Central air conditioning systems, and by this I mean systems that have an outlet in each room, are far better than air conditioning units that only service one room each. Central air conditioning systems use one central cooling unit to supply cool air to every room simultaneously.
Central air conditioning systems, as opposed to split air conditioning systems are usually more efficient and less expensive to run. The central A.C. units will also run off gas, whereas the stand-alone units will be electric. This is because central air conditioning systems can cool all the rooms at once, perhaps using thermostats, whereas split air conditioning systems typically only cool one room at a time.
This means that you have to keep the doors shut to get any effective benefit from stand-alone aircon units. Every time you go to the kitchen for a drink, you let warm air in and the aircon unit has to work that much harder again.
On the other hand, if you use one of the central air conditioning systems, you can cool typically up to seven rooms in two zones with just one cooling unit, which can be located outside, in the basement or even in the attic. This means that central air conditioning systems are quieter too.
The cool air is fed to its destination by ducting and because it is cooling several or all of your rooms at once, you can walk about your house as you normally would, only keeping external doors closed for the sake of cool air escaping. These indoor air quality systems allow better performance, higher energy efficiency and a more constant temperature for greater comfort.
Central air conditioning systems consist of indoor and outdoor units and the ducting to distribute the cool air. Furthermore, most central air conditioning systems can be installed in such a way as to make use of any existing heating ducting too. The compressor unit is kept outside or in the basement, because it emits a certain amount of heat and noise.
The evaporator unit is kept indoors and could be next to your central heating’s main induction vent if you have one and you want to try combining the both systems. The savings possible by using the ducting for both air conditioning and heating systems can be considerable and much more attractive to look at too.
Central air conditioning systems’ costs vary considerably from type to type, but one of the main deciding factors is how many rooms do you want to service and what is the volume of air within them. Other factors can be whether your windows and doors fit closely, whether children (or adults) are constantly in and out and whether you have cat or dog flaps.
However, as a general rule of thumb, you could work on the principle of about $7,000 for a typical three or four bedroomed house. You can save half of that if the ducting is already in situ.
Before buying any equipment, especially the more expensive items, you will have to shop around. First of all, do what you are obviously doing now, look on the Internet. On sites like this you will find advertisers of different models of central air conditioning systems, contact some of them and request further information and rough air conditioning price quotes for the models of central A.C. systems you are interested in.
Look in Yellow Pages too and do the same. Ask friends who did their installation and finally, when you think that you understand the terminology and know roughly what you want, get some quotes for your favorite central air conditioning systems from bona fide expert HVAC contractors.