Front to rear condensate path open: adding that if it's not open and your AC is pretty level, it will run out the front and your carpet will get wet. BTDT
Didn't know it was clogged. Not clogged any more.
Condensate is picked by the slinger ring on the condenser fan and blown across the coils. The heat of evaporation of water is enormous and greatly aids in the efficiency of window AC units. Cooling the high pressure liquid reduces the head pressure on the compressor since pressure and temp are directly related. It takes watts of power to compress freon at high head pressures. The lower you can get it the lower the wattage required to compress a given volume of refrigerant.
What you pay for this efficiency is that the water that is slung on the condenser coil is wet and as the condenser fan blows air across the coil, any dust in the air mixes with the water and makes goo, like in the picture.
So, every year or so, depending on your situation, the unit needs to be removed and washed out as some have mentioned. If you don't clean the coils you reduce the air across the condenser which means you don't cool the high pressure freon as you should and the overall system heat goes up driving your light bill up and your cooling ability down. It's no big deal for an entrance level fixer upper. Just be careful with the coils and get the short screws back where they were. Short screws in the right places don't punch holes in refrigerant lines.
To clean the condenser effectively you need to get at the inside of the coil meaning you need to remove some sheet metal. Be extremely careful in cleaning the fins as they are very fragile and the spacings as you had when the unit was new need to be maintained (no smashed fins) to allow for proper air circulation and efficiency. Also take care to maintain the sealed system intact so that you don't open any seams and cause your freon to leak out. No freon, no cooling.
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