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Your windows are wet because of "dew point" google it for an explanation. Air conditioner settings are generally 21 degrees Celsius but energy saving temp setting should be around 24 degrees Celsius . I would hazard a guess you have yours set a lot lower to get condensation on your windows maybe 16 to 18 ?
Let see if I can help. The numbers don't come up so we'll just try your information.
Exhaust - should be closed when using for Air Conditioning Energy savings turns the fan off with the compressor when set for Air Conditioning Fan Only means just that (no Air Conditioning) Fan speeds Quite same as low, Norm same as medium, Super same as High Temp settings, what the thermostat senses before cycling compressor.
cold air is made by refrigeration in the air conditioner. If the unit is low on the freon charge then you have a poor exchange and poor cooling. I have gotten the units to work better by putting a little water on the outside exchange coil. by bringing the temp down on the outside coil you get a better exchange and better cooling. I used a small copper tube with about 10 real small holes in it to drizzel just a little bit of water on the outside part of the machine. the fan cools off the outside coils off and gets a better exchange bringing down the temp of the air coming out of air conditioner
A window unit is designed to have the side with the controls in the space which is to be cooled and the other side to be outside. If you simply put it on the coffe table, blowing at you, you may feel cooler for a little while, but the heat of the fan motor and compressor added to the heat from the outside coil, will raise the temperature of the room.
Best bet is to put it in a window or to have a sleeve made for a through the wall installation.
No - opening the vent will allow unconditioned outside air into the space and add to the humidity load.
Think of it like your car's A/C - when you put the controls to "Max A/C" the system recycles just the air inside the car and doesn't use any outside air. When the control is set to normal A/C, some outside (fresh) air is brought in.
The same thing is true for a window A/C unit. Keeping the vent closed will help the unit de-humidify and cool the air more quickly.