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I have a weird condition here.

If average weather temperature outside is 30 (86 Fahrenheit) in whole day (8am - midnight), my room will be quite hot, even I set my aircon in fan 2 - 18 degree.

While, if the average temperature is around 26 (79F), my room will be cold enough in fan 1 - 24, or even 25 (77F), degree.

What could be wrong in my aircon? Usually I turn on the aircon after go back from work - going to go to work next day.

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    Loss of coolant? – keshlam Jul 30 '16 at 12:04
  • Not so sure. The aircon still breathes out cold wind, but not cold enough for my room. Is there any other possibility? – Rendy Jul 30 '16 at 13:13
  • It's a bit hard to understand this, as sometimes numbers are degrees C, and other times fan settings. Making this clearer would help us give you a good answer. – Daniel Griscom Jul 30 '16 at 13:19
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    The A/C is weak, probably due to loss of coolant or very clogged coils. – Harper - Reinstate Monica Jul 30 '16 at 16:18
  • @DanielGriscom: Sorry since here using degrees C for temperature, hope Harper's edit can make it clearer. – Rendy Jul 30 '16 at 16:24
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A non acid foaming coil cleaner on the outside condensing unit will work much better than vacuuming. If you can see light through the fins this may not be needed and a service call to fill the system may be needed. If low on freon the tech may be able to find the leak. Many times on older units the service port caps get loose and need some sealer on the threads after a recharge.

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