Intended primarily for areas up to 700 sq. ft., a Portable Single-Room Air Conditioner is typically a floor-based unit on caster wheels (so it can be moved to different rooms or locations within one room). Since its removes warm air and moisture as it cools, the air has to be exhausted to another location-generally outside through an included window kit, which has a window slider and exhaust hose(s). Depending on make/model, Portable Air Conditioners range from 7,500 BTUs (for 150 sq. ft. area) up to 14.000 BTUs (for 700 sq. ft. area) with water removal accomplished by self-evaporation, gravity hose to drain, or manual emptying.