From the days of my Heat and AC course, the largest heat loss is flow through. Second is attic, third is walls and windows.
You said that you have little traffic in the house that's good. You have plenty of attic insulation that too is good. However, how much insulation do your attic ducts have? There is a tremendous amount of heat load that can be acquired from duct absorption alone and especially in ranch style homes where the runs are long and of a large diameter, there are a lot of square inches of surface area involved and have to tolerate the 140 degree or so attic temp.
You did not say that those 2x6 walls were filled with insulation and if not that's bad. That 1" of foam is just not that great.
What about your windows? Do they leak? Are they single or double pane. If single do you use drapes, especially on the W side of the house or the new on the marked sun ray blocking screens? Do you have awnings over the windows like you see on trailer houses in Florida?
Does your suction line sweat at the entrance to the condenser as I mentioned in an earlier post today? Are your filters clean?
Does your condenser sit on the W side of the house? If so do you have trees near it to shade it and provide cooler air?
How do the cooling fins look on the evaporator and condenser? Either clogged? On the condenser, what do the fins look like? Are they still straight like when it was new, or are they bent over from being hit by grass clippings or children playing?
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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