I had an A/S Allegiance 15 R410 complete system installed in Jan. 2008. The hot weather just hit in Houston (Mid 90's) and it is obvious 2 rooms in my house are not cooling well. The return air temp is 77 degrees and most of the outputs are around 57 degrees. The output in the 2 problem rooms is 62degrees and the supply duct comes off the top of the plenum for both rooms. Installer claims everything appears to be working fine and the R410 freon charge & pressures are fine. He called the A/S rep and he advised to open the indoor coil and check the tubes for even cooling. Installer found the upper tubes of the coil were not cooling or sweating as much as the rest of the coil . A/S Rep recommended TXV valve replacement first, complete coil replacement if TXV didn"t take care of problem.
Have any of you heard of this problem ? Are they really tackling the correct problem ?