Window air conditioners are a kind of air conditioner that is purposely designed to cool a small space, like one or two rooms perhaps. Compared to a central air conditioner it is more practical since the cool air is only delivered where needed, as opposed to a whole house including rooms no one ever enters. It may not be as efficient as a central AC but it more effective when it comes to cost. Size is very important to consider. A bigger or smaller unit does not mean that it's better. Size must be based on the selected location for the unit. A unit that is too small for the space will take forever to cool which means additional cost. On the other hand, a unit that's very big would be too much. You need to choose the unit that costs less to operate in the long run.

The efficiency of a window unit air conditioner is measured by EER (Energy Efficiency Ratio). By definition, EER is the ratio of the cooling capacity (in British Thermal Units per hour) to the power input (in watts). Therefore, the higher the EER, the more efficient the air conditioner is. As set by the National Appliance Standards, as of January 01, 1990, a room air conditioner must have a standard rating of 8.0 or above. Higher rating means lower energy cost. As time goes by the average EER is going up. If you buy a new air conditioner, the EER will be 10.0. So, if you will buy a unit, make sure that EER is 10.0 or higher. Check the EnergyGuide label of the unit. There are so many competitive brands in the market that have higher ratings like, LG, Samsung, Carrier and Trane. These are just some of the brands that you can find in the market. These well-known companies often make the best window air conditioners, but you need to your own research when choosing the right unit for you.

A little planning before installing a unit would be great. Mostly, this type of air conditioner is placed/ set upped in a window where it can release the warm air to the outside. But you can just place it in any window that you like; you need to consider some things. It should not be placed where it can be hit by direct sunlight. If possible, place it somewhere that has even a little bit of shade. Direct sunlight can decrease the unit's efficiency. Never place other appliances near your air conditioner, such as televisions, oven, radios or lamps These appliances emit heat. When the unit senses the heat, it will prolong the cooling process than usual.

On the other hand, if you're living in a residential area that has a tall, thin window, you can get a vertical air conditioner. It has two categories, the home unit and the freestanding industrial units. Home units are exactly like any other room air conditioner only that it's built vertically. The freestanding units are those that can stand alone and can be located in any open space. Most vertical units fit in most doorways so it easier to transport and install unlike the horizontal one.

Whatever the type - casement or portable, horizontal or vertical, window air conditioners all typically cost less to operate than bigger units. They're priced moderately and are very economical. So, if you're suffering from the uncomfortable hot weather, installing an air conditioner unit is the perfect solution. Nothing compares going home to an air conditioned house. It is the best way to beat the summer heat.