No, window air conditioners are designed for window installation and need outside ventilation to expel hot air. Using one inside a room without proper ventilation would be ineffective and could be unsafe.
Window air conditioners are designed to be installed in windows for proper venting and draining, rather than placed directly on the floor where they could damage your home if not vented properly.
To determine whether a window AC will fit, open up your window as far as it will go and use a tape measure to take measurements from side-to-side and top-to-bottom. Your air conditioner packaging should indicate how large a window the unit was intended to work in and what area it can cool down.
Window AC units measure their cooling power in British Thermal Units (BTUs). Each BTU represents the amount of energy it takes to increase one pound of water by one degree Fahrenheit; therefore, having more BTUs indicates greater cooling capacity.
Window air conditioners use vents on their rear to be ducted into homes, as well as drain condensation from inside of them when draining hot air out of them. Venting this heat out of your house is vitally important, and various methods such as sheet metal or ducts that lead outside and can be closed during winter are available to do this effectively.
There are other methods available for using window air conditioning units without vents, but all have one major drawback: they simultaneously cool and heat the room. To avoid this situation, switch your unit on dehumidifier mode and place it somewhere that allows heat to escape.
One way to mitigate this problem is to use your home’s basement as an air-conditioning source; however, this may not always be feasible. Other possible solutions include placing it in the closet if possible or having vents leading out from an attic with vents; these options still require dehumidifier use and won’t guarantee effective cooling of space.
As part of their efficiency enhancement features, many new window AC units come with insulating panels inserted over their plastic adjustable sides to improve performance. This helps prevent heat or cold air from escaping the room through windows, which reduces energy efficiency significantly. Additional steps such as weather stripping will further help energy conservation efforts. Add drapes to the window area for an additional layer of insulation and cooling effect, while installing a fan to circulate air will make your room more comfortable. In addition, large furniture near an AC may obstruct its efficiency by blocking airflow.