They are definitely a more affordable choice than installing an HVAC. These air conditioners can be installed in any room, regardless of size, and provide a high energy efficiency level. It can cool a room or area without requiring a window. You will need to empty your water basin frequently on humid days. The cool and hot air are not mixed properly, resulting in hot and cool spots all over the house. This product is made for those people who can't afford air conditioners and are therefore suffering extreme heat. Instead of venting out a window, vent through a sliding-door or, in some instances, a wall or ceiling. This warm room air forces the unit's fan to work harder. The Btu rating on an AC will not be enough to remove humidity from the room if it is too high. A nice feature as I have large windows. Also, if you live an area of high humidity, you know that moisture can be just as oppressive and discomforting as heat. When looking for a portable AC to purchase, check the BTU rating on the model. When a producer creates a portable AC unit, they measure power in BTUs.