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All About Portable Air Conditioners
How is a portable air conditioner different from central air or a window unit?
Air conditioners generally fall into four categories:
Is a portable air conditioner different from an air cooler?
Yes. An air cooler (or swamp cooler) cools air by absorbing heat through pads that are continually soaked with water. Air conditioners cool air by removing heat and sending it out of the room to some place else. Air coolers cool less effectively, affect a smaller area and add humidity to the room as the water evaporates.
Can a portable AC unit cool more than one room?
If the rooms are adjacent and there is good air flow between the two, perhaps. But they are basically designed to cool a single room.
What does a portable AC unit require?
Portable air conditioners generally require three things:
A few units also have a "boost" setting that only produces its rated cooling output when you add water to an internal tank that is used to help make the unit produce cooler air.
Can I rent a portable air conditioner instead of buy?
Rental of residential portable air units is not available. However, for large temporary installations (such as an enclosed tent or other large space) some companies do offer "portable" air conditioner rentals.
What's the vent hose?
The vent hose is essentially an exhaust hose through which hot air is removed from the room being cooled. The hose runs from the unit to some place where the warm air can be released, such as a window, another room or a drop ceiling. Keep this in mind when youíre shopping. The vent hose is typically about 5 feet long. A exhaust hose kit designed to allow you to vent the hose through a window comes with most portable air conditioners. Portable air conditioners have either a single hose or dual hose system.
What's the difference between a single-hose unit and a dual hose unit?
Where do I place the vent hose?
Many portable conditioners come with kits that can help you secure the hose in a window or ceiling area. But the kit may not work for the type of window you have. Sliding glass doors may not work with some units, for example. And crank windows are not usually suitable for vent hoses. A window screen should not interfere with the exhaust hose, as most hoses don't run outside the window, so you can usually leave the screen in place.
Read the box or check with the seller to see if you can properly vent the unit in the way you want, or if you can buy accessories that will enable you to vent it properly.
It is also a good idea to insulate the hose with insulating material because it tends to get very hot, which lets heat back into the room and reduces the effectiveness of the air conditioner.
What if the hose isnít long enough to reach the window or ceiling?
Make sure it is before you buy because itís not a good idea to lengthen the hose. It could damage the unit and it could void your warranty. The vent hose is typically about 5 feet long.
Is a portable air conditioner also a dehumidifier?
Yes, because all portable AC units take water from the air. Manufacturers usually specify how many pints (or liters) the unit can remove from the air in a 24-hour period. The higher the amount, the more the unit can dehumidify and even cool the room, but it could mean that you'll need to empty the water collection tank or drain the unit more often, unless the unit does a good job of expelling it out the exhaust hose.
Where does the water go?
Good question, and another important factor to consider before you buy. There are units that:
Most units are made so that they can be drained with a gravity hose that flows to a drain inside or outside your house. But the water must drain down. If the drain is higher than the unit, you may need a condensation pump to move the water upward. A few units do include a pump to send the water a short distance through the drain pipe.
Can I use a portable AC unit to keep my servers cool in an enclosed room?
You can, but you must have some place for the exhaust hose to release the warm air. Because most rooms housing servers do not have windows, you will want to expel the air into the ceiling, another room, or outside the building. Make sure the unit you buy comes with a kit to do this, or that you can purchase a kit that will work with the unit youíre are purchasing. Also, because server rooms generate more heat than an average room in your home, you can't use the room size estimates the same way. You should buy a portable air conditioner rated for at least double the size room as you normally would.