Hello, sounds like it is either a low charge or lack of airflow, what type of filter are you using? sometimes those filters that claim to be super effecient will actually cut down on your airflow and cause the ac to freeze up.
How to Clean Central Air Conditioning Unit Coils
It is very important to clean
your central air conditioning unit coils at the beginning of the hot,
summer season. Cleaning the central air conditioning unit coils will
increase the efficiency and lower your electric bills. We depend on our
central air for cooling comfort during hot and humid weather, but if you
don't maintain the air conditioning unit, you will not have the cool
air you are expecting and you will have the electric bill you weren't
expecting.
Central Air Conditioning Unit
Instructions
Cleaning the Evaporator Coils
The foaming coil cleaner is sprayed directly on the coils, coating
the surfaces evenly and thoroughly. It's best to do this on a warm day
when the A/C will be running to help rinse the coils with condensate
water.
The spray foams nicely on the coils.
The no-rinse foam cleaner breaks down and liquifies quickly for a good rinsing action.
In minutes the foam is rinsing itself off and draining away.
Always check the PVC drain line is free of algae and unclogged. I poured
a quart of 50/50 solution of household bleach and water in the drain
pan to keep the line clear. You can also buy time-release algae tablets
to drop in the drain pan.
The access panel is reattached with the sheet metal screws. The top and bottom seams are sealed with metal foil tape.
Take care not to tape over the manufacturer's label on the access panel.
The attic air handler is now ready for another hot summer of cooling. The last task is to turn on the thermostat.The Basics
By now you know the basic parts of the attic air handler and the
importance of changing the air filter and performing routine system
maintenance. If you need to talk to your HVAC technician, you'll be able
to better follow what he's talking about.
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It sounds to me like your low on freon.Unless you have a set of gauges to check line pressures then you probably will have to call for service.I know this sounds backwards to have it freeze up due to low freon but in 35 years of experience I have found that to be the problem a lot of the time.
Sorry I can't be of more help but without knowing what the operating pressures I think you have done about all you can do. Thank you and good luck.
Leaking freon. Low charge. The size of leak could take 5 years or 5 months.
Some air conditioning companies even provide their customers with service reminders, so that they won't forget this important aspect of air conditioning ownership. Ask your A/C professional if they can do this for you, as this will help you stay on track of any work that need to be done.
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I think something similar is happening to my own HVAC system. I feel air coming out of my AC unit but it's not cool. I'll have to have a licensed professional come out to fix it. http://www.moreyphc.com/ac-and-heating-m...
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