Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: does this need only one tube to vent out the window?  Do you have to empty a water pan?
Document: Though fairly quiet, I am not happy with it's cooling power, worse, I am very upset about how often I have to empty the water reservoir! The outlet tube is located at the very bottom of the unit, and impossible to empty into a large container because of that. It also leaks from the bottom of the unit. I had to get up from sleeping every hour and a half to empty the reservoir or it shuts itself off.
The description on the Sharp website lists this as a "Bucketless Design - No water tank to empty. The built-in condensate disposal system sends the water out of the exhaust hose. "WRONG, it does have a tank and it does need to be drained. The drainage procedure is listed on page 26 of the manual. We've only used this in the a/c mode, not the ion generator mode. In the a/c mode any water is suppose to go out the exhaust.
Unit is very quiet and cools well. Remote functions as advertised and the automated features such as the auto ON timer and thermostat control function properly. The window kit was troublesome to install partly because I had to use an aluminum square tube from The Home Depot in the bottom window slot to accommodate a non-standard window sill. I suspect window kits from other manufacturers would have been equally problematic.
Have had this unit for about two years.Pros:- Great cooling performance- Quiet- Easy installation- Extra features (exhaust fan mode, dehumidifier, plasmacluster ion mode)Cons:- Exhaust pipe gets warm- Uses floor space versus a window unit- Very heavy (but has wheels)
The ac unit filled up with water and now leaks. I followed the drain directions which states to attach hose and push the power twice which simply turns the unit on and off. Customer service is a JOKE! Avoid Sharp at all costs
The unit is 32.6" HIGH X 22.8" WIDE.The 2 features that appealed to me were the no water tank to drain, and the short height dimension, unfortunately both wrong. It does a fair job of cooling the room down. This was a temporary fix until we get a ductless system.
The customer support is a mess, and the A/C has a simple defect that completely renders their "Library Quiet" claim useless and false.The remote control has too many buttons and can be confusing, and if you loose the remote, you can't control the unit beyond turning it on and off. Also, Dehumidify function fills up the water tank within hours and it needs to be emptied manually.
We needed a larger portable air conditioner for our living room and that's what we got. It is quiet as advertised and cools a larger space than the space its specifications state. Couldn't be happier with the purchase.The only thing about it is the close to 100 lbs weight. Casters work well on hard surfaces and are OK for most carpeting though
To make matters worse, I'm getting no satisfaction from TigerChef, the company that sold the product. Very, very, very unhappy customer! !
This is the second Sharp portable air conditioner that I have purchased in the last two years and I really like how quiet that they actually are. When the room temperature approaches the set temperature, the unit slows down even more making even less noise than normal due to slower fan speed. This unit has never waken me up from a sound sleep and it is easy to fall asleep when it is operating, keeping my bedroom cozy, cool and comfortable all night long.
Answer: The unit usually comes with only one tube for the exhaust to the outside.  The problem is that the air that is expelled outside must be replaced inside the room which causes the air conditioner to suck air into the room even though it is closed up through any opening it can find such as under the door or through other openings around windows or walls at the mopboard.  I always purchase a second tube for the intake air from outside to replace the exhaust air so that the room can maintain a seal and allow the air conditioner to operate more efficiently instead of drawing unwanted warm air into the room to make up for the exhaust air lost to the outside.  When you read the owners information, you can see how to purchase the additional tube and fittings or you can go on-line to get it.  I also fabricated my own window insert made out of thick plexiglass for the window connection so that it doesn't look like the window has changed in appearance.  I line up the two tubes with the exhaust tube on top as hot air rises and the cooler intake air tube on the bottom.  Works perfectly!  You will have this problem with any portable air conditioner you buy, but you are lucky that this is one of the few brands that has made provision for you to connect the second intake air tube as most do not.