They have an inbuilt system that regulates their operation just like an ordinary window AC unit or central cooling system.
Characteristics of the best portable air conditioner
Size: Performance of the unit is more important than its size. Bigger air conditioners consume more power and occupy more space than their smaller counterparts which are equally effective. The size of the unit is influenced by the number of heat producing equipments in the room, amount of humidity, and height of the ceiling.
Features: The best portable air conditioner has a programmable temperature control, fan speed and timer for maximum comfort and energy efficiency. The unit should be light in weight and have wheels for ease of movement. It should have a window kits for venting hot air outside the room. The unit should be self-evaporating to save you the strain of draining the bucket regularly. Moreover, the dehumidifier should be able to remove the humidity in the room without adding an icy blast.
Energy efficiency: The best portable air conditioners have high energy efficiency rating. That is, they consume less energy but have high cooling capacity hence reducing your monthly energy cost.
Other important qualities to check out for
Low fan noise: Portable air conditioners do make noise while in operation. The best units have low noise level ratings of about 50 decibels and are highly efficient.
Maintenance: The air conditioners do require constant draining of the bucket, cleaning and replacement of the filters. Hence, they should be easy to operate and maintain when necessary.
Warranty: Some of the best brands have a warranty of at least three years. It is imperative to go for the best deal for maximum utility of your unit.
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