Air cooler and air conditioner?

Because in air conditioner keeps the air at a certain condition depending on your preference. An air conditioner can both cool and heat the air.

In the humid warm climate an air conditioner is the solution. In dry hot climate and air cooler (aka evaporative cooler) works best since it cools by evaporation of water and introduces a lot of...

t where the hot air is taken in and cooled.

Not much. They do have filters, but they only catch very large particles.

The air conditioner stinks when the coils gather dust and make water (condensate) and it becomes mold. what you should do is to change your furnace filter and clean it then spray the coils down with...