775 ft2 house with a properly sized/matched 2 ton Goodman unit in Houston. Adequate ventillation of the attic space above the living space, 5 inches of R19 blow-in insulation. Attic well sealed from living space. Northwest side facing windows all double insulated and tinted. Starting around noon and continuing until ~ 9 pm, unit will run constantly and the house temp doesn't get below 82.
I had a tech come out who checked the pressures, advises it's properly charged and running correctly, coils (both condensing outside and evap inside) clean. He did notice a kind of squealing noise on the high pressure tubing inside the house just before the evap coil. He told me that it was the result of incomplete condensing (the squealing noise was gas/liquid moving through the line that only liquid should be moving through), and that probably my outside condensing unit is too hot to do it's job. Problem is, that squealing noise occurs all the time (even when it's early morning and cool all around) so I don't think it's simply the ambient temp around the condensing unit.
So I'm stumped, as is the tech. Any suggestions?