Some apartments with fewer windows/ doors (on each wall) may need air conditioning because of the poor air flow.
The more built up the area, the less air flow through your apartment/property.
Having a corner property may mean you have ventilation on two or more sides, however a central position which backs onto another apartment may mean that the only breeze comes in through the front entrance.
Some shops and older local buildings have the same problem. If you are working in a south west facing office with no rear window, then you may need to install an air conditioning unit.
Some windows in commercial property may be non-opening, which means that unless you keep the door open there is no free flowing ventilation.
If there are opening windows, check to see if they can be locked when in the open position. Open windows let in dust, closed windows may cause other problems.
There are some newly built shops that have large window pane's with no smaller window opening to allow air to circulate naturally.
Some people may need to install air conditioning units, even if they don't like using it themselves. There are electricians who provide and install air conditioning units in your property if you require it.
If you are letting your apartment out to tourists, they may prefer to rent an apartment with air-conditioning installed. A number of owners of rental apartments have installed timer controls (brought over from UK/Europe) which will stop working after a set time, this helps stop units being left running all day when guests are out on the beach but want a cool apartment to return to. Electricity is expensive and even more so when air-conditioning is left running all day.