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Air conditioner is frosting up. Air temperature outside is not below 65......in fact it is more like 75, bnut inside because of the humidity it is around 80. it is less than a year old and only ran for 3 weeks last year. Puzzled

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Frost is caused by the refrigerant pressure being too low on the low pressure side of the system. That is, the compressor has more ability than the cold coil is using up. This can be caused by insufficient air flow over the cold coil or a shortage of refrigerant.

Insufficient air flow can be caused by a dirty coil, filter, or blower wheel, or collapsed ducts, to name a few. It is most likely that some of the refrigerant has escaped and the leak needs to be repaired and the refrigerant topped up to the right amount. You'll need to use the proper gauges, a good thermometer, and read the chart that is glued inside the access door on the condenser, or...check for any available repairs that are free because of your warranty.

I did know of a Sears 5,000 BTU window air that was simply designed wrong, but that was many many years ago.

Posted on Jul 22, 2008

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WHAT IS THE MINIMUM TEMPERATURE OF COOLING


most home air conditioners go as low as 18 c but this low setting achieves nothing but a high power bill
the purpose of air conditioning ( air conditioning -- to condition the air) is to remove the humidity ( water vapour ) form the air and allow the body to perspire more freely and so is by the evaporation of the perspiration of the body water that cools the body
this evaporation is hastened by the fact that the water vapour in the air is very low due to the air conditioner operation of conditioning the air
Now knowing this fact it is obvious that all the windows and door should be kept closed ( to remove the humidity from the room /house and so a setting of 25-26 c is sufficient to keep you cool
because the temperature difference between outside air and room air is low the air conditioner cycles less frequently and costs less to run
if the room setting is at minimum and the atmospheric temp is high then the air conditioner is running virtually all the time
so instead of asking what is the minimum temp you should be asking what is the optimum temp run to be conformable and to save on power costs

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1 Answer

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Smoke or frost? More than likely frost make sure the air filter is clean and evaporator coil is clean this is a sign of low air flow across evap coil or turn fan speed up.

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1 Answer

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1 Answer

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1 Answer

My a/c unit has a energy saver mode but the machine hasn't turned off at all for the past two days and our apartment doesn't even feel like the temperature it's set to be at which is 65...


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You don't say where you are, geographically, but much to the US has an air conditioning design temperature of 95 degrees F. That means at 95 degrees, the unit will run continuously. With a 50% outside air relative humidity, it should keep the occupied space at about 75 degrees F. The more humid the air, the more the unit works on dehumidifying and less on cooling.

Give it some time, wait unti the weather breaks and see if it doesn't run just like it used to. If you chose to call a technician, have him/her take temperature readings of the condenser entering and leaving air, the suction line temperature, the liquid line temperature, the inside supply and return air temperature (dry bulb and wet bulb) as well as high and low side refrigerant pressures. Before they make ANY changes to the system (refrigerant charge) have them explain what they found wrong and make sure you understand what they are talking about. Adjusting the charge under these conditions, will mess up your operation under normal conditions.

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1 Answer

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Square footage of the studio should give the size of the air conditioner necessary to remove the moisture from the air. In order to remove the moisture the unit a/c has to operate with the coil temperature below the dew point of the air. If the air conditioner is to large for the job it will not run in the cooling mode long enough to remove moisture.

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