A 5000 BTU air conditioner unit will cool up to 150 square feet, buy a less powerful unit and it will not keep you as cool. A tent has no insulation; hence the portable air con is forced to work harder.
Window ac units are popular with campers, but these coolers must be placed on a stand — I sit my unit on a milk crate. You should also buy a long 15 amp outdoor power cord. The cooling unit must not be placed near to the tent.
In fact, this unit is one of the best-selling portable cooling systems on the market. The 5000 BTU air conditioner unit is powerful enough to cool a tent and the low voltage start-up conserves energy. The free-standing ac system runs quietly, the unit weighs just 35 pounds and it has a high energy rating.