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I turned the central air unit on for the first ...

I turned the central air unit on for the first time this year.  After a few hours, I noticed the house wasn't getting any cooler and checked for air coming out of the vents.  There wasn't anything coming out.  I pulled the air filter and noticed the inside grill and coils were nearly covered with a sheet of ice in an 80 degree house.  What would be the leading cause of this?  I use high-end filters and they're changed every 3-6 months.

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Here's a link that may help you find the answer and a sollution.

http://www.inspectapedia.com/aircond/ACCoilFrost.htm

Yeah, believe it. I'm only human.

You probably have a small leak and most of the freon has leaked out. You need to have someone find the leak and recharge the system.

Life is a one lap race. Make many pitstops.

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