I heard on the news (I think) typical A/C units will keep the house at least 20 degrees cooler than outside. So a few questions, have you or the A/C people changed the filter, this needs to be changed at least twice a year, be sure it is installed in the correct direction. Also make sure you have the correct MERV rating. Is your controller programmed correctly, we keep our house at 78, and A/C works just fine, 5 years old this month. Did A/C people check that all the vents are open? When the A/C is operating can you go room to room and check individual registers to see if all are getting cold air, if you have one (not a return register) that is not putting out cold air see if you or A/C person can look at the duct, in case it has separated.
This is all of the ideas I have for now.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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