- A dehumidifier has both cold and hot coils. When the air is drawn into the system, it first passes over the cold coils, causing the moisture to condense and collect in a tray. Next, the air passes over hot coils, which restore it to room temperature as it is returned to the room.
- An air conditioner has only cold coils within the room. Air passes over the coils, and is propelled back into the room, removing moisture and producing cooler air. An exhaust system directs the heat outside that is produced from the cooling chemicals.
- Dehumidifiers are most useful in areas where moisture is an issue but cooler air is not desired, such as a basement. Dehumidifiers are also favorable in conditions where an exhaust outlet, such as a window, is not available.
- Air conditioners are favorable when cooling is the primary aim. Given that air conditioners reduce humidity just as well as a dehumidifier, it is never necessary to have both in a room.
- Air conditioners can be installed in rooms without a window by drilling holes through the walls and installing a system of tubing leading from the room to the outdoors.
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