Our favorite free standing air conditioner is the Whynter 14,000 BTU Dual Hose Portable Air Conditioner (ARC-14S). This is a terrific unit that cools well, comes with a heater, and can be transported fairly easily.
These free standing or portable ac units have an advantage over window air conditioner units as they can be used in apartments which may not allow window units. These are also great for houses where the windows are not suitable for window models. Free standing ACs are movable but quite heavy and can weigh up to 80 pounds.
Free standing air conditioners are more expensive as opposed to window units as most of them do the job of removing the humidity of a room as well as cooling it.
Though portable units are more costlier but more effective in the long run. Hence,it is wiser to invest in these as these can be used all through the year because of its varied features. Portable ACs range from 6000 to 8000 BTUs. Higher BTUs are required to cool a larger room and purchasing a unit with higher BTUs will hardly any difference in the cost.
Another issue to keep in mind with portable cooling system is that these need more BTUs to cool a room compared to window models. For example to cool a space of 300 square feet, you will require a BTUs of 10000, whereas a window model will only consume 8000 BTUs for the same space. So do your research and decide what is the best free standing air conditioner.