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Hi, I have an Armstrong A/C that blows cool air when the outside temperature is around 75 even up to 77. When it goes hotter then it blows just air. Is there a setting that needs to be changed in order to get cool air when outside temp is greater than 80 ? or I should get a technician to check the A/C Thanks

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It could be that the unit needs to be cleaned, it could
be that the compressor is tripping on an internal overload because the internal part of the compressor
is surrounded by high ambint air. It does not sound like a freon isssue.

Posted on Jul 06, 2010

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My ac unit will not go below 77 degrees. It quit working about 1.5 weeks ago, and I had a service technican come and look at it. He replaced the capacitor and the unit started back up and would cool to...


Hi, It sounds to me like you have covered all of the basis. The evaporator coil should be clean if you keep your filter clean and the condensation is showing that it is cooling properly. Normally, when the temperature increases outside, you will loose as much as 35% of your units efficency as it it working very hard. 77 degrees is very good temperature if the outdoor temperature is in the triple digits or a little less. It may be that your thermostat is off just a little also. If you clean your coils and keep it up like he said, that is great! I wish more people would do this. You should have a 18 to 25 degree temperature difference between the supply air from you vents and the return air at your filter. Example, if your supply air is 56 degrees, and the return air is 76 degrees, a 20 degree difference or TD, that is excellent. You can check this with a thermometer. I live in Northern Ca and it gets up to 116 degrees here in Redding!! We are lucky to have it 80 degrees in our home, no kidding!!. If you are unhappy, call this tech about it and see what he says. Your indoor coil is fine if you have no ice and I know you keep your filter clean. If you lost a capacitor again, you would have no cooling. Like I say, keep a eye on it, it could be the stat not accurate. Check the supply at the vents and filter to see what you have. If its lower then 18 degrees or higher then 25, you have a problem. If you are in the triple digits, this will cause this. I wish you the best and keep up the good work on that unit! That' great! Please keep me posted and please be kind when rating me as I know you will. Let me know the out come.
Sincerely,
Shastalaker7
A/C, Heating, & Refrigeration Contractor


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