I have about 5 cooling my 2600 square feet. Zone cooling, and the light bill attests to the fact that if your house is setup for it (which I built mine to cool that way) it's a money saver. I use LG and Frigidaire. HD sells LG and Lowes Frigidaire. Both work fine and have been reliable with no problems over the years with either. The best part is that they buy them in bulk and in the spring and fall you can get some great prices. I can replace all of mine for less than half the cost of a central condenser unit, and that's before you add in the installation! Oh, the other thing about window units is that they all don't break simultaneously. None of this mama is on your case because she's hot!!!!!!! What's that worth?
The beautiful thing about window units is that water sump. The efficiency is up in the 11s and to get that they use the "heat of evaporation" of sump water over the condenser coils to help and get it. None of the central units that I have seen have such.
The drains are positioned such that the sump collects the water that drips off the evaporator coils during cooling (glass of iced tea sweating in the summer for the physics of it) and routes back to the condenser fan where a slinger ring on the fan picks it up and throws it onto the condenser coil where it evaporates and takes a lot of heat with it in the process.
On the LG the overflow drain is at the rear and on the Frigidaire in the center bottom.
When installing there needs to be a slight tilt to the rear to ensure that the condensate (water) from the evaporator coil (in the house) flows to the rear where it can be collected in the condenser sump. Sometimes humidity gets really low here and with little in the house and not much outside, the sump can dry up. So when that happens and I see it, I just pour some water through the vents and "fill her up". Read your installation directions for the angle.
If you get algae or mold in your sump that can clog up the evaporator drain.....really humid areas, old units, just pour in some diluted chlorine bleach and it will kill the gunk.
If you operate in a dusty, pollen saturated environment, the crud in the air will make a matt on the inside of the condenser coil as a result of the water spray. HD carries an air conditioner spray (green can, yellow cap in the plumbing dept.) that does a great job of cleaning with out having to dismantle the unit. I use it and when it gets to the point where I feel air blowing out the rear is no longer uniform across the coil, I pull the unit, open it up and clean out the crud, usually a spring chore.
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