Florida brick house, New AC, New insulation, tenant is hot

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Bought a property in Lakeland Florida a few months ago, had it rehabbed and added a new central AC unit. It's a 900 sqft brick house.

Tenant recently started complaining that the ac doesn't drop below 74 (for me thats pretty cold). The AC guy under warranty came to check out the AC and said all is good, went to the attic and saw insulation was low so I had another company come in this week to blow insulation R30.

A couple of days pass and the tenant talks to the PM and tells them that it's still pretty hot and that the temp was 79 until 10 PM! 

At this point I have no clue what could be going wrong. All windows have blinds. They are older style windows but that shouldn't be an issue as they were sealed.