Stand alone AC blows cool air but does not cool the room

Normal ACs (non inverter) work in the following way

• The AC compressor runs continuously till set temperature is reached in the room
• The compressor then switches off, but the blower fan in the wall mounter unit keeps running. Durint this time the AC fan blows air out at Room temperature (which feels warmer)
• When temperature of room rises then compressor starts running again. During theis period the air coming out from the inner uny is cooled by the condenser coils
• And the process is repeated.... as long as you keep AC running

Ac works this way throught the operation period.
Now if you feel that your AC keeps switching off and on very frequently check the following

• Your AC may be over powered for room *for example a 1.5 ton AC installed in a scenario where 1 ton is enough)
• If there is voltage fluctuation in your area then the compressor may keep shutting don on large voltage swings
  • Solution: Get a Stabilizer
• You have set the temperature setting too high. Max temp suggested for ACs is 25 degree Celsius, any higher will mean the compressor shuts down often. Remember every compressor shutdown and startup draws a high starting current
  • Set AC temperatures between 22 and 24 degrees Celsius
• The thermostat/ Temperature sensor is faulty
  • Get unit inspected by Authorized technician
• There is dust buildup on the outer unit / compressor unit. The dust buildup may cause overheating by preventing efficient heat exchange, This may lead to overheating of compressor and it shuts down to, prevent damage to itself
  • Get unit serviced by Authorized technician
• The fan motor of the outer unit is not working properly
  • Get unit inspected by Authorized technician

Remember to get the AC serviced at least thrice a year to ensure smooth operation
Cool Thoughts... Cool Life !!!

It sounds as if warm outside air is being drawn back into the room when the unit is not actively cooling. Portable units depend on room air to carry the heat outside, & therefore will not work properly if the room is too airtight. Provide a makeup air passage by leaving the door slightly open, & see if this helps. Use a room thermometer to see if your desired temperature is being reached. Note that if the wind is strong & coming from the wrong direction, it may not be possible to prevent warm air drawback.

First, I'm not a Noma Tech.
* According to the specs. This is a 10,000 BTU stand alone air conditioner.
* Very few reviews of this model. Also it may be discontinued(?)
* Here is a chart (at bottom of web page) for recommended BTU for the room size; https://www.homedepot.com/c/air_conditioners_HT_BG_AP
* Okay, you did not give the room size, window (glazed, double pane), Roof (open or ceiling tile).
* Are there any 'heating' appliances in the same room? Oven, stove, water heater, space heater, Clothing Iron, Refrigerator, Freezer? All these appliances give off heat when operational.
* Stand alone Air Conditioners work in several modes. By itself; Removes heat by transfer to another form like water. This water needs to be removed or drained for the unit to keep working. Drying out the humidity in the air helps "cool" down by removing heat and transfer of heat through the air.
* Another mode is just to pull heat from the air and transfer this heated air to the outside using a duct or tube that exits out the room through a door or window. The exit area must be sealed or warm air will blow back into room. Openings also allow "other" sources of warm air to seep into room.
* Transfer of heat to the outside must be free of obstructions. The tube or duct must be kept short and have no sharp bends that will slow down the air flow. Also long tube runs tend to heat the air around the tube. Spilling more heat into the room. Tube should be free of leaks or holes.
* If your room is within the specified rating of you device but your still having problems then it's probably the unit.
* Final, Check your warranty and call for service.
Aloha, ukeboy57

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.

This is an old question, but I am having the same problem with APE07AHM1 that I bought second hand. I'd like to recharge it.

The answer by binev_78 seems to be for outdoor AC compressor units but this is a portable stand alone unit, no outdoor unit.

The unit may not be big enough. From the model number I am thinking you a/c is a 12000 btu. Which is usally enough for a large room. However if you have an open floor plan or a really large room you may need a bigger or second unit.

Sounds like a restriction of air flow. Check you duct work and check for holes or lose duct.

Threr are suppose to be two sounds comming from the window unit. One, the fan sound and the compressor sounds, (this compresses the refrigerants aove room temperatures (around 240*) & send it to the back coils and remove it to room temperatures and send it to the front coils which if enough freon, it will cool to at least 40*. Turn the thermostat all the way up or down while its off and see if you hear a clicking noise which tells you the thermostat is working which that what calls for cool. If it started loosing cools little by little, then you have a leak, and leaked all the freon out! If it stopped cooling all of once, then your compressor is not kicking in.

The A/C is small for the application. If there is any sun shining into the room it will add heat. If the room is open to other rooms the square footage it is cooling will multiply in proportion. Using a thermometer check the temperature of the air going into it and the temperature coming off of it out the grills. If the difference in temperature is 20°F or greater it is doing the job it was designed to do. If you shut it off when you leave and turn it on after the day heat has built up it will not seem to overcome it.