Air conditioners are are limited as to how much they can cool a house down.
When we had our own heat wave up here in wisconsin last month, the temp outside was 95 degrees and the coolest our central AC unit could get our house was 75. Upper 90's is about as hot as it gets here in wisconsin. The hottest day I can recall was 97 degrees on july 27, 2002.
If the air coming out of the vents is ice cold, then yours is probably working just fine.
I would blame it on the OCD part of all of us. Today I went to cousins subs for my usual lunch from them. When the cashier put my empty bag on the counter, it was kind of smashed. I couldn't stand to be there and see the bag like that so I had to straighten out all of the creases. 
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I live my life to prove wrong those who said I couldn't make it in life...