The central air conditioners are rated on the basis of seasonal energy efficiency ratio, which is popularly known as SEER. You should know the ratings for central air conditioning before installing one for your home. You will get the best rated models in the catalogues or in the magazines that write about air conditioners. If you have decided to install without consulting the guide, you need to know certain facts regarding central air conditioning.

Air conditioning in its broadest sense means modifying the condition of air for clean wind, either by heating or cooling, through proper ventilation within the system, for thermal comfort. The common understanding of it is that, it carries out the de-humidification act of the indoor air, through refrigeration. An air conditioner can be used as both the annealing equipment as well as a cooling equipment, that has been designed to regulate the temperature of a closed room or an area. That's why, a conditioning system is also called an HVAC system, heat ventilation and cooling system.

Now, there are various models that are rated good, since they use less energy and provide sufficient cooling in less time. They are also automated and regulate on their own, by sensing the room temperature. Some of these models are Amana RSG Ultron central air conditioner, Bryant Two Speed and Puron Plus 598B central air conditioner. They are energy efficient and you won't find your electricity bill going high.

While you decide to buy one, look for the following features:

* It must have the new compressor built, that is known as scroll compressor.
* Choose the one with sound dampening feature, so that it makes no noise that is irritating.
* The warranty period of the compressor must be at least of ten years, and five years for the relative parts.