This is my 3rd or 4th post on this unit since it was installed in 2006. The first time it started freezing up was a year after installation in our new house which is 1600 sq ft. The coil in the attic unit had rusted out and needed to be replaced. We were 2 months out of warranty and had to pay all the labor costs which were pretty hefty. A few months ago, the unit froze up again. It was a clogged drainline which my husband cleared and everything was fine. Now it is freezing up again. It's not the filters or drainline. I can't understand why now. Summer heat is not nearly as bad as it was (day time temps were 84 here today) and the humidity is lower. (We live in west central Florida) The t-stat is set at 76. The strange thing is that it is freezing up after 6 in the evening. It makes it through the heat all day long and yet an hour or so before sunset, it freezes up.
So what could it be this time? I have my suspicions and they scare me.