I live in North Alabama and have had several techs check my a/c over the years and all have said it is doing all it can but it did not use to act this way the first two years I lived here and nothing has changed. First off, I haven't had any trees cut down and yes, I check my filter and replace it regularly. The air flow is fine and and I have no duct leaks. I have a 3 ton rheem unit on a 1970 sq. ft. home that was put in a year before I moved in house and have been here 6 years which would make the unit 7 years old. It works great when the temp. outside gets up to 92 or 93 and will hold set point or one degree above. when it gets 94-97 it will get to 2 to 3 degrees above setpoint and 97 plus 5 to 6 degrees above setpoint especially when the heat indicies are in the 100's. My house runs east to west so the morning sun only has two windows to come in by which I close the blinds and I have shade for when the sun sets on the west. On a 97 plus day it holds setpoint up tp around lunch then rises a degree almost every hour on the hour until about 7 or 7:30 pm that night then levels off and holds that temp. until about 8:30 or 9 and then it starts playing catchup the rest of the night. why does it feel warmer in the home from 4 - 8 pm . I know that is when the hottest temps are but isn't it suppose to blow about the same degree air from the supply vents all day? I had extra insulation put in last summer and can't tell a difference. One last thing that may be it, for my almost 2,000 sq. ft. home which is a ranch style home, I have only one return and it is a 20 x 25, is that too little or do you guys think I need another one on the opposite end of the house?
Thanks for any help!