The different between cooling only and reverse cycle units There are two main types of air conditioning units to choose from, i.e. cooling only units and reverse cycle units. A cooling only air conditioning unit can cool and filter your air but a reverse cycle unit can do this as well as offer you the offer of switching to a heating function. The reverse cycle unit is generally more expensive but it would be more cost effective in the long run if you find that you make use of a heater a lot during the cooler seasons. Should you choose a wall hung, window mounted or a ducted split air conditioning system? All split air conditioning systems are generally quite quiet and space efficient. Wall hung and window mounted split systems are capable of cooling one room. This is the option if you are only looking for an air conditioning unit for one particular space such as your living room or home office. If you are looking to air condition the whole home or building then the ducted split air conditioning system would be more suitable. This system uses ducts to directed the cool air to each room in the building. Choosing between carbon and electrostatic filters The carbon filter and the electrostatic filter are the two most popular types of filters used to purify the air. Active carbon filters need to be replaced regularly. Electrostatic filters are becoming the more popular option because they only have to be cleaned every once in a while. There would be no replacement costs when choosing an air conditioner than uses an electrostatic filter. Electronic vs. manual controls on the air conditioner Most of the older air conditioning units made use of manual controls in the form of dials that were not very accurate. Electronic controls that allow you to tweak the temperature settings to the exact degree of your choice are the ideal option. This is because adjusting the temperature so accurately will ensure that your air conditioning is set to precisely suit your individual comfort level.