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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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.
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.
It may be frozen over. At the front of the unit there should be an air filter. May be behind a panel that opens, or it may slide out. Behind that filter will be the indoor coil or evaporator coil. Look to see that coil and if there is any ice on it. It will be a white ice covering the coil. If it's frozen up, turn the cooling mode to off, turn the fan mode to on, and let it run at least a couple of hours to thaw. Let maint. know it's frozen up and needs service. Get what you pay for! If it's not frozen up, find some way to check the supply air temp. Some sort of a thermometer. It should have a 50-60°f supply air temp, depending on the indoor temp. Most I've seen will supply 45°f, but 50-60 is a good reference. Hope this helps! I bet it's frozen up.
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.
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.