1. in air conditioner how water exit?
Question with many answers depending on the air conditioner setup.
If the water you speak of is the condensation from the cooled air which collects on the evaporator (cooling) coil, then there is normally a tray of some sort leading to an exit tube. This exit tube will often have a "P" trap in it to keep warm air from entering the cool side. A "P" trap can be as simple as a bend in a horizontal section of the pipe which traps enough water to block the tube completely.
The water leaving the "P" trap flows to a drain, onto the ground, or anywhere else that is convenient. It is sometimes used to wet the condensing (hot) coil thus increasing the efficiency of the refrigeration system by accelerating heat loss through evaporation on the exterior of that coil. If the water you speak of is in reference to the water which removes the heat in an air-to-water condensing unit, then the water and the heat it carries is sent to a heat sink somewhere.
That heat sink can be a cooling tower where some of the water evaporates leaving the liquid portion behind cool enough to be reused in the condensing unit. The heat sink could also be a geothermal device such as deep or shallow wells or the bottom of a local lake or pond. The ground or lake water removes the heat from the cooling water which is sent back to the condensing unit to pick up more heat.
In small systems, sometimes the cooling water is simply dumped into a drain or used as gardening water. Fresh cool water from a city supply or cistern makes up the volume which has been dumped. In all of these cases, the water exits the condensing unit in pipes.
2. My central air conditioner runs almost constantly just to keep the house at 71 degrees. Do I need freon?
It maybe that your keeping the tstat too low. This will may or not make sense. But some thermostats have a /- 3 degree temperature difference.
So lets say in your case thet the swing is on the lower side. So if your stat is set at 71 it maybe trying to call for a temp setting of 68. So, my suggestion is try setting the thermostat at 74 and see if it cycles on and off like it should.
With your vaulted ceiling and skylights your going to see probably a 10-12 degree higher temps in that room. Which is fairly common. You might also try leaving the fan set to ON to move the air in your home.
A couple of things you can do to help is make sure you outside unit is clean. Make sure you change your furnace filter with a good pleated filter. The addition of a extra return in that room will aid in getting that heat out.
But the fan has to be set to ON in order for it to preform well. And lastly by adding a power roof vent will dramatically improve the overall prefromace of the ac system. Also, if you have a mechanical thermostat, you might considering changing to a good quality digital thermostat.
Im not a huge fan of the ones lowes or homedepot sells they are too universal. But if the person knows what they are doing to some degree and can follow directions it should work just fine. I use to see this often.
And had very good results with the home owner. But I guess at what expense do you want to spend. I would try adjust the thermostat up a couple of degrees.
71 is was too low and the system will never cycle. And a dirty AC unit or evaporator will cause poor cooling issues. But as other mentioned your fighting heat load.
And if do find that leaving the fan on ON helps. You'll need to change your furnace filter more often. At least 4 times a year.
After the fist 30 days of leaving the fan on ON pull the filter and see how dirty it is. This will give you a gauge of how often you will need to change it. But 4 times should be good.
Hope this helps you and give you some ideas of what you can do
3. How much money does it waste to run central air conditioner while a window is open?
I would install one of those things that shuts the door for her.
It wil pay for itself in a few days. She is an idiot and she needs all the help she can get. Im not an AC tech, but I went to school for it.
I was actually a pilot and I have a degree in engineering, so I know what Im talking about, and so if your room mate says anything different, she is a retard. I dont care if you tell her, maybe even print this up and put it on her door. If shes cold, maybe she needs to take some Iron pills, she may have low red blood cell count, but shes still an inconsiderate POS.
She should not make everyone suffer for whatever reason she is feeling cold. She should take better care of herself. I live in Miami, its 75 degrees here and 90 percent humidity.
Its 73 degrees in my house and about 30-35 percent humidity. It feels freezing in my house and a million degrees outside. That is what humidity does to temperature.
When she lets the air come in, not only is she letting in heat, but making that heat feel so much worse. If you can come up with about 300 bucks, you can have a thermostat installed that can lower the speed of the AC fan, which reduced humidity. Or, if your landlord has to cover the AC, cover up the intake to the AC with pieces of paper.
There is the possibility it could freeze the coil into a block of ice, but if you keep an eye on it and make sure that condensate water is not backing up and ice is not building on the evaporator, it will do a great job of dehumidifying. Or, if you really dont care about anyone else in your house, get yourself a decent dehumidifier for your room and it will feel a good 10-15 degrees cooler, at your roommates expense of course.