may be would be easy to establish and once you have established what type of equipment you have at the home or office you can search a company that specializes in that equipment.
Usually if you are in a large building you are likely to have a centralized ducted air system. This type of system works by circulating cooled air around the building. You may also have a centralized fluid based system. In such a system-cooled fluid usually water is circulated around the building to lower the temperature.
You may also have a wall mounted or window type or portable decentralized air conditioner if you are in a smaller office. You will easily be able to distinguish if you have central or decentralized air conditioning by just looking at your equipment or vents. Whatever system you may have on your premises it is important that you get the right air conditioning repair company to service it.
You must also remember that all systems need maintenance irrespective of the size or strength of the air conditioning equipment. Air conditioners are machines that are built to last for long times and they can take a lot of things without complaining but they do have their limits and its best if those limits are not tested because a pinch of maintenance in time is worth pounds of repair at a later time.