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

I just bought an small medical suite. One large room does not get enough AC from the cental system and a Stand Alone AC unit was there. The unit blows cool air, but the room is still way too hot. The exit hose goes out of the building through a vent, which is clear. Hot air is being blown out the vent. I have not found a tank to collect water. Is there one? help please.

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The ACP 1400 H in the picture uses evaporative technology, it drips the water across the hot coils on the end that exhausts to the outside, and needs no tank. More about this product here

Posted on Mar 25, 2009

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Send tank capacity.model mail me [email protected]

Posted on Mar 17, 2008


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1 Answer

My NOMA NF-100 works good but not that good. It is in a small room but the temperature never goes below 89F. it was a used one and I cleaned the filter

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;
* 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

Jul 03, 2018 | Goes Motorcycles

1 Answer

Cool air when running; warm air when compressor is off.

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.

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2 Answers


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.

Jul 25, 2014 | Goodman Heating & Cooling

2 Answers

My ge ac model APE07AHM1 is not blowing cold air. What could be the problem?

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.

Aug 30, 2009 | GE APH10AA Air Conditioner

1 Answer

Danby ALSO does not cool 3 days old

Take it back where you bought it. A 12,000 BTU unit should be more than enough for a 192 square foot room, so there is some problem with the unit.

Jul 10, 2009 | Danby Portable Air Conditioner

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My LWHD1200FR AC Unit is not cooling during the

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.

Jul 05, 2009 | LG LWHD1200FR Wall/Window Air Conditioner

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No cool air some rooms: Lennox G40UH

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

Jun 30, 2009 | Goodman CKL24AR24 Air Conditioner

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AC doesn't blow cold air

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.

Jun 16, 2008 | Heating & Cooling

1 Answer

We bought a 8000btu air cond and used it last summer. It is in a room 16X20. It has never seemed to blow cold enough air and will not keepthe room cool enough. I,m wondering if there is a service depot...

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.

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