I live in an apartment in a house, and there is an old through-the-wall air conditioner. The plastic casing on the inside (front) of the AC says "Friedrich" while the metal casing outside the house says "Fedders." I believe that the outside casing may be just that, and not a part of the AC itself.
In any event, I've just removed the front cover to find the most disgustingly dirty filter that I have ever soon. Who knows when this was last changed. (This is my first summer in the apartment.)
This filter has no frame around it; it is just a "blanket" of what may be fiberglass fibers, covered in soot. I measured it to be approximately 12 x 15, but it's hard to tell because it is mis-shapen and may have stretched, since there is no border or frame. I do not know where to find the model number of this unit or how to find the correct replacement filter. Any ideas?
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There is sometimes a plastic hose between the evaporator and condenser side on the bottom of the case. Other models simply have holes in the metal for condensate to drain into the condenser side . Make sure there is no obstruction to the hose or holes. If you find none, then check the level of the unit. It MUST be slanted so the back of the unit is lower than the front.
How large a space are you hoping to cool? One room? One LARGE room? One SMALL room? One floor of a two-story house? A whole four-story house?
What's your climate like where you live? Very hot, dry, year-round? Cool most of the year but two weeks of hot during the summer? Just a little too warm in summer? Blazing hot all summer, including nighttime?
How's the insulation in the building you want to cool? Is it a plain steel building with no insulation? Is it a trailer? Is it a frame house with 4" walls and R13 fiberglass insulation? An old frame house with no insulation? An adobe building? A timberframe house with 8" of polyisocyanurate foam insulation?
All these are important to know when you select an air conditioner.
For most of the USA, assuming a frame house with 4" of fiberglass insulation, a 10,000BTU air conditioner will cool one large room or two small rooms pretty well, or a 5,000BTU AC will do one medium-sized room. Different places, and different house designs, and different types & amounts of insulation, will all have a profound effect on how much AC you need/want.
If I recall correctly, your model uses a foam type, washable filter. If that's the case, you can pickup one at just about any hardware store or home center. These are the ones that you can cut to fit, if necessary.
the humidity problem is from the condesation drain. It is more than likely to be clogged up keeping water in the condensation pan causing the humidity problem. This can be cured by a wet vac put onto the outside drain for the inside condensation pan and turned on. this removes the algae that builds up in the a/c condensation pans. Also, an a/c unit is designed to last 25 to 30 years depending on the location of the outside unit. Inside unit being an apartment, has other issues, it just may need to have some preventive maintenance done such as coil cleaned filter changed, motor oiled, etc....
I just purchased an alleged "window mount" air conditioner with the closest dimensions to the existing model. Do these mount as through the wall as well? My current opening = 18 x 26" the new purchase is 16 27/32 x 26. There are 2 different types of window air conditioners – there are the window type of which will fit in a window that opens top to bottom and there is the slide in model of which the actual air conditioner will slide into a metal sleeve which is very common in apartments. In either case you need to measure the inside of the metal sleeve and then give that to the air conditioner dealer and he will know what to do and there is also a POS (point of sale) @ the store of which will also assist you in the measurement of the A/C unit – the window unit you need to measure the opening of the window itself, I hope this was helpful